Excuse the lack of focus with the picture. It actually shows the problem better than the clear pictures.
I have a Brazilian slide.
%20 of the time the brass comes out ok.
%45 percent of the time one side gets flattened like the brass on the left. Flattened close to the mouth tapered down in a triangle with a crease in the middle of the triangle.
%35 percent of the time it gets mangled like the brass on the right. Two dents at looking down from the top at 10 and 350 degrees.
About 1/14 times the brass stovepipes.
I measured my ejector and it was 1.6" Kuhnhausen Volume II claimed that an extra long ejector would be 1.1" so I ground down the ejector to about 1.15".
I am still having the same problems, but it is less violent and less often.
So any ideas about the solution? Should I keep grinding or am I off base.
I don't have the Kunhausen manual in front of me, but does he have the length for a standard ejector? If so, I'd keep grinding, but don't go shorter than the standard. Also, is your ejection port lowered and flared, or 'standard'? (Lowering and flaring might help.)
Ejection port is standard.
Kuhnhausen lists a standard ejector to be about 0.8"
You could also open up the ejection port more; basically a lowered port with a roll over scallop may eliminate the problem altogether.
I had the same problem with a Brazilian slide. I lowered the ejection port and the problem is gone.
Lowering your ejection port to .450 from the bottom of the slide might be in order.
I usually start with a ejector as long as I can as long as it will eject a live round then shorten only if necessary.
Can he face the ejector and maybe get a cleaner release of the brass. I've seen this before but completely reworked the ejector, extractor and port to correct. I was doing a custom on a colt at the time that was bad about killing the brass.
Absolutely, I always face the ejector and angle it as I state in my website. Last couple of times I saw denting that bad I lowered, flared, and put in a extended ejector that was then turned and it fixed the problem.
Most of the time I see denting that bad its in a mil spec that has a standard ejection port coupled with a mil-spec (Short) ejector, I always lower ejection port first when I see this issue, then work on the ejector next.
But lets face it not all mil-specs kill brass so just tuning what you got could easily fix the problem.