tut, the CIP service pressure is in the 8000 - 9000 psi range for the 12,000 psi proof firing.

Blowing the barrels is one of the less likely issues with high pressure. The more likely issues have to do with overstressing the action bar, the jointing, the locking, and/or the wood bedding. Pounding a gun prematurely off-face is the most likely issue.