05-11-2022, 12:35 AM
VASCAR2 Wrote:If I was in your situation fdbyrne78 Id take a close look at the ejector. Is the tip rounded or is it beat up. You might consider clipping a couple coils off the ejector spring. It is not unheard of to get ejector swipe just because you have a long ejector or a stout spring. Id compare the ejector and springs between your different AR-15 bolts. I think your ejector swipe is not consistent with some of the velocities which I think are well below 52,000 psi.
I have one 6.5 Grendel AR-15 that marks the brass more than my others. If your primer edges are still round and not flat plus good consistent ejection I think Id do some investigation on the ejector. There are forum members who trim coils off their ejector spring to get less damage to their brass.
Good suggestion. I forgot to mention that I pulled the ejector and rounded the edges. I checked it up in a drill press and ran a fine diamond file over the edges. It didn't help which really pissed me off because I was sure that was it. I then pulled out the spring and clipped a couple coils. After that I still had the marks but ejection was really weak. Most of the brass landed on the shooting bench with one stovepipe which had never happened before.
After that I tried a different bolt in the same carrier. When that didn't help I threw in the BCG from my 16" BA upper that has no issues and again, no change.
I have to admit, I did a lot of checking things and rechecking things since my last post because I really feel like I should be able to figure this out and I honestly hate asking for help.
I may try loading them another 0.020" shorter and trying again. I've never measured neck tension so I guess it's possible that I don't have the jump I think I do after the bolt cycles.