I have a .45 bbl I want post for trade in the classifieds, but other than a preference for .32, Don't know what to ask for in the way of twist. I'll be using more or less 50 gr. rb, or 65 gr conicals. What twist will shoot better at say, 50 yds? I'm wanting to build a flinter, if that matters. If I have to settle for .36, w/rb, would the twist factors be different?