Finally got around to trying to trying some handloads for my AR-10. Loaded up some groups of 168 Amax and 155 TMKs at magazine length.

The first group of 168s averaged 2597 fps and the 155s were 2814 fps. By comparison some Magtech 168s I used to zero the scope were 2483 fps.

So yes, my loads were hotter than some factory ammo, but were within the range I expected for the charge weight. Yet on my loads the ejector just ate the brass for lunch. The factory Magtech looked beautiful and loads I have made for my bolt guns also look fine.

What is it about an AR that would make it do this? I can understand if there is some smearing but don't get the gouging and burrs it left. Will overgassing contribute to this? If I need to back them off then so be it...but just perplexed as to why this occurs.


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