Originally Posted by
TXGunNut
Agreed, the Greenhill Formula is far from an absolute but the guy who came up with it was a lot smarter than I am. I think if he were around today he could whip out his slide rule and come up with the correct factor to use for our boolits. Seems to me I used 120 or 125 but my head hurts to think about it so I won't.
Herbert has a good point as well, I converted a T/C percussion rifle from 45 cal to 54. My research told me to go with a very slow twist if I wanted to shoot balls and I did, so I did. That was before I started pouring lead. Just occurred to me that I might be able to have a little fun with that original barrel if I could find the right mould.....