So, about 10 days ago I posted about an apparent increase in pressure without an increase in velocity in my 6 GT. This was based on how beat up my cases were after firing and a very stiff bolt. I got lots of possible solutions and they were all based on sound reasoning.
Today I went to the range with one more attempt to solve the issue before I pulled the barrel. I immediately got a case failure so I stopped and started taking things apart. I found my Proof barrel had loosened from my Defiance action so much so that I just removed the barrel by hand. I've never known anyone else's barrel to come loose like this. A gunsmith installed this one and I watched him torque to about 75lbs. Could this cause other hidden damage to the receiver. Is this more common than I think?