A couple of years ago, i bought 300 pre primed Rmington.303 Brit cases in anticipation of starting reloading. naturally life got in the way and it never happened. so NOW i think i can get to it. I have a bunch of 180grain Sierra .310 flat based bullets to use. However the neck of the case is way too narrow for the bullet. Bear in mind i haven't started reloading yet, so this is an entirely noobish question, but what do i use to expand the neck to fit the bullets?
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