I, too, shoot H4198 in my .45-70. 32gr behind a 405gr lead FN bullet does well out to 300m, being little more than a plinking load. However, my rifle, designed to shoot lead and not jacketed bullets, is a replication of the Browning /Winchester High wall, and NOT an original. It CAN shoot nitro loads, of course, and is proofed to do so, but it is made of modern steel, not iron, like your old Winchester[s].

For a laff I also shoot Pyrodex RS - for the smoke and boom, of course - since I don't have the necessary paperwork for BP.

I, too, do a lot of shooting in the US and Canada, where are are no national/federal proof houses of any kind. Instead, the ANSI/SAAMI organisations set the standards for pressure testing for manufacturers of modern arms that may use either contemporary or historic propellants. Production arms ARE proof tested in the factory.

Older stuff?

You are on your own.

tac

sent from my raspberry @02:30PT