Drew,
It is a little bit chicken and egg.
British guns marked STD were generally made for lead, if they were made for steel they would be marked with the Fleur de Lys mark.
British cartridge manufacturers load “standard steel” cartridges intended to be safe in good condition Nitro (STD) Proofed guns of the right chamber length and subject to recommended limits on shot size and chokes.
Eley have introduced a 2 1/2” 12-bore Grand Prix Traditional Pro Eco with a biodegradable wad and 30g steel No.4 suitable for use in those guns.
I have been told that it is not a good idea to use steel cartridges shorter than the chamber length of the gun, for fear that the jump at the case mouth could allow steel pellets to emerge through the protective wad.
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