Yes i think so.. But most BP and BPC guns that I see for long range have a 1:18 twist , like the Pedersoli Gibbs for example. Some have a 1:20 but the concensus seems to be that a 1:18 is better for long range . I thought that Green Mountain made a 1:18 at one time. I know the bpc barrel they make for the 45/70 is a 1:18 I think a breech plug could be installed on it instead of a cartridge chamber couldn't it?