Rocketman,
I don't understand why shortening the hull would increase pressure, either. I was working up loads for a friend's 2 7/8" 10 gauge and ran across a disclaimer that you can't put loads designed for longer hull in a shortened hull without adverse pressures. Based on my logic, shortening the hull and using roll crimps shouldn't apply, but I'm no ballistician. Can't defend the position, just put it in there to see if one of the "best and brighest" on this website could/would show me the light and the way.
