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Don't follow rcbs instructions that say cam over, that's wrong. Use a headspace guage on a caliper, measure some fired brass. Get an average and set sizing die up to only bump 2 thou from fired. Before you load throw a few in the chamber and make sure it's bumped back enough, and adjust as needed.
Sounds like another rabbit hole that I'm going to need to explore
it's super ez, learn what/where a datum line is(Lee manual has it in the specs, I believe, but only use it as a reference), measure fired brass from base to datum line using the correct collect in the headspace guage in a caliper, get an average of fire brass, start with die loose, too long not bumping, run it down on a fired case, in 1/8 or less turns run die down till it bumps shoulder back 2 thou. you need to tighten the die in-between each test. It's a pain but only done once if done correctly.
Since the seater die is in there as well. If I seat a bullet in the case that's been resized, and come out with the same dimension as what they wrote down, that should mean the resize die is correct for the load right? How much the shoulder being bumped would be unknown until I get some gauges
True but 9.5x out of 10 it's fine. I've never had to worry about it in anything I load for, belted or not. Am sure there's rifle chambers out there it might be an issue with, but let's not confuse this guy more, he can cross that bridge if needed later in the rare case that's an issue.
My headspace inserts are numbered by the orfis size, that's looks like a "E" insert and length. Find out the brand and opening size for your info. But really you should take fired brass and work it yourself.
memtb
