A 20 twist barrel will shoot Hornady PA Conicals !! At least, this one will.
Still shooting, but at 50 yards its paper-punching perfectly clean holes through the cardboard like a wadcutter. My daughter's first ever flintlock shots #1 and #2 went through 1 3/4" apart !!! We're just moving the POI to meet the POA and this girl's goin' huntin' with Daddy !!!
Forgot to add that I just started out by tossing the same 80 grain charge in the 20 twist gun as I do in my Mountain Rifle... and that's the only charge weight I had to try !! Recoil is VERY gentle for a little gun.