RD57
Well-Known Member
I don't trim new brass unless they exceed the max OAL. After two firings they usually need to be trimmed, and I only take them down .003"- .005" below max. On my overbore cartridges (220 Swift) I trim to max length, let the brass take the heat during firing and not the chamber/throat juncture. I don't mind trimming after every resizing operation if required, it's just part of doing business.