What's causing this?

[kart racer]

One is a fctory wwb 115 fmj,the other is a reload w 5.2 of unique w/115 gr jhp,both fired from a cz pcr.

 

[ribbonstone]

Does look like one of them popped that primer a bit. Looks like a rectangular firing pin hole and primers that flowed back a bit on rifing...usually that's a sign of eitehr too-hot a load or too soft a primer. While taht load seems to be in bounds, it might be that for some reason, that particular chamber/barrel is producing higer than expected pressures (although the rest of the case head doesn't look beat up, and I'd expect that if pressures were truely high).

SOme guns just do that with certain brands of ammo or primers...might want to change primers.

 

[kart racer]

breechface


Here's a picture of the breech face-upside down of course

 

[45crittergitter]

Premature unlocking?

 

[Three Man]

I'd Say a 9mm Glock.

Typical marks left on brass made by glocks. Nothing to worry about.

It wouldn't hurt to change out your firing pin spring though if CZ has one.

I would worry more about the ejector contact so close to the primer.

 

[Ol` Joe]

Looks to me like the striker isn`t returning to the inside of the bolt properly and is still in contact with the primer when the slide is starting to unlock.
Weak spring maybe??

 

[HSMITH]

Are you absolutely positive those are from your gun? Were they all that way?

That appears to be 99.95% certain to be brass fired in a Glock.

 

[Three Man]

Looking at it again I find it hard to belive that brass came from the slide you are showing.

You must have picked up someone elses glock fired brass.

Glock has the rectangular firing pin holes stamped out just like it looks on that brass.

 

[kart racer]

The ones from my cz 85 look normal,the ones from the pcr look like that.I shot some at a friends house and it is from the pcr.That is what has me baffled.There is nothing I see that can cause that shape.Even when I shot with 1911 tuner a coupla of weeks ago that's the way they looked.Nobody had a glock there.I marked some brass,but will test again this week to make 100% sure.

 

[JohnKSa]

Those cases were not fired in the gun whose slide is pictured.

Those cases were fired in a Glock pistol.

 

[kart racer]

I hope that's the case,I'm gonna mark 200 rds tomorrow w/a red marker.The one time I went shooting there was someone with a glock but today there wasn't.It just had me worried since I just started reloading.I sat here all night trying to figure how in the hell that shape shape could come from my gun.

 

[RyanM]

Just because someone wasn't shooting a Glock there that day doesn't mean people with Glocks never shoot there. Unless they were hot when you picked them up, those cases were probably sitting around for awhile.

In any case, they're also fine for reloading, especially if you're not shooting a Glock. They were just a bit hot, or the primers were a little soft.

 

[kart racer]

Found out what the deal was,the guy I went shooting with had marked some of his reloads with a red marker too,he doesn't have a glock,but a guy came up to him yesterday w/a glock and had him shoot 2 mags full,he neglected to tell me he shot some of the reloads thru the glock-I knew they were my reloads from where/how they were marked.Chris marks his reloads different and I couldn't figure out what was going on.

 

[ulflyer]

Joe, you just wanted to pull our chain didn't you? But if we could have kept you worried about the PCR then you'd have sold it to me, thinking you had a lemon. Dang, I'll get it sooner or later.

 

[kart racer]

Ted,that power pistol is pretty stout,I had em loaded light and the muzzle blast was impressive.I think it'll be good for max/near max loads,the unique seems a little better for softer shooting stuff.I wasn't as accurate with the new 85,hopefully when the trigger gets a little smoother I'll be better with it.The pcr doesn't seem to care what ya run thru it.

 

[caz223]

I was just too late. Yup, those are glock fingerprints, easily visible to the whole world upon inspection.

 

[fulloflead]

Yup. That round didn't come out of that gun. That's a Glock hicky.

I could totally see how that would blow someone's mind, though.

.

 

[The Bushmaster]

Yup...Glock...