Most have a round ball twist of about 1 in 72. Some shoot the old style minie well. None of the four I have owned did. All shot the 575494 semiwadcutter with light charges (50 gr). My best load, winning the 50 yard championship at Friendship and setting a new record in '70, I think (year), was 70 grains of fffg DuPont, .570 ball, pillow ticking patch with moose milk and a .070 20 ga wad between powder and bullet. Was a great hunting load and I even shot it in a few bench matches (using redfield aperture sights). This was with a Numrich NSSA approved 7 groove barrel and a Century Arms replica. I have an "original" first generation replica now, a Hy Hunter with "Remington" stamped on the lock plate, and the correct taper bored, choked barrel. Made in about 1964 and it shoots Minies very well.