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I have my die set to move the shoulder back 0.002" during sizing (FL die). Should I scrap that die and buy a NS die?
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Try this test: Fire a factory load in your rifle. Carefully extract the case about half way. Push the case (via the bolt, with the extractor still in contact with the case), back into the chamber and turn the bolt down until it locks. Did the case re-enter the chamber without difficulty? If it did, then why are you setting the shoulder back .002? The only reason to set the shoulder back is to get the hand loaded round to chamber...if it chambers, there is no reason to set the shoulder back. On a rimmed, semi-rimmed case, only the first time the case is fired it head spaces off the rim. After that, it should be treated as if it rimless (head space off the shoulder). If you continue to use the rim for head space by setting the shoulder back, you invite premature head separation.