Buckstix - you certainly have an eye for these don't you!
Could use it with slugs in the 16g side if you need too - but only BP or is this Nitro proofed? Marvellous piece, beautifully done & kept.
Good thinking there Lancaster about the 9.3x74mm cases, at least the length will be correct if not the head stamps! Bertram Brass does make the 11.15mm brass quite a few, but not in a 65mm length!