Make sure your brass is trimmed to factory spec length.
Measure diameter of necks of loaded and fired brass and compare, the necks on the fired cases should be .005 or so larger.
Size your brass so the bolt closes with a bit of resistance, if you set the shoulder back you are creating too much headspace.
Are you getting shiny spots near the head stamp where the brass is flowing into the extractor groove?
Load data would be helpful.
Last edited by Blacktailer; 02/17/17.
