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Maybe, I can’t remember how they measured back then.
Plus you’d need to know the ball diamater (less the patch).
My .50 cal Trapper muzzle loader uses a .491 ball.
My .44 Colt Navy uses a ..451 round ball.
Yeah, I always thought it funny that the old .44s were really .45s.
I bought a box of .36 round ball to shoot in these pistols, but I don’t have calipers, so I can’t measure precisely enough to tell.
Since it’s a muzzle loader and you’re using patches, I don’t think the size is all *that* critical. As long as it’s not so tight that it won’t fire or it’s not so loose that the ball falls out.
You might get some info on thehighroad.com (I think that’s the addy) they do the b.p. threads.
Ahh… looked at the side of the box and in little print it notes that the .36 caliber ball is really .350 in diameter. So, not quite a .357.
If you can drive the patch and ball down to the powder it will shoot out. It is common to use a mallet to seat the patch and ball. It is not unknown to shoot a stuck ramrod out. Cap and ball revolvers do not use patches. To achieve a tight fit to the cylinder an over size ball is forced into the cylinder and this should leave a thin ring of lead around the cylinder as a witness mark.