The size of the bullet and the thickness of the paper must be matched to the type of throating in the rifle and intended application. Many things will work. Some better than others, but there is no gospel.
As this is a hunting rifle, I would be looking closely at the throat and hoping to see a fairly gradual taper. A casting of the throat would help immensely.
With a tapered throat, I would make bullets that are about the land diameter, and then patch them to about groove diameter or a bit less, then seat deep enough to seat just off the lands when the barrel is fouled. Fouling control is everything here. Use a grease cookie and quality lube made for blackpowder.
Paper can be cotton rag, partial cotton rag, or whatever. That is not really important. Finding the right paper to match bullet with bore is difficult. It is often easier to find the paper and then have the bullet mould cut to match the paper/bore combination.
Brent
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