Primer piercing-
What primers are you using for near max loads? There are some to avoid. Use thick cup primers such as Rem 7 1/2, CCI 450's.
Verify headspace and case sizing. This is critical.
Set firing pin protrusion to .035"-.045" not .060". Use light oil, NOT grease on pin otherwise light strikes and misfires can occur in colder weather.
Any bolt head work is a last resort.
Shouldn't be piercing primers without an ejector wipe and a heavy bolt lift.
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