What 10mm firearm causes these dents in the ejected cases?

[nitesite]

I've been loading some once-fired 10mm ammo for a friend, and a lot of the cases have a recurring theme. There is a dent in the side of many of the cases, much like you would see in a .223 Rem case fired from a Mini-14 Ranch Rifle.

The primers suggest that the 10mm rounds were shot thru a firearm other than a Glock. Nice deep/round indentations without the square outline.

I'm just curious. Maybe a S&W pistol (of course no 10mm revolver did this)? Perhaps a HK 10mm MP5? Witness pistol? Something else?

Hoping this gets some replies.........

 

[ReloaderFred]

My Witness pistols don't mark the brass at all, and I've got several in 10mm. It looks to me more like a 1911 type pistol. My S&W 1006 also doesn't mark the brass.

Hope this helps.

Fred

 

[Vitamin G]

I dunno. My Delta elite doesn't ding brass like that, nor does my buddy's EAA witness. Maybe something poorly sprung, whatever it is.

 

[nitesite]

Good.

We're narrowing down the field of possible suspects!

 

[DogBonz]

It's not from a glock

Golck fireing pin imprints are usually rectangular.

 

[Lone_Gunman]

Pretty much any auto can dent brass like that. Common things being common, I would suspect the offending gun would be a 1911, since we know it isnt a Glock because of the firing pin mark.

 

[The Bushmaster]

Sure Lone Gunman...Pick on the 1911...Oh...Aah yeah...My Colt 1911 .45 ACP does dent the cases.... But I ignore it as it causes no problems...

 

[tbtrout]

My Sig 220 in .45 does the exact same thing. I do not know why.

 

[Idano]

Any auto can do it depending on tension of the buffer spring and the load which will affect the speed of the action. I have a SIG that can throw brass 20' with a medium load that wackes the brass pretty good coming out of the ejector port. My Beretta will also throw brass pretty hard on full house loads.

 

[loadedround]

My Colt Delta Elite dented cases exactly as shown in the picture until I gave it to an oldtime pistolsmith that fixed it. I'm sorry but I don't know exactly what he did besides some work on the ejection port.

 

[pack_rat]

The MechTech CCU will dent cases like that.

 

[Mal H]

As several have said, almost any pistol can mark brass like that if the parts of the ejection/recoil system are a little out of tune.

This is too obvious, but you said, "... some once-fired 10mm ammo for a friend ...". I don't suppose they are from the friend's pistol, are they? Or are they range pick-ups?

 

[Odnar]

My .40 Glock 27 makes some small dings in the side. Nothing nearly that extreme, though.

 

[TinCan]

I have a Springfield Omega (German Peters-Stahl on a 1911 style frame) 10MM with dual extractors that won't cause a dent like that,

BUT, I believe the FBI still uses MP5's in 10mm. I saw one in use a few months ago. I believe full auto might make that kind of dent.

 

[nitesite]

This is too obvious, but you said, "... some once-fired 10mm ammo for a friend ...". I don't suppose they are from the friend's pistol, are they? Or are they range pick-ups?

Yes, it is an obvious question that needed to be answered.

Tom bought it once-fired from The Hunting Shack so I (we) have no clue as to their origin. Every case is FC headstamped (Federal Cartridge) and had the same primer marks (no Glocks) so I think they all came from some sort of departmental qualification or training academy.

I'm merely curious, not worried. The dents iron out in the sizing die, and what remains shoots out so you can hardly see them.

I had a 187-series Mini-14 that dinged the cases as they struck the charging handle (I know that isn't the correct nomenclature but it's all that comes to mind right now). They looked a lot like these.

Thanks, everyone!

 

[Stanley Greenman]

Greenman

The dents in the sides of the shell cases are the result of what is referred to as roll over. A properly "tuned" extractor and some extra porting will cure this problem.