Welcome from Ohio. Most likely the barrel rifling twist is 1-48" which means it will shoot slugs/bullets ok, and patched round balls ok. This is a compromise twist as a good round ball barrel would be 1-60" to 1-70" and good bullet/sabot barrel will be 1-28". I shoot 90 grs 3f black powder in my 50 cal. If my memory serves me, someone will surely correct me, you move the rear sight in the direction of the holes. Move the rear sight up and to the left to get the bullets to strike lower/right. Guys is this correct?