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This page contains more detailed information on the specific manufactures of the various types of .303 cartirdges along with dates and locations if this information was available.  If you have the information please don't hesitate to contact me and I will post it and give you credit for your contribution.  The following is in alphabetical order by country and under that countries heading.

Australian Manufactures of .303 ammunition

Colonial Ammunition Co., Melbourne., Headstamp CAC Known to have produced during 1920-1921 the .303 in Cordite Mk 7 Ball and Dummy Cartridges.

Small Arms Ammunition Factory, Footscray, Melbourne. Headstamp  F^,  A^F or SAAF  This factory was known to have produced the .303 cartridge in Cordite Mk 7 Ball, Ballistite H Mk 1Z Cartridge Rifle Grenade and D Mk 6 Drill. 

Small Arms Ammunition Factory, No 1 Footscray, Melbourne Headstamp MF or AIF.This factory was known to have produced .303 cartirdges in: Armour Piercing W Mk 1; Cordite Mk 7 Ball; Cordite L Mk 5 Blank; Mk 9Z Blank; Cordite H Mk 4 Cartridge Rifle Grenade; D M 7/N; Incendiary B Mk 7; Proof Q Mk 3 and 4; Tracer G Mk2 (Australian Pattern); 

Small Arms Ammunition Factory, No 2 Footscray, Melbourne 1940-1949 Headstamp MG. This factory was known to have produced .303 cartirdges in: Cordite Mk 7 Ball and Incendiary B Mk 7.

Small Arms Ammunition Factory, No 3, Hendon Headstamp MH. This factory was known to have produced .303 cartirdges in: Cordite Mk 7 Ball; Cordite L Mk 5 Blank; Tracer G Mk 2 (Australian Pattern) and Incendiary B mk 7 

Small Arms Ammunition Factory, No 4, Hendon Headstamp MJ. This factory was known to have produced .303 cartirdges in: Cordite Mk 7 Ball

Small Arms Ammunition Factory, No 5, Rocklea Headstamp MQ. This factory was known to have produced .303 cartirdges in: Cordite Mk 7 Ball

Small Arms Ammunition Factory, No 6, Welchpool Headstamp MW

Small Arms Ammunition Factory, No 7, Salisbury Headstamp MS. This factory was known to have produced .303 cartirdges in: Cordite Mk 7 Ball and Tracer G Mk 2Z (Australian Pattern)

Belgium Manufactures of .303 ammunition

Fabrique National d'Armes de Guerre, Herstal.  Headstamp FN Known to have produced nitro-cellulose Loaded .303 cartridges in FN 8/7 Ball; Blank; Bulleted Blank; Cartridge rifle Grenade H Mk 7Z, M11 and M12; Incendiary; Tracer L83; Jacketed soft point sporting ammunition.

Canadian Manufactures of .303 ammunition

Canadian Industries Ltd, Montreal and Plattsburg, NY USA Headstamp CIL or Imperial  1955-1976 No distinction with place of manufacture according to headstamp. This factory was known to have produced180 gr jacketed soft point sporting ammunition.

Defense Industries, Brownsburg, Quebec 1886-1911 Headstamp DC.  This factory was known to have produced Gallery Practice Mk 1 (Black Powder - Canada); Gallery Practice Mk 1 (Smokeless-Canada); Gallery Practice Mk 2 (Canada).

Dominion Cartridge Co., Brownsberg, Quebec.  Headstamp D or Dominion   1911-1955 Known to have produced .303 Ball cartridges.

Dominion Arsenal, Montreal Headstamp DA.  This factory was known to have produced .303 cartridges in Cordite Mk 6 Ball and Nitro-celluolose L Canadian Mk 1 (1955 & 1956) Blank.

Dominion Arsenal, Quebec. Headstamp DAC.  THis factory was known to have produced .202 cartridges in Armour Piercing W Mk 1; Cordite Mks 6,7 Ball; Match Ball; Nitro-cellulose Mk 7Z Ball (Late Patern); Cordite Mk 5 (Canadian Patern) Blank; Nitro-cellulose L Mk 5Z (Canadian Pattern) Blank; D Mk 6 and 9 Drill; Drill D 1942 (Canadian Pattern); B Mk 7 Incendiary; Proof, Q Mk 4;  Tracer G Mks 1 and 1Z both in Canadian Pattern.

Dominion Arsenal, Lindsay, Ontario 1914-1918 Headstamps DAL or LAC.  This factory was known to have produced Mk 7 Cordite Ball in .303.        

Dominion Cartridge Company, Montreal : Headstamp DCC This later became the Dominion Ammunition Division of Canadian Industries Ltd 1911-1955.  This factory was known to have produced .303 Cartridges in: Cordite Mk 2,4,6 and 7 Ball; Nitro-cellulose Mk 7 Ball (Canadian WW! contract Patern) between1914-1916; Nitro-cellulose Mk 7Z Ball( Canadian Pattern); Drill D 1942 (Canadian Pattern) and Tracer G Mk 2Z, G mk 4Z (Canadian Pattern)

Defense Industries, Montreal Quebec Headstamp DI,  DIL, DIV(Verdun)1940-1945.  This factory was known to have produced Nitro-cellulose Mk 7Z & 8Z Ball(Canadian Pattern); Ballistite H Mk 1Z (Canadian Pattern) Cartirdge Rifle Grenade; Drill D 1942 (Canadian Pattern) and Tracer G Mk 2Z, 4Z and 6Z (Canadian Pattern)

F.W. Lamplough & Co 1903-1917 Headstamp FWL & Co.

Hingston Arms Winnapeg Manitoba 1879-1920's Headstamp HSA                   

Industries Valcartier Industies 1967-1980 Headstamp M

Quebec Aresnal Headstamp QA

Ross Rifle Co. Verdun, Quebec 1914-1919 headstamp RR or RRCO. This factory was known to have produced .303 Mk 7 Ball Cartridges in cases believed to be made by Eley.

Dominion Rubber & Munitions Trois Rivieres, Quebec Headstamp TR

Czechoslovakian Manufactures of .303 ammunition

Zbrojovka Brno, Brno. Headstamp ZV. Known to have produced Mks7 and 8Z Ball that was commercially exported by the manufacturer after 1950 to Afganistan and India.

Finish Manufactures of .303 ammunition

Valtion Patruunatehdas, Lapua. Headstamp VPT.    Known to have produced Ilmavoimat Konekivaarin Patrunna Kal 7.70 machine gun cartridges, whicha re interchangable with the .303 in Special Ball and Special Armour Piercing.

French Manufactures of .303 ammunition

Atelier de Construction de Puteaux. Headstamp APX.  Known to have produced during 1918 .303 cartridges in Armour Piercing Tracer, Ball,  It is also believed to have produced ball some time during the 1930's.

Atelier de Construction de Valence.  Headstamp A-VE  Known to have produced Ball .303 cartirdges.

Atelier de Fabrication de Vincinnes.  Headstamp A.VIS  This firm was known to have produced Ball .303 cartridges.

Cartoucherie de Valence, Headstamp VE. This factory was known to have produced the .303 Ball cartridge loaded with Nitro-cellulose.

Gevelot & Gaupillat Frers, Paris.  Headstamp GEVELOT. This factory was known to have produced .303 Ball Cartridges for export.  I have found a couple of refernces to this being a Candian produced cartridge but I believe that it was just commonly encounted there and assumed to be of Canadian Manufacture. 

Societe Francaise de Munitions, Issy-les-Moulineaux. Headstamp SFM. This factory was known to have produced .303 Ball Cartridges filled with nitro-cellulose for export prior to 1939.

German Manufactures of .303 ammunition

Deutsche Waffen Und Munitionsfabrik, Karlsruhe.  Headstamp DWM. This factory was known to have produced both ball and blank .303 cartirges.

Greek Manufactures of .303 ammunition

Greek Powder and Cartridge Co, Athens.  Headstamp is HXP This factory was known to have produced .303 Cartridges filled with nitro-cellulose powder in Ball and Blank

Indian Manufactures of .303 ammunition

Indian Government Ammunition Factory, Dum Dum, Calcutta. Headstamp D^I, D^F ,NI or SI,  This factory manufactured cartridges for use by the British Army in India as well as the Indian Army.  In 1918 this factory was capable of producing at the rate of about 10 million rounds per month.  This factory was known to have produced Cordite Mk 2, Mk 2 Special, Mk 6 and Mk 7 Ball; Short Range Practice I.P. Mk 1* Ball; Blank and Dummy Drill Mk 1. IP and IP No 2 Mk 1.   

Indian Government Ammunition Factory Kirkee(or Kirkee Arsenal) near Poona. Headstamp K^F, K^ or S. in 1918 this factory could produce about 5.4 million rounds per month. This factory was known to have produced .303 cartirdges in: Armour Piercing W Mk 1 and  1 IP; Cordite Mk 2, Mk 2 Special, Mk 6 an Mk 7 Ball; Ball SB Mk 1; Blank; Cordite H mk 3 and H Mk 5 Cartridge Rifle Grenade; Drill D Mk 6 and 7; Lachrymatory Cartridge; Observation O Mk 2 and MK 3; Tracer G Mk 1 and 2.

Ordinance Factory, Khamaria Headstamps I,K^H ot OK

Italy Manufactures of .303 ammunition

Bombrini, Parodi et Delfino, Rome.  The Headstamp AOC is used on military cartridges that were supplied to Egept between 1948-1954.  It was known to have produced nitro-cellulose cartridges in Mk7 Ball and Tracer.  The headstamp BPD was used on Nitro-cellulose loaded 7.7 X 56 R cartidges which are interchangeable with the .303 round and are known to have produced in Ball, Drill round, Incendiary Armour Piercing with Thermite filling, Incendiary Armour Piercing with Phosphorus filling, and Tracer

Pirotecnico di Bologna.  Headstamp TM..B. This firm is known to have produced 7.7 X 56R Ball and Tracer rounds which are interchangable with .303 cartridges.

Pirotecnico di Capua.  Headstamp C.. This firm is known to have produced 7.7 X 56R Blanks which are interchangable with .303 cartridges.

Societa Metallurgica Italiana, Campo Tizzoro.  Headstamp SMI.  This factory was known to have produced nitro-cellulose loaded 7.7 x56R ammunition which is interchangable with the .303 in Ball and tracer.

Japanese Manufactures of .303 ammunition

Toyokawa Naval Arsenal. Headstamp y.  This factory in known to have produced nitro-cellulose loaded Imperial Japanese Nay Year Type 92 Machine Gun Ammunition, which is interchangable with the .303 cartridge in Armour Piercing, Ball Incendiary-Phosphorus filling and Tracer. 

Yokosuka Naval Arsenal. Headstamp Yokosuka.  This factory in known to have produced nitro-cellulose loaded Imperial Japanese Nay Year Type 92 Machine Gun Ammunition, which is interchangable with the .303 cartridge in Armour Piercing, Ball Incendiary-Phosphorus filling and Tracer. 

Latvian Manufactures of .303 ammunition

Sellier & Bellot, Riga. Headstamp SBR or S&B This factory was known to have produced .303 ball and sporting Cartridges

Mexican Manufactures of .303 ammunition

Fabrica National se Munitions, Mexico City. Headstamp MEXICO. This factory was known to have produced .303 ball cartirdges.

Netherlands Manufactures of .303 ammunition

Artillerie Inrichtingen, Hembrug.  Headstamp A or AI This military arsenal become Nederland Wapen & Minitiefabrik'de Kruithoorn' NV's Hertogenbosch and later became Eurometaal.  This firm produced nitro-cellulose loaded .303 cartridges in ball, blank. Bulleted blank, line throwing blank and tracer.

Hirtenberg Patronenfabrik factory at Dordrecht.  Headstamp Do.  This factory was known to have produced .303 ball cartridges.

New Zealand Manufactures of .303 ammunition

Colonial Ammunition Co, Auckland. Headstamp CAC.  This firm was known to have produced .303 cartridges in Cordite Ball Mks 2,4,5,6 and 7; Ball Mk 6 Match; Nitro-cellulose Mk 7z Ball; Mk 6 an 6 converted Blank; Mks 3,5,5z Blank; Ballistite H Mk 1Z Cartridge Rifle Grenade; Commercial Blanks; D Mk 9 Drill; Dummy Mks 3,4; Non Regulation Dummy; Gaudet Practice; Short Range Practice(New Zealand Patern) SPorting Ammuniton(Various Grains) Mks 4 and 5 Big Game Exploder Sporting Ammunition; H.V. Exploder Sporting Ammunition.

Imperial Chemical Industries Headstamp ICIANZ

Nigerian Manufactures of .303 ammunition

Government Ordinance Factory, Lagos.  Headstamp OFN. This factory is known to have produced .303 ball cartridges.

Norway Manufactures of .303 ammunition

Raufoss Ammunisjonsfabrikker, Raufoss, Headstamp RA This factory was known to have produced .303 Cartridges in 1934

Pakistan Manufactures of .303 ammunition

Pakistan Ordinance Factory, Rawalpindi. Headstamp POF. This factory is known to have produced .303 cartridges in Ball, Blank, Grenade Launching Blank and Proof Mk 3.

Portugal Manufactures of .303 ammunition

Arsenal do Ejercito, Lisbon.  Headstamp AE This factory is known to have produced nitro-cellulose loaded 7.7 X 56 M917 ball ammo which is interchangable with the .303 cartridge.

Fabrica National de Municoes e Armas Legeiras, Moscavide.  Headstamp is FNM. This factory is known to have produced nitro-cellulose loaded 7.7 X 56R ball ammo which is interchangable with the .303 cartridge.

Rhodesia National Rifle Association. Headstamp RNRA. The factory at FNM of Moscavide was known to have produced .303 Cartridges in MK 7Z ball for the RNRA. 

South African Manufactures of .303 ammunition

Pretoria West Metal Pressings Pty., Petoria Headstamp is A (standing for Armscore) or PMP.  This factory was known to have produced 7.7x56R Ball Cartridges, which are interchangable with the .303 cartridge post 1973. It also Produced nitro-cellulose filled .303 ammunition in 174 g Full Jacket boat tail bulleted and 150 and 174 gr jacketed soft point sporting rounds.

South African Mint, Pretoria  Headstamp is U or SAM.  The U cod eused from 1939 until 1961 when it changed to SAM.  IF a U is used with a diamond this indicates that the round was manufactured ina  subsidiary factory at Kimberley.  They were known to have produced .303 cartridges in Cordite Mk 7 Ball; Jacketed soft point sporting ammunition; Semi Armour Piercing F Mk1 ; and Tracer G Mk 2.

Spanish Manufactures of .303 ammunition

Fabrica Nacional de Espana, Palencia.  Headstamp FNT.  This factory is known to have produced .303 cartridges in Mk 7Z Ball

Pirotechnico Militar de Seville.  Headstamp PS or S. This factory is known to have produced 7.7 x 56R cartidges which are interchageable with .303 cartridge in Ball and Tracer (Green Tip)

Swedish Manufactures of .303 ammunition

Norma Projectilfabrik, Amotfors.  Headstamp NORMA or norma. This factory is known to have produced .303 cartridges in Bulleted Blank and 130gr, 150gr, 180gr, amd 215 gr jacketed soft point sporting ammunition.

Turkey Manufactures of .303 ammunition

Makina ve Kimya Endustrisi, Kuruma.Headstamp is MKE. This factory is known to have produced nitro-cellulose loaded 7.7 X 56R ball ammo which is interchangable with the .303 cartridge.

United Kingdom Manufactures of .303 Ammunition

*note the ^ is the broad arrow symbol

Birmingham Metals and Muntions Co Ltd., Birmingham. Headstamps Include B,J,M, or N This company was originaly formed in 1897 and was a wholy owned subsidiary of Nobels explosive company. The company also owned another ammunition plant that was aquired in 1907 at Waltham Abbey, Essex.  Birmingham metals had ceased manufacture of ammunition by 1920 with the assets of the company being aquired in 1918 by Explosives Trades, Ltd.  which was soon renamed Nobel Indusries.  The new company had been founded to combine most of the explosive and ammunition interests of the many seperate companies operating in Britan at that time.  Nobel Industries was to become part of the new giant Imperial Chemicals Industries Ltd when it was formed in 1926.  The B in some of the mark designations should not be confused with the B by itself.  B as is BVIIZ indicates incendiary ammunition not that it was manufactured by Birmingham metals.  The types of ammo that were produced here were: Armour Piercing Mks VII.P, VII.W amd VII, Blackpowder Mk 2 Ball, Cordite Mks 2,4,5,6 and 7 Ball, Nitro-cellulose Mk 7Z Ball, Short Range Practice Ball, Bulleted Blank Mk 6, Ballistite H Mk 1 Cartridge Rifle Grenade, D Mk 6 Drill, Drill Mk 3, Premark 6 and Mk 6 Dummy, Explosive PSA Mk 2 (VILLAA), Experimental Piercing Ammunition and BIK(VILK) Mk 1 Incendiary.

Blanch & Sons of Fenchurch St, London Headstamp Blanch J.  This company made dummy rounds with a crimped base and a one piece tinplate case and bullet in 1915.

British Munitions Co. Ltd, Millwall London, Headstamp BM,  Company is believed to have manufactured only the Blackpowder Mk2 .303 Ball rounds from 1890.

Crompton Parkinson Ltd, Guiseley, Yorkshire. 1939-1945 Headstamp was CP  Although filling took place at Doncaster. This factory was set up as part of the WWII war emergency expansion plan.  Cartridges that are known to be made here between 1940 and 1944 are, the Armour Piercing W Mk 1 and Cordite Mk 7 Ball

Crompton Parkinson Ltd, Doncaster, Yorkshire. 1939-1945. Headstamp C-P. This company was already in existence but unconnected with ammunition manufacture when WWII broke out. It was selected to produce small arms ammunition as part of the war emergency expansion plans.Cartridges that are known to be made here between 1940 and 1944 are, the Armour Piercing W Mk 1 and W Mk 1 Special, Cordite Mk 7 Ball and an experimental Armour Piercing in 1942

Eley Brothers, Edmonton, London, Headstamp E.  This factory was in operation from 1828 through 1919.  During WWi they were known to produce in excess of 209 million .303 Mk 7 cartridges.   They were also known to produce the following types of ammunition in .303:  Armour piercing Mk VII.W, Cordite Mks 1,2,4,6, and 7 Ball, Nitro-cellulose Mk 7Z ball, Short Range Practice (Gaudet) Ball, Ballistite Mk 1 Cartridge Rifle Grenade, Ballistite H Mk 1Z Cartridge Rifle Grenade, Drill Mk3 and Expedient, Explosive Pomeroy Mk 1, PSA Mk 1, PSA (VII.A) Mk 1, PSA Mk2 and PSA (VII.AA) Mk 2, Incendiary BIK (VII.K) Mk  1, RL Tracer Mk 1, Tracer SPK Mk VII.T and SPG (VII.G) Mk 1Z.

Greenwood and Batley, Leeds. 1914-1958. Headstamp G & GB.They had a filling factory at Abby Wood and later during WWII was a filling factory at Farnham  with the headstamp GBF.  It is important to note that the Headstamp code G that denotes the manufacturer should not be confused with G that indicates a tracer as in GIV.  During WWI this firm produced over 705 million Mk 7 cartridges.  They were known to produce the following cartridges in .303: Blackpowder Mk2 Ball, Cordite Mks2,4,5,6 and 7 Ball, Match Ball, Nitro-cellulose Mk 7Z Ball, Bulleted Blank Mk 6, Drill Mk 6 and 9, Dummy Mk 5 and Proof OSP.

Grenfell and Accles Ltd, Perry Barr, Birmingham  Headstamp GA. This company formed in the early 1890's and aquired the Holford Works of the National Arms and Ammunition Company and was in existance for a short period of time.  They wre known to have manufactured Mk 2 Blackpowder Ball .303  cartridges from 1891 - 1896.

Government Cartridge Factory No 1, Blackheat, Staffs.,  Headstamp G18F1 or C18F1. This factory was built in 1916 and was run on behald of the govenment by Birmingham Metal and Munitions Co..  .303 cartridge porduction began in early 1918 and ended late 1918 when the factory ceased production altogether.  This foctory was known to have produced only the Nitro -cellulose Mk 7Z Ball Cartridge.

Government Cartridge Factory No 3, Blackpole Worcestershire.,  Headstamp G..F3 or C..F3. This factory was built in 1916 and was run on behald of the govenment by Kings Norton Metal Co...  .303 cartridge porduction began late in 1918  the factory ceased production altogether in early 1919.  This foctory was known to have produced only the Nitro -cellulose Mk 7Z Ball Cartridge and SPG Tracer (VIII G).

Halls Telegraph Co Burghfield. Headstamps BD  These are not likely to esist in large numbers

Imperial Chemical Industries, Kynoch factory at Standish.  Headstamp is K2 1939-1945. This factory was set up as part of the WWII emergency plans and produced its first complete .303 rounds in October 1940.  They produced .303 cartridges in W Mk1 Special Armour Piercing, Cordite Mk 7 Ball, Shot Cartridge, Tracer G Mk2,3 and 6.

Imperial Chemical Industries Kynoch factory at Yeading, Hayes, Middlesex. Headstamp K4 1939-1945 This factory was also set up as part of the WWII emergency expansion plans. Cartridge cases were being produced by late 1940 but the ball bullets were still being imported into the factory in1941.  They Produced .303 cartridges in Cordite Mk 7 Ball, Tracer G Mk 2,3,4,5 and 6.

Imperial Chemical Industries Kynoch factory at Kidderminster, Worcestershire. Headstamp K5. 1939-1945 Set up as part of the WWII emergency expansion plans. They produced .303 cartridges in W Mk1 Armour Piercing, Cordite Mk 7 Ball, Incendiary B Mk 7Z, Tracer G Mk2,3 and 6.

Kings Norton Metal Co. Headstamp KN 1890 - 1919.  The company was formed in1890 at Kings Norton.  It had its own rolling mills and had a loading plant at Abbey Wood in Kent.  Cases were made at Birmingham and sent to be loaded and assembled at Abby Wood, which was next to Woolwich Arsenal.  They were known to have produced cartridges in Armour Piercing VII.F, VII.FZ, and VII.W; Cordite Mks 2,4,5,6, and 7 Ball; Match Ball; Nitro-cellulose Mk 7Z; Blank Codite Mk 5; Bulleted Blank Mk 6; Drill Mk3 and Mk 3 expedient; Mk 5 Dummy; Explosive RTS(VII.R) Mk 2, Incendary BIK(VII.K) Mk1; Incendiary Buckingham (VII.B) and B Mk 3; Tracer SPG Mk VIIG mk 1 and Mk 1Z; Experimental RTT Explosive Cartridge; Experimental Blank Cartridges.

Kynoch & Co, Witton, Birmingham. Headstamp GKB,  K, or KYNOCH.  This firm was first formed by George Kynoch at Witton in 1862 as a manufacturer of percussion caps. It was changed to a limited company in 1884 as G. Kynoch & Co Ltd and by then was manufacturing metallic ammunition. A further reorganisation and expansion followed in 1889 when George Kynoch was ousted from the management and this then culminated in a further change of title to Kynoch Ltd in 1897. During the period ending with the 1914-18 war Kynoch, which by then was the largest of the British commercial ammunition manufacturers, owned rolling mills at Witton; at Lodge Road, Birmingham and at Eyre Street, Birmingham. At various times it had propellant factories at Arklow, County Durham, making cordite; at Warsboro Dale, Yorkshire, making blackpowder and at Kynochtown, Stanford Le Hope, Essex, making smokeless powder. In addition to these plants the original cap production was maintained at Witton. Later, effective tracer and incendiary composition operations were also carried out at Witton. After the war in 1918 Kynoch Ltd, in common with most other British small arms ammunition manufacturers, was merged into Explosives Trades Ltd, later to become Nobel Industries. In 1926 when Nobel Industries became part of the new Imperial Chemical Industries, the old Kynoch factory at Witton was retained as the ammunition centre as part of the Metal Group within ICI. The propellant interests being concentrated mainly at Ardeer within the Nobel Division of ICI. In 1962 the Metals Division of ICI was reorganised as a separate company known as Imperial Metal Industries (Kynoch) Ltd. During WW1 Kynoch produced in excess of 2,373 million .303 cartridges. The following .303 cartridges are known to have been produced by Kynoch: Armour Piercing Mks VII.S, VII.P, VII.W, W Mk 1 and W Mk 1Z; Ball, Blackpowder Mk 2; Ball, Cordite Mks 2, 4, 5, 6 and 7; Ball, Match; Ball, Nitro-cellulose Mks 7Z and 8Z; Ball, Short Range Practice; Ball, Nitro-cellulose Mk 8z with Aluminium Case; Blank, Ballistite L Mk 9Z; Blank, Blackpowder Mk 2; Blank, Cordite Mks 4 and 5; Blank, Nitro-cellulose L Mk 5Z ; Bulleted Blank, Blackpowder Mk 1; Bulleted Blank, Mk 6; Bulleted Blank, L Mk 7; Bulleted Blank, L Mk 10; Cartridge Line Thrower H Mk 2 ; Cartridge Rifle Grenade, Ballistite H Mk 1Z; Drill, D Mk 6, D Mk 8, D Mk 9 and D Mk 10; Dummy, Drill Mk 4; Greener Triplex Cartridge; Incendiary Buckingham Mk VII.B; Incendiary B Mk 3, B Mk 4Z*, B Mk 6, B Mk 6Z, ; B Mk 7 and B Mk 7Z ; Practice Tracer PG Mk 1; Proof Q Mk 3; Tracer, Self Destroying; Tracer Mk VII.G, G Mk 1, G Mk 2, G Mk 2Z, G Mk 3, ; Tracer G Mk 3Z, G Mk 4, G Mk 5, G Mk 6, G Mk 6Z,; G Mk 7, G Mk 8 and G Mk 8Z; Triple Ball Experimental (1918); 180 gr Jacketed soft point sporting ammunition; Streamlined Pattern 1927 Match Cartridge; Streamlined Pattern 1936-37 Match Cartridge; Streamlined Pattern 1947 Match Cartridge; Bulleted blanks for Bren, Lewis and Vickers; French Drill Cartridge; Experimental armour piercing; Experimental semi-armour piercing; Experimental armour piercing tracer; Experimental armour piercing incendiary (1956); Experimental tank piercing (1940); Experimental Tracers; Experimental Observation; Experimental Bulleted Blanks

Lorenz Ammunition and Ordinance Company, Millwall, London. Headstamp L.  Known to exist .303 cartridges in Mk 2, Black powder from 1887 and 1890.  Cartridges are often confused with the Ludlow Co who has the same headstamp and operated during the same time period and produced the same cartridge. 

Ludlow and Co, Wolverhampton, Staffs. Headstamp L.  Known to exist .303 cartridges in Mk 2, Black powder from 1887 and 1890.  Cartridges are often confused with the Lorenz Co who has the same headstamp and operated during the same time period and produced the same cartridge. 

Maxim Arms Co., London, Headstamp MAXIM.  The cases were made by BSA for Maxim machine guns in the 1890's and .303s were produced as Cordite Mk2 ball only.

Nobel Explosives Ltd, Manchester. Headstamp M.  Known to have produced .303 cartridges from 1914-1918 in Cordite Mk 7 Ball and PSA Mk 2 Explosive.

Raleigh Cycle Co, Nottingham. Headstamp RC or RH Know to have produced .303 cartridges 1941-1945 in Cordite Mk 7 Ball.

Richard Threlfall and Sons. Headstamp RTS.  Only explosive ant-zeplin cartridges.

Royal Ordnance Factory, Blackpole, Worchester.Headstamps include B^E or BE    This factory was part of the WWII was emergency expansion plan and was situated at Blackpole on the site of the earlier Government Cartridge Factory No 3 of 1916. Initially ICI Ltd were to have operated this plant but they were advised in 1940 of the change in plans and the factory was run as a Royal Ordinance Factory by the Ministry of Supply. This factory made and marked cases but filling was carried out at the Royal Ordinance Factory Swynnerton Staffs.  Cartridges produced at Blackpole from 1941 to 1945 were, Cordite Mk7 Ball, Ballistite H Mk 1 Z Cartridge Rifle Grenade, U Mk 5 Dummy, B Mk 6Z and B Mk 7Z Incendiary, and G Mks 2,3 and 4 Tracer.

Royal Ordinance Factory, Hirwaun, South Wales.Headstamp H^N. 1939-1945. This factory was set up as part of the WWII war emergency expansion plan. IT was involved in the production of .303 cartridges in only a very limited way, and was known to produce only the Tracer G Mk 2(in cases dated 1943 and 1944)

Royal Ordinance Factory, Radway Green, Cheshire.  Headstamp RG or ^ 1939-1973  This factory was part of the WWII emergency expansion plan being situated near Crewe and is still in operation. Production of the .303 cartridge commenced in 1940 and the last known production of this cartridge was in 1973 with Mk7Z Ball and Dummy Drill cartridges. Initial Radway Green production used a single arrow as the head stamp code and this was replaced in 1942 by the RG code.   They were known to have produced the .303 cartridges in the following: Armour Piercing W Mk 1, W Mk 1 Special and W Mk 1Z, Cordite Mk 7 Ball, Nitro-cellulose Mks 7Z and 8Z Ball; Ballistite L Mk 9Z Blank; Cordite L Mk 5 Blank; Nitro-cellulose L Mk 5Z; Nitro-cellulose L Mk 10Z Bulleted Blank; Cordite H Mk 2, 4 and 4z Cartridge Rifle Grenade; D Mk 10 Drill;  Dummy Drill 1973 Pattern; U Mk 5 Dummy; Incendiary B Mk 6, 6Z, 7 and 7Z,; Q Mk 3 Proof; Tracer G Mk 2 and 8.

Royal Ordinance Factory, Spennymoor, Durham.Headstamps SR or ^^ 1939-1945 This factory was part of the WWII emergency expansion plan. It began production of .303 ammunition in 1941 initially with the head stamp code of two arrows replacing these in 1942 with the code SR. The Spennymoor ammunition was filled at the Royal Ordinance Factory, Aycliffe, Durham. They were known to produce th .303 cartridge in Ball Mk 7 and 8Z, Blank L Mk 5 and Incendiary B Mk 6, B Mk 6Z, B Mk 7 and B Mk 7Z

Royal Ordinance Factory, Steaton Headstamp ST

Royal Ordinance Factory, Swynnerton Headstamp SWN stamp after March 1, 1946

Royal Ordinance Facotry, Thorpe Arch, Boston Spa Headstamp TH

Royal Laboratory, Woolwich Arsenal, Kent. 1670- 1957 Headstamp R^L. Woolwich Arsenal of which the Royal Laboratory was only a part, is situated in South East London on the River Thames. The Arsenal dates from 1670 and has manufactured many different items of warlike stores for the armed forces. Ammunition was made at Woolwich long before the adoption of the .303 cartridge in 1889. Ammunition production ceased completely at Woolwich in 1957, the last known production of .303 ammunition there being Mk 7 Ball. The Woolwich site apart from containing all the supportive facilities for the research, design, development, inspection and testing of ammunition also included an extensive range complex on the Plumpstead Marches. In addition there was a filling area nearby in the vicinity of Abby Wood.They were known to have produced the the following .303 cartridges sice the adoption of the .303:  Rmour Piercing Mks VII.S,P,PZ,W,WZ and W Mk 1; W mk 1 Special and W Mk 1Z;  Blackpowder Mks 1 and 2 Ball; Cordite Mks 1,2,2*,3,4,5,6 and 7 Ball; Match Ball; Mitro-cellulose Mks 7z, 8z & 7z RC(reduced charge) Ball; Short Range Practice Cordite Mks 1,2,3 and 4 Ball; Short Range Practice (Gaudet) Ball; Blackpowder Mks 2 and 3 Blank; Cordite Mks 2,3,4,5 Blank; Cordite Mks 1,6 Bulleted Blank; COrdite L Mk 5 Blank;  L MK 7 and L Mk 10Z Bulleted Blank; Cordite Mks 1 and 2 Cartridge Rifle Grenade; Cordite H Mk 2 Cartridge Rifle Grenade; Ballistite H Mk 1Z Cartridge Rifle Grenade; Blackpowder E Mk 1T Cartridge Discharger; Magazine Rifle Mk 1 and 2 Drill; Drill D Mk 6,6*,7,8 and 9; U Mk 5 Dummy; Dummy Drill Mks 3,4,5,6; Dummy Version of Explosive R Mk 3*; Inspectors Dummy Mk1,2,3,4 and 5; Explosive R Mk 1,2,3,3*; Incendiary Buckingham (VII.B) B Mks 1,2Z, 4,5,6,6Z and 7; Instructional Mk 6; Cordite Mk 1 Machine Gun Blank; Machine Gun Dummy Mks 1 and 2; Observing O Mk 1; Cordite Proof Mk 1, Mk 2, Mk 3, Q Mk 3, Q Mk 4, and Q Mk 5.  Shot Cartridges; RL Tracer Mk 1; Tracer SPK(VII.t) and  SPK(VII.TZ);  Tracer SPG(VII.G) Mk1 and SPG (VII.G) Mk 1 Z; Tracer G Mk 1, G MK 1 Special, G Mk 2, G Mk 3 and G  Mk 4;   and the following experimental rounds: Steel Anti Foulin Bulleted Rounds, Armour Piercing Tracer(1917-1918), Armour Piercing Cartridges, bulleted blanks, Explosive, RTS and RTT Cartridges, Grenade Launcing Cartridges and Lachrymatory Cartridges.

Rudge Whitworth Cycles, Nottingham  Headstamp R..W. 1915-1918  This company is the only new commercial ammunition manufacture put into business by the government as a result of demand in the Great War.  They recieved thier first contract for the supply of MK 7 Ball ammunition in 1915 and continued to produce this untiol the end of 1918  at their new factory at Tyseley.  Ther were know to have produced the .303 cartridges form 1915 - 1918 in the following: Cordite Mk 7 Ball, Drill Mk 5 Dummy; Incendiary Buckingham(Vii.B), B Mk 1, B Mk 2Z and Tracer SPG(VII.G) Mk 1Z.

T. Bland & Sons, London.  Headstamp T.BLAND & SONS.  This firm loaded commercial .303 cartirdges in ball and sporting configurations.

United States Manufacturers of .303 ammunition

Federal Cartridge Co,. Anoka Minn., Headstamp is FC. This factory was known to have produced the .303 cartridge loaded with Nitro-cellulose in 180 gr and 150 gr soft point hunting ammunition.

Hornady Headstamp Hornady.This factory was known to have produced .303 Cartridges using the Custom brad with nitro-cellulos loaded 150 gr Spire Soft nose  and 174 gr Round Soft nosed sproting cartridges.

Peters Cartridge Company, Kings Mill, Ohio Headstamo P or PC

Remington Arms Co., Inc., Bridgeport, Conn. Headstamp RA. This factory is known to have produced .303 cartridges filled with Nitro-cellulose using an American WWI Contract Pettern and these were produced from 1914-1917 as Mk 7 Ball. With the R-P headstamp was known to have produced 180 & 215gr jacketed sof tpoint sporting ammunition.

United States Cartiridge Co., Lowell, Mass. Headstamp US. This factory was known to have produced the .303 Ball Mk 7 cartridge loaded with Nitro-cellulose, during 1914-1917. 

Western Cartridge Co., East Alton, Ill.  Headstamp WCC. This factory was known to have produced the .303 Ball Mk 7 cartridge loaded with Nitro-cellulose (American WWS Contract Pattern)

Winchester Repeating Arms Co. New Haven, Conn. Headstamp W or WRA. This factory was known to have produced the .303 Ball Mk 7 cartridge loaded with Nitro-cellulose for military contracts from 1914-1917. Along with Mk7Z Ball(american WW2 Contract Pattern), Scott multiball (duplex) cartridge and 180 gr jacketed soft point sporting ammunition.

Winchester Western Division of Olin Industries, New Haven, Conn Headstamp W-W. This factory was known to have produced the .303  cartridge loaded with Nitro-cellulose in 180 gr Jacketed soft point sporting ammunition.

West German Manufactures of .303 ammunition

Maschinenfabrik Elisenhutte, Nassau.  Headstamp MEN. This is now known as Metallwerk Elisenhutte GmbH Nassau.This factory was known to have produced .303 cartirdges during 1988.

Yugoslavian Manufactures of .303 ammunition

Prvi Partizan, Titov Uzice. Headstamp PP or nny. This factory is known to have produced .303 cartridges in Ball Mk7, 7Z, 8 and 8Z

Sources for the above information comes from a variety of sources including the following
Skennerton's Lee Enfield Story
Stratton's  British Enfield Rifles
.303british.com
Harrington Museum in the UK
Various Museum Litterature from the UK
Various Government & Manufacture Documents