Here's a new one on me. I am familiar with the signs of excessive pressure when reloading but how about factory ammo?
Here's the story: I have a DPMS AR I bought several years ago. It's been fired some but not a lot. Recently I started back shooting more and was shooting the DPMS with some reloads I had. I either bought them, doubt it, or loaded them years ago. They showed sign of high pressure, flattened primers, and some even fell out when ejected. This was on LC cases. It was also misfiring with light primer strikes. I put it up until I could clean the bolt and make sure everything was OK. It all checked out. The chamber was also cleaned at the same time (brush). Today I took it out again and was using Federal 55gr FMJ ammo bought at WM (100 pack). I happened to notice a couple of the cases had flattened primers (not as bad as the reloads) and one had backed out enough you could feel it. I can buy that with reloads that were a tad hot but not factory. That's something I've never seen and am at a loss for the problem. I talked to another LR shooter and he agreed it was high pressure but didn't have a clue why.
Any ideas? It's shelved until I get this figured out.
Here's the story: I have a DPMS AR I bought several years ago. It's been fired some but not a lot. Recently I started back shooting more and was shooting the DPMS with some reloads I had. I either bought them, doubt it, or loaded them years ago. They showed sign of high pressure, flattened primers, and some even fell out when ejected. This was on LC cases. It was also misfiring with light primer strikes. I put it up until I could clean the bolt and make sure everything was OK. It all checked out. The chamber was also cleaned at the same time (brush). Today I took it out again and was using Federal 55gr FMJ ammo bought at WM (100 pack). I happened to notice a couple of the cases had flattened primers (not as bad as the reloads) and one had backed out enough you could feel it. I can buy that with reloads that were a tad hot but not factory. That's something I've never seen and am at a loss for the problem. I talked to another LR shooter and he agreed it was high pressure but didn't have a clue why.
Any ideas? It's shelved until I get this figured out.