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Britain made little use of the M1 carbine during WW2 although it was issued to a limited extent in the Far East towards the end of the war,. What ammunition was supplied was standard American brass cased ball.
By the early 1950s however, Britain was engaged in the Malayan Emergency and the M1 Carbine became more widely issued for jungle fighting. American supplied ammunition was running out and so Britain manufactured new ball rounds.
.30 inch Carbine Ball 1z
"Cartridge S.A. Ball .30 inch Carbine Mark 1z" was approved for Land service in September 1954 and shown in Lists of Changes Paragraph C.6737 dated August 1955.
The case was rimless straight tapered with a Berdan primer with .35 grains of cap composition. The headstamp included the Mark numeral "1" but despite having a nitro-cellulose propellant the headstamp did not usually include the code "Z". The primer annulus was purple.
The bullet was round nosed with either a gilding metal or GMCS envelope and a lead/antimony core. It was flat based with no cennelure and weighed 112 grains. It was secured in the case by three stab crimps.
The propellant was 13 grains of nitro-cellulose powder.
Muzzle velocity was 1,900 fps at a pressure of 15.75 tsi.
Blank
A blank was also manufactured but it is uncertain whether this was ever approved for service
The case was that of the ball round, but closed with a short rosette crimp. It was headstamped as for the ball round but without the purple primer annulus.
No futher details are known regarding propellant load
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