My 1874 rifle was passed down from my great grandfather. It hasn't been shot in probably 60 years. I want to change that.
I'd like to use use IMR 4198 powder and a 240-300 grain lead bullet. Bullet diameter is where I am struggling. My bore
measures .412 and rifling goes out to .430. I have modified .348 Winchester brass to work with. It has a wall thickness
of .014. The throat diameter of my chamber - where the neck of the brass case fits - measures .453. Subtracting the
case wall thickness (.014) from .453 twice gives me .425. This figure, according to my figuring, is the max bullet diameter
I can use without the cartridge jamming in the chamber. A friend of mine suggested looking into paper patching, which I
have no experience in. I'd like advice from someone familiar with the Vetterli.