Free: Contests & Raffles.
It can be hard to make a cloth patched round ball make the jump from a case mouth to the rifling. a paper patched bullet can do it because the paper patch is srunk fit to the bullet. Odds are the ball will get blown out of the cloth patch. If your ball was the same size as the groove diameter you can do it with no patching. I shoot 378 RB's in my 375 Win.
#AWS, I think he is looking at using the bullets from his Vetterli (cartridge rifle), that I am guessing he reloads for, in his muzzleloading rifle that has a slightly larger bore than the Vetterli. Hence, he would need thicker patches than what he uses for a wider roundball. I could be wrong, thought I was once, but I was mistaken.....