Lloyd3,
You mentioned Hammer Drillings, saying "all seem to have the bigger 9.3x74R rifle cartridge", while the 9.3x74R is one of the world's great cartridges I think you will find that more of the old hammer drillings are 9.3x72R instead of 9.3x74R. While older, the 9.3x72R is also a great cartridge in the class of 38-55 or 35 Remington, whereas the 9.3x74R is in the class of the 375 H&H Magnum Flanged. I find both 22Magnum and 22LR useful in the righthand shot barrels of my drillings (can use the set trigger and automatic rifle sight). I do find a scope essential for my use, however.
Mike