The 1-48 twist is a "do all twist." Some claim they do all, but none of them very good. That is far from the truth. Normally they are excellent roundball shooters, and very good conical shooters as well. Some are even shooting sabots with some exceptional accuracy from them. The biggest thing is you have to try different things and play with powder charges, etc. But once you find what the rifle likes, they are good shooters.

My 1-48 twist when shooting roundball normally tune in around 80-90 grains of powder with a .490 ball and a .018 patch. When I shoot conicals I find a bit lighter charge of 70-80 grains gets better results. Also the addition of a bore button or wonder wad seems to help in some cases. There are some projectiles you will discover that your rifle just will not shoot, no matter what you do. All you can do is remember that and not load those again. And never underestimate the power of a roundball. They make an excellent medium to short range projectile for large game. Place that ball in the right spot and you have made a 1/2 in hole through vital organs. It don't take a doctor to know what that means...