Blank rounds are ".303 Blank, L Mk I", and again I have several of these from '40, '41, and '43 manufacture. All are headstamped L and dated, and are not re-stamped Ball cases.
.303 Blank cases can be either long or short nosed and are ALWAYS crimped to differentiate them in the dark from Grenade rounds, which have no crimping. Oddly, this foolproof feature was not continued with 7.62mm Grenade rounds which are crimped exactly like Blank.
Colin, your Blank doesn't look like a military round. It's either a PPU commercial blank, or a reloaded and crimped "Highland" case?
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