I have since ran several of these Wolf Gold through my Bushmaster and DMPS with zero malfunction. I contacted Core and described the issue to them. They indicated that they would be sending me a shipping label for the upper so they could inspect it. They indicated that it may have a rough or scratched chamber.

This makes sense to me as I bought a new Rem 7400 17 years ago that had a rough chamber, right out of the box, it would pull the rim off of every 30/06 round fired. Sent back to Rem who polished the chamber and no more issues.

This Core-15 had 200-250 rounds of PMC Bronze though it and never acted up until I put the Wolf Gold through it. The Wolf Gold seems to be accurate as the two that went down range out of the Core were touching at 100 yards. My Bushmaster and DPMS seem to not be as accurate.