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Old 10-17-2005, 06:27 PM   #1
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Carbine Brass Question - Bulge

I have reloaded this brass a couple of times and there is a bulge in the brass near the base (see highlight). Is this a proplem with the brass or should I have the carbine checked out? I have noticed it the worst on LC 72. I load H110 and surplus 110gr bullets. Thanks
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File Type: jpg Carb Case 2 (425 x 417).jpg (64.4 KB, 580 views)
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Old 10-17-2005, 09:36 PM   #2
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I am not a reloader, but I have read alot about it. I would not reload that brass. That mark is indicative of brass that is about to let loose. If that happens while you are firing, it will blow the back of the case off, blow your mag out of the well, damage your carbine and maybe yourself. I am sure Jimb will pop in here with some more info, but do a search, this happened to a member recently and it destroyed his barrel and I believe peppered him with brass fragments.
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Old 10-17-2005, 10:05 PM   #3
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It's pretty rare for military brass to bulge after only 2 reloads. If you are heating up the loads, it will contribut to the problem. Are you sure the brass has only been loaded 3 times? I would expect 6 or more without trouble if it's not loaded hot. That said, I would toss any brass showing bulges.
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Old 10-18-2005, 04:33 AM   #4
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What you are experiencing is relatively typical for .30 Carbine brass and, for some reason, is frequently encountered with late (late 60's-70's dated) Lake City brass, with LC 72 being a real "problem child".

Typically, when the brass is really on it's "last legs", you will start to experience/see not just a bulge, but rather, more of a sharp creasse in the brass, if not actual cracks in the area----if that starts to happen, toss the rest of the batch of brass and don't reload it. Otherwise, I've experienced head separations with .30 Carbine brass and while certainly not a desirable situation, in my personal experience, it is not generally either dangerous or damaging to the firearm.
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Old 10-18-2005, 10:12 AM   #5
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I've seen the same problem - it's due to lack of support for the full web of the cartridge, which is inherent in the design of the M1 carbine. Federal Eagle brass shows a significant bulge as well (after a single firing), but Winchester white-box much less so.

Personally, I wouldn't reload brass that looked like that.
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Old 10-18-2005, 03:36 PM   #6
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Is the bulge there after resizing? I mean the actual bulge, not the appearance. If the brass is alittle wimpy it bulges after the shot. When you resize the case, the bulge, which was a high spot, gets put back. But you'll always have that mark. Check out some 9MM or .40S&W if you want to see real bulge.
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Old 10-18-2005, 04:12 PM   #7
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The bulge is there even after resizing. I don't load too hot. 14.5 grs of h110 which is the start load recommended by Hodgdon. If you take the max 15grs and reduce 3% for H110 per their instructions (in bold). I have seen bulges in pistol brass, especially 40 S&W from Glocks. I guess I just didn't expect that from a more supported rifle round.

Chairborne Ranger actually some of the cases are as you describe with an actual crease in th case. That's why I was afraid there was something wrong with the rifle. I am going to toss all my LC 72 brass. I am currently working up a batch of LC 53 so hopefully that problem will be eliminated.

Thanks everyone for all your input and advice.
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Old 10-20-2005, 03:41 PM   #8
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It sounds like the problem is primarily the brass, but your sizing die couls be contributing to the problem as well. I've seen dies that caused similar problems when insufficient lube was used. Particularly if the die was very tight. Check other reloaded brass for the same problem. If it appears in any other brass, you may want to replace your sizing die to stay on the safe side.
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Old 10-20-2005, 07:05 PM   #9
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Jimbo, sizing die is a brand new Lee Carbide. Probably only had 500 rounds put through it since I got it. And yes, I do lube the cases. I'll keep an eye out for the same problem on my other headstamps. Thanks for the information
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Old 12-21-2005, 02:45 PM   #10
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I have the same problem (see attached picture). What model carbine do you own?
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File Type: jpg AO Carbine Case Failure.JPG (39.1 KB, 332 views)
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Old 12-21-2005, 03:19 PM   #11
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Guys??? are you using small base dies? Do those dies have a sharp edge rather than a smoothly rounded bottom edge? And have you had the carbines headspace checked. It looks like the web of the cases is being overworked or shaved. If the bulge is still there after resizing, then the brass is being pushed down instead of back in. While this could be the result of soft brass in the head of the case, the dies would also be a contributing factor. Do you trim your cases to the recommended length? Something is definately wrong here. I have cases that I've reloaded 20+ times. I only get rid of them when they get so thin that they won't properly grip the bullet anymore!
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Old 12-21-2005, 04:41 PM   #12
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I've had the bulge happen on factory loads and new brass. What you sees in the picture shows the after effect from shooting the cartridge. The before is brand new, undamaged brass with no evidence of sizing problems. I would not consider reloading any damaged brass. My money is on the defective carbine causing brass failure. If the M1 design is the cause of the problem, reloading would not be very popular with the carbine.
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Old 12-21-2005, 04:46 PM   #13
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If that is happening on factory ammo with the first firing, then the firearm is defective. The barrel would need to be set back farther and rechambered to properly support the case head. I'd send that one back so fast it would be accompanied by a sonic boom!
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Old 09-23-2015, 06:58 PM   #14
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Quote:
Originally Posted by ChairborneRanger View Post
What you are experiencing is relatively typical for .30 Carbine brass and, for some reason, is frequently encountered with late (late 60's-70's dated) Lake City brass, with LC 72 being a real "problem child".

Typically, when the brass is really on it's "last legs", you will start to experience/see not just a bulge, but rather, more of a sharp creasse in the brass, if not actual cracks in the area----if that starts to happen, toss the rest of the batch of brass and don't reload it. Otherwise, I've experienced head separations with .30 Carbine brass and while certainly not a desirable situation, in my personal experience, it is not generally either dangerous or damaging to the firearm.
I agree, I reload 30 carbine a lot and see that all the time, I shoot it, no problems. there is a small portion of the 30 carbine that extends from the chamber. that is where it bulges.
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Old 09-23-2015, 09:22 PM   #15
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scales,

WELCOME ABOARD. - LOTS of carbines do that, as the case on a carbine isn't fully supported..
(The US government doesn't reload so the government doesn't care.)

yours, sw
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