Rim damage on AR15 brass after brake installed

[ToddKS]

I recently installed a muzzle brake on my AR. I some junk I had for it straight across. There was no package so I have no idea what brand it is. It has a couple holes on top and three ports on each side.

I noticed that since I installed this brake that I have damage on some rims where the rim appears to be bent backward by the ejector. From what I have read this type of damage is associated with over gassing but I have never had this problem with this gun. The load is the same load I have always used (24.0 gr H335, 55gr FMJ, Rem primer, Fed Brass) and the load is not hot.

Is it possible that the brake is causing this or do I have another problem I need to look for?

Thanks,

Todd

[gunther]

I can't imagine how a brake could cause over gassing, fire it without the brake on. See what happens.

[Mark Gale]

Correlation doesn't equal causation...

... and of course you meant to say "the rim appears to be bent backward by the ejector extractor."

[ToddKS]

Correct, exctactor.

It did not make much sense to me that the muzzle brake would be causing the problem but as I have zero experience with muzzle brakes on AR's I thought I would put the question out there to be sure. I have found stranger things that were true.

[Vlad]

Take it off, shoot it without it, see what the brass looks like.

[ToddKS]

That is my intention just as soon as my range is no longer under water. Heavy rains here have made quite the mess.