I would like to get your opinion as to the diameter of a bullet that I need for my Lancaster 450/400 double rifle. The rifle has a typical Lancaster oval bore with the minimum bore diameter = 0.405" and the maximum = 0.418".
I believe the appropriate cartridge combination is a soft lead 270 gr PP bullet, sized to .405" and 110 gr BP.
I shot the rifle a long tome ago with PP bullets (bullets = 0.395") with 2F and wasn't satisfied with the results. Also I don't like paper patching and want to try a cast bullets.
I know that a 20-1 cast bullet will not upset like a pure lead PP bullet. My concern with a 0.405" cast bullet is that it would not grip the "rifling" (spiral oval) and that there would be gas blow by.
I can make a 0.418" bullet by swaging 44 mag bullets down. I don't know whether a 0.418" bullet would be that accurate; it seems like a lot to squish down.
What are your thoughts?
