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#1035372 - 08/09/08 10:02 PM My AR fired brass cases have tiny dents on them - how big is too big?
LeviSS Offline
Die Hard Member III

Registered: 01/01/08
Posts: 2022
Loc: IL
Quite a few of my fired cases have tiny dents on the sides. They were shot out of an AR, so I don't know if it is something to do with the ejection system or what. They are very, very tiny. Is this normal? Can they be used? How big is too big for a dent?

I'm just getting ready to get my first batch of reloading going, so I'll have several questions I'm sure.
Thanks!
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#1035373 - 08/09/08 10:10 PM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: LeviSS]
TNcrittergitter Offline
Die Hard Member

Registered: 03/05/06
Posts: 571
Loc: Southeast TN
a picture would help, but chances are that they are fine if your definition of "very, very tiny" is similar to mine. Pictures would be a must to give an estimate.

RB
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#1035374 - 08/09/08 10:11 PM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: TNcrittergitter]
LeviSS Offline
Die Hard Member III

Registered: 01/01/08
Posts: 2022
Loc: IL
I'll see what I can do about a pic, but I'm thinking that it'll be very hard to get it to show up.

They are very uniform about where they are located, so I'm guessing it is fairly normal for an AR, but not sure.
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#1035375 - 08/09/08 10:14 PM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: LeviSS]
TNcrittergitter Offline
Die Hard Member

Registered: 03/05/06
Posts: 571
Loc: Southeast TN
turn the flash off on your camera when you take the pics, it will cut down on the reflection and glare and help to see the "dents."
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#1035376 - 08/09/08 10:19 PM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: TNcrittergitter]
Okdave Offline
Seasoned Member

Registered: 12/17/01
Posts: 391
Loc: Watts, Ok. USA
The brass deflector is most likely the culprit.

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#1035377 - 08/09/08 10:47 PM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: TNcrittergitter]
LeviSS Offline
Die Hard Member III

Registered: 01/01/08
Posts: 2022
Loc: IL
After 20 pics or more, two showed the dents. They look slightly bigger in the pics than in real life.



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#1035378 - 08/09/08 10:48 PM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: Okdave]
Sly Offline
Die Hard Member

Registered: 04/15/07
Posts: 594
Loc: Coyote Country
Had the same problem with mine. I put a piece of stick on velcro on the face of the brass deflector and it solved the problem. Another fix is to trim off a little of the ejector spring.
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#1035379 - 08/09/08 11:11 PM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: Sly]
CatShooter Offline
PM senior

Registered: 01/24/02
Posts: 9094
Loc: The Socialist Republic of CT.
I have shot brass with HUGE dents... I just FL sized them to make sure that they would chamber.

90% of the time, the dents blow out and give you a perfect case... when they don't blow out, the round still shoots fine.


.
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#1035380 - 08/09/08 11:15 PM Re: My AR fired brass cases have tiny dents on them - how big is too big? [Re: LeviSS]
Linefinder Offline
Die Hard Member II

Registered: 01/25/05
Posts: 1045
Loc: Colorado Springs
If it's just a dent without a sharp crease in it, you're fine. 50K+ psi irons out a lot of dent.

Mike

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#1035381 - 08/10/08 12:29 AM Re: My AR fired brass cases have tiny dents on them - how big is too big? [Re: Linefinder]
FALFire Offline
Die Hard Member III

Registered: 01/08/02
Posts: 3250
Loc: Wa. State
Reload'em, shoot'em again, the dent will be go away for a nano second, then come back again. Reload'em and shoot'em again, the dent will go away for a nano second then come back adgain.........repeat as often as possible. It's an AR they dent brass, don't worry.
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#1035382 - 08/10/08 12:39 AM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: LeviSS]
Evil_Lurker Offline
PM senior

Registered: 07/30/05
Posts: 6721
Loc: Oregon
I have an H-K .308 that puts a big crease in every case (plus throws the brass about 50 feet). I size them and shoot em till I lose em. If the case mouth isn't cut it doesn't seem to hurt a thing.
The dents in your pics are no concern, mine are at least 8 times that deep.
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#1035383 - 08/10/08 01:57 AM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: Evil_Lurker]
SodakJim Offline
Die Hard Member II

Registered: 02/14/07
Posts: 1658
Loc: Gettysburg, South Dakota
The dents won't do any real harm to the cases and you can just ignore them, or you can fix the prolem. Your ejector spring is to long or strong and should be trimmed a couple coils, usually. The strong spring is snapping the ejecting case against the barrel locking lugs as the case is pulled from the chamber. The location of the dents is a dead giveaway to this problem. If you chamber a resized case and slowly pull the bolt back, you can see the side of the case hit the locking lugs. The spring should be just long enough to fully extend the ejector plunger. If your AR-15 flings the empty cases 12-15 feet, it's a good sign that it's to much. After tunning the spring length, my cases all go into a small pile 3 feet to the right, at about the 3 o'clock position with no case dents whatsoever. It is a very easy fix with detailed instructions at:

http://www.gswagner.com/arejector/arejector.html

Hope this helps.
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#1035384 - 08/10/08 03:37 AM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: Evil_Lurker]
Curt Barrett Offline
PM senior

Registered: 04/21/01
Posts: 5144
Loc: Pacific Northwest
Quote:

I have an H-K .308 that puts a big crease in every case (plus throws the brass about 50 feet). I size them and shoot em till I lose em. If the case mouth isn't cut it doesn't seem to hurt a thing.
The dents in your pics are no concern, mine are at least 8 times that deep.




Ain't that the truth. lol! After seeing the big creases my HK and Galil makes on brass I've never even noticed the marks an AR makes on brass. Like the fellas above said, load em' up.

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#1035385 - 08/10/08 09:16 AM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: Curt Barrett]
TNcrittergitter Offline
Die Hard Member

Registered: 03/05/06
Posts: 571
Loc: Southeast TN
SodakJim,

thanks for the link. Just did mine this morning. Took a grand total of 10 minutes, and I had to go find my dremel tool.

RB
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#1035386 - 08/10/08 09:27 AM Re: My fired brass cases have tiny dents on them - how big is too big? [Re: TNcrittergitter]
LeviSS Offline
Die Hard Member III

Registered: 01/01/08
Posts: 2022
Loc: IL
Thanks guys. I didn't think that it would be a problem, but thought I'd check to be safe.

Thanks for the link for the AR ejector mod. I'll have to do that next time I take it apart.
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