I would say he hit it on the head about the head space also. Like said back the die off until the bolt will just close with one finger for proper headspace or at least thats my gauge. You may possibly once again loose some accuracy by fl sizing even if you do back it off because it is still sizing the body a little. For a bolt gun neck sizing is usually the way to go for best accuracy because the shoulder doesn't get blown out during extraction like in a semi and the case body is a perfect fit to the chamber. Happy testing :).
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