Re: .270 win. flat primers. high pressure???
Mr/ Gibbs is almost certainly correct, it's headspace, not pressure.
Headspace is, or should be, a non-issue for reloaders. Simply back the sizer die up until the cartridge actually fits the chamber at the shoulder and you're done. Some call that "partial FL resizing" but it's a poor term, "partial" anything only means incomplete but undefined. I call it "custom resizing", that means it's specifically sized to fit MY rifle correctly.
Or, as Gibbs suggests, do neck sizing.
Last edited by boomtube; 06-09-2010 at 01:24 PM.