1minute,
Not meaning to butt in here.
I have loaded the 45/90 for a few years and even with Swiss powders, I find a little compression is ok. My target loads get about 0.100" compression with the Lyman Postel 535 gr. bullet when cast 20:1. This load will produce +-8" groups at 600 yards, on a good day, from a rifle with a 18" twist barrel. I use Starline cases, mostly.
Jim
