I have a 6.5 saum with about 300 rounds on the barrel and ran into issues recently. Everything is the same on the load, same lot numbers on everything and even pulled a few rounds down to make sure the charge was correct. I had a hard to lift bolt on a couple rounds then popped a primer out of the case. Suspected a carbon ring, cleaned really good and soaked the area with C4 then scrubbed with a brush. Cleaned out the barrel and chamber then tried it the other day, it popped primer on the first round so I stopped. I don't have a borescope to check for carbon. Is it possible that the barrel took longer than normal to speed up and I just need to back the powder charge down? 1sr gen hornady brass, 60.1 grains with a 140 hybrid. 015" off the lands. It wasn't a hot day and the load development was done on a hotter day when I originally did testing. I've gained right at 50 fps since this started, installed the chronograph just to see on the shot the other day to try to help figure out what is going on.