I'm working up a load for my 243. I have all new brass (lapua). Should I 1x fire the brass before I try to do load work up, or can I work up loads with new brass and have it be repeatable. thanks
I try to use new brass for that, but if you have a bunch of once or twice fired laying around i don't see any reason not to use it, you'll be loading it with whatever load you figure out anyways.