I have a REM700 BDL rechambered in .308, up from .270. I've probably shot close to 400 rounds since I picked up the rifle from the gunsmith. I don't know a lot of the technical details that I should probably know but was hoping that someone could help me figure out what is going on. I've been shooting three different loads, only the brass changes while all other components stay the same. The three different types of brass are Lapua, Winchester, and LC (once fired, remanufactured military brass). The load is 175smk, 42.8gr Varget, Federal 210 primers, 2.810" OAL. The problem that I'm experiencing is with the LC brass, I'm having what I think is called "case-head separation." Am I correct on that? I've never had any other problems with other brass, just the LC. Is there a difference in the size of the case head that would cause this, or would it be more likely that there is a discrepancy within the case wall/webbing that would cause this issue, since the Lapua and Winchester brass isn't having any problems. I'm still very knew to all of this so I would greatly appreciate any explanations/advice/thoughts that I could get. TIA
EDIT: These seven cases are out of close to two hundred rounds loaded in LC, as in 7 rounds out of a case of 200.
The two cases on the far left and the one case on the far right are also ruptured, but only slightly. No gas or carbon seems to have come through those casings but there is what seems to be a surface crack on the outside case walls.
EDIT: These seven cases are out of close to two hundred rounds loaded in LC, as in 7 rounds out of a case of 200.
The two cases on the far left and the one case on the far right are also ruptured, but only slightly. No gas or carbon seems to have come through those casings but there is what seems to be a surface crack on the outside case walls.