Getting a lot of brass shavings from a new 8.5" 300blk build. There is a mark on the back of the fired brass, so I am almost certain the brass is being shaved off by the ejector/ejector hole. Everything I’ve read on the fix involves very slightly breaking the edge on the end of the ejector. However, I was wondering if I should also smooth out the sharp edge at the opening of the ejector hole. Seems to me that if brass is flowing into the ejector hole and being shaved off, it’s more likely being done by the edge of the hole, and not the ejector. If I turn a little round grinding stone by hand in the ejector hole, this should break the edge, right? Just one or two light turns? Or maybe a pencil eraser with some lapping compound?
I could be and usually am wrong but this seems like an over gas issue…
If brass is flowing into the ejector hole, you have a serious over pressure problem.
Pictures of the head would help.
Do you have any feeding issues?
No feeding issues, gun runs fine. Ammo is 120gr supersonic umc from Wally world. I’m going to look at the bolt face with a magnifying glass to see if there’s any burrs or anything, but it looks smooth to me
It’s about impossible to tell anything without pics, information, part in hand, etc.
Should the ejector edge be sharp? No, neither should the bore transition.
There can be so many things to contribute to this. Maybe excess pressure? Why could pressure be in excess? Maybe soft brass? Maybe a defect in the bolt or ejector pin, etc?? Who knows? There’s a lot of stuff out there, many things can be less desirable.
While I do suspect some things over others, it would be more of a generalization than in a specific application for this issue.
With that info, I would look at chamber issues first.
I am not an expert. But in my opinion, there is a good chance the shavings are from your extractor instead of or in addition to your ejector. I doubt the ejector hole has anything to do with it.
Joe Mamma
Headspace was checked during assembly. The bolt came with an extractor o-ring. I removed it and am going to shoot it again. I prefer to not to use those orings anyway, unless absolutely necessary. Although in which case, something else is wrong.
The mark you see on on brass, is it rear of rim along with headstamp or front inside of the rim? Are you shooting supersonic reloads? What are the brass manufacturer? What are the bolt manufacturer?