Good comments, Hummer70.
I've seen a few LC 7.62 match cases ruptured at the pressure ring and after some investigation, both were caused by the reloader's full length sizing die setting the fired case shoulder back too far. He got an RCBS Precision Mic and reset his die for shoulder setback of no more than 2 thousandths instead of the 5 to 6 thousandths his die setting produced.
It's my opinion that either M118 or M852 cases will have head separations when case headspace is way too short for the chamber and they're full length sized too often. Knurling on the M852 cases will probably cause shorter case life in a controlled test; same chamber, sizing die, same excessive shoulder setback and same cases used.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
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Last edited by Bart B.; February 14, 2013 at 12:03 PM.