Re: question on wad or bore button
There is a geometrical problem with using a wad between the powder and a PRB. A bore diameter wad like a felt wonder wad, is flat. When compressed down against the powder by a patched round ball, the wad curves to the diameter of the ball. When the powder ignites and the pressure is forced against the ball, it is still curved, this time under much more pressure. The problem as I see it, is that a bore diameter wad curved up against a patched round ball , loses a third of it's diameter, leaving a ring around the wad where the patch is exposed to the burning powder. Some folks swear it helps seal the bore, gives higher velocity, and cures other muzzleloading aches and pains. From a strict junior highschool geometry point of view (circumference equals 3.1417 x diameter) the wad when pressed against the curvature of the ball, just plain can't seal the bore. This seems to be an idea that stems from the days when flat based bullets were first used in muzzleloaders and a wad was necessary to seal the bore andd keep the powder from melting the lead bullet (that was not sealed or protected by the patch like a round ball)
For that reason, I have never used a wad over the powder when shooting a PRB.