I have a 45 cal barrel that came off a Sharps rifle of some brand or another. It's a 20 twist 1 1/8" x 1" that can be 30" long. I'm thinking that I could build a plains style muzzle loader out of it. I know for a fact that a 14" twist 375 Whelen will shoot round balls with surprisingly good accuracy at 25 yds or more. A patched 445 ball is a very good fit in the barrel I have and should shoot pretty well but I don't know how fast. The other thought is that with the right size bullet like a minie ball or one of Lee's REAL bullets it would make a very powerful big game rifle and a round ball could be used for plinking and practice. It would be a fun project and something for me to do but would it work?