I have a new EAA Witness in 10mm all stock parts that I have shot 50 rounds of Sig Sauer 180 gr. FMJ and 50 rounds of PPU 180 gr. JHP through. The issue I am having is the brass is being dented after it has been shot with the Sig ammo, not as much with the PPU. The Sig ammo seems to have more velocity then the PPU. Any ideas what is causing this, and how I can stop it? See attached pics of dented cartridges.

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10 isn't exactly easy on the brass. The faster you go, the farther it flies, and the crappier it looks

Those who know the Witness will chime in. Beefed up recoil spring?

It's hard to tell without seeing a picture/video or some detail on what you saw when running them. What recoil spring is in it? Have you trimmed the ejector yet? Do your magazines have red followers or marked K10 with black followers?

It is hitting something on the pistol.  You can usually figure out what by fitting the brass crease to the right part of the gun.  Filing on the ejector may help.

All in all, that isn't bad:

It has the stock EAA spring, not sure what that is. Have done no modifications it is brand new out of the box. Mag. is K10 with black followers.

 I run a 22lb spring in my 4.75" pistols and a 20lb in my 6". You need a 20lb to start with shooting the Sig ammo. The ejector is the same for every caliber, etc... in the Witness pistols. It really helps to trim them back a bunch! 

Quote from: sqlbullet on January 23 2016 01:08:18 PM MST


All in all, that isn't bad:

Lol

Look over the pistol the slide to see if you see an brass marks where the brass casing is making contact around the ejection port.  As the brass is being kicked out from under the extractor by the ejector it might be pivoting with enough force to strike the slide port in such a way to dent the brass casing.  Recoil spring increase in poundage may slow the rearward travel to help.

Best of luck getting it solved. 

Before I ever fired full-on ammo I installed a Wolff 22 lb spring. My Match has never even dented brass, that is some severe mangling going on

Brass looks like it was mangled by some crushing tool. Ejecting from a pistol could never make brass that crushed and bent. Lee

Quote from: sliclee on January 24 2016 07:26:46 PM MST
Brass looks like it was mangled by some crushing tool. Ejecting from a pistol could never make brass that crushed and bent. Lee

I assume you are referring to my brass above.

Ejection definitely did make that brass, and several more just like it.  The torn/bent brass  exactly matches the hood of my Para P16-40 10mm.  This happened because the extractor on the gun did not have enough tension and the case was still in the action when the slide returned to battery.  The slide would usually bounce the brass out of the action, but on several cases they got caught on the barrel hood, and this was the result.

This appears to be what you're referring to, except in this case the cartridge got caught vs being "kicked out"...

Thats it!

looks like my old ria tac

<sigh>