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Many of the most accurate shooters will full-length size with a shoulder bump of only about 2thou.
This achieves the benefits of neck sizing only, in that the brass fits the chamber pretty much perfectly, with the added reliability of a tiny bump in headspace to ensure it always chambers properly.
The only way that im aware of to set this up really accurately is with headspace comparitors. 1/24 of a turn on the die is enough to put you in and out of "the zone" if you are going for only a 2thou bump in headspace.
How I set up the full-length die is by.
1. Measure the headspace of a fired case.
2. Full length size the fired case and then measure its headspace again.
3. Adjust the Die to be closer to the 2thou only bump we are aiming for.
4. Full length size another fired case, and measure again.
5. Repeat till its only bumping headspace by 2thou.
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