There are several designs of .303" blank cartridges for training purposes which were also belted for use with the Vickers Machine Gun which also used a bulleted blank with soft wood bullets. All of course for training purposes - As to usage, well many survive to this day.
For Rifle Grenades they used a stronger Ballistite Round called "Cartridge S.A. .303 inch Rifle Grenade 30 Grains Ballistite Mark I" which was half stained black for identification.
The use of Roman Numerals with .303" ammunition persisted into the 1960's!
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