I have Hornady Match Grade dies and seater. The sizing die FL sizes and allows you to change the neck tension by inserting different bushings. The seating die has a micrometer. For a chosen COAL, it seems that I have to back off the micrometer a bit and "walk it in" to get the correct COAL otherwise I end up with some rounds with shorter lengths. Any idea what is causing this - bullet tolerances, maybe an issue with cases not uniformly sized, irregular neck tension?
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