Hal,

I would guess that muzzle loader guns with cylinder bores would be least affected IF the soft surface layer (whatever it actually is) is thick/tough enough. Still, I would wonder how essential a thick plastic wad would be to prevent damage to the soft metal of the barrels.

So much hype, so few independently verified facts.

I have never seen any reports about damage, or lack thereof, to recessed chokes from use of steel shot or HeviShot. Are there such reports?

Niklas