The Firing Line Forums - View Single Post - Follow-up ? on Lake City Brass

Bart B. · February 14, 2013, 11:43 AM

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.

February 14, 2013, 11:43 AM	#4
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	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. Last edited by Bart B.; February 14, 2013 at 12:03 PM.