i have some older 15 years + 1st. time firing rem. brass cases, they are splitting (1-6) small splits just above the shoulder, base of the neck very small apx. 1/16 in. called rem. help line. NO HELP ( brass to old.) they have no sign of high presure, can any one tell me what might cause this. i do load all my bottle neck rounds from 30-06 to 22 hornet and i have never seen any thing like this, i am afraid to reload them. i am shooting them from a ar 7.62 x 39 123gr. hor. sp. .310 dia. any ideas? THANKS
question , 7.62x39 remington brass splitting
- Thread starter tgun0223
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badkarmamib
Member
Are you 100% certain that they are actually splits, and not carbon-filled scratches from the barrel extension lugs? I only ask, because I was tossing a lot of .223 brass due to "cracks" that would not come clean, but later found out that they could be buffed out with a Scotch-Brite pad.
LiveLife
Member
Pictures would help.
LiveLife
Member
Do you have other lot of brass you can reload using same bullet/powder?
If they don't split at the neck, problem could be brass related.
If they split at the neck also, then it may not be brass related.
BTW, Welcome to THR!
If they don't split at the neck, problem could be brass related.
If they split at the neck also, then it may not be brass related.
BTW, Welcome to THR!
good idea i will try that, thanks for the welcome!
i have tryed steel cases and they do not split, may not be a good comppairson tho. thanks ..i know i can not spell
Ifishsum
Member
I had some older Remington 30-30 factory ammo do the same thing, 1/4 or more of them were splitting at the neck/shoulder junction. At the time I didn't have very much 30-30 brass so I annealed the cases that survived the first firing and have been able to reload those pieces at least a 2-3 times now so far...Now that I have a decent supply of cases I might not bother but it definitely did keep the others in the batch from splitting. Mine was definitely a problem with the brass in that particular box of ammo and not with the rifle.
LaneP
Member
I love Remington products, particularly their primers and percussion caps, but I'm not the #1 fan of their brass. I had some brand new R-P brass split full length on their first firing with .454 Casull high end loads. Not book max loads, but close. I shoot R-P stuff in a lot of calibers and it's a mixed bag, sometimes it holds up great, sometimes not, but I seem to have more issues with it than other brands.
armoredman
Member
The RP brass I had took small rifle primers, so I got rid of them early on, and most of mine is Winchester now. No issues with splitting, but I load mostly cast.
I got more info and a pic. the pic. is once fired, center pic. is a never loaded sized case to compare, i found a box that was once fired through a sks so did,nt have a issue with that gun, only with a new ak type 7.62x39, so it looks like its the chamber in the new rifle? looking at the shoulder it looks set back a little. can i do anything to fix the new rifle? any ideas ? thanks for all the reply,s it helped me look at things closer . thanks tim
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entropy
Member
OK, you finally posted a photo, now how about some detailed photos? Several good close-ups of the neck area of each in detail would be much more helpful than a group photo from distance that's too dark to show much.
Now help us look a little closer, we may be better informed to come up with a solution.
OK i will get my wife on that thanks
Wreck-n-Crew
Member
Those are not like the normal case neck splits I am accustomed too seeing. Something seems off to me whether in the gun or die when sizing. But I could be wrong.
Blue68f100
Member
Looking at those looks like there is some very sharp edges on the barrel extension nut. Not what you normally see. All of these fired in your AR, Right?
I would inspect the gun and magazine very close for sharp edges where the bullet feeds. I've seen a few magazines with a bad front face that would cut/gouge the necks as a round was fed. Barrel extension nuts can have very sharp edges if they have not been deburred from the machining process. I've spent hours dehoring barrel extension nuts before assembling onto uppers.
I would inspect the gun and magazine very close for sharp edges where the bullet feeds. I've seen a few magazines with a bad front face that would cut/gouge the necks as a round was fed. Barrel extension nuts can have very sharp edges if they have not been deburred from the machining process. I've spent hours dehoring barrel extension nuts before assembling onto uppers.
they were fired from a new ar, a budget rifle off gun broker the splits are random all the way around the case, thanks
troy fairweather
Member
Looks like corrosion cracking. See any green/blue in the cases. I had the same with a few boxes of rem 8x57.
no corrosion that i can see, all un-fired loads look new, shinny brass , taking apart now to get a better look at the chamber, looks like a step cut where the neck taper should be. thanks
entropy
Member
Looks to me like your barrel is set back a tad too far. If the taper is also too steep, that certainly could cause the splits you're experiencing. I recommend bringing the brass in with the gun to a gunsmith that has AR experience. Not having seen the inside of the chamber, I'd guess at a minimum you'll need the barrel reset, possibly a quick trim with a reamer if it still does this after resetting the barrel, and I'd have them clean up the barrel nut extension if rough.
Your wife took good pics.
Your wife took good pics.
thanks, that is exactly what the shoulder looks like, set back just a tad and a shorter taper thanks again!Looks to me like your barrel is set back a tad too far. If the taper is also too steep, that certainly could cause the splits you're experiencing. I recommend bringing the brass in with the gun to a gunsmith that has AR experience. Not having seen the inside of the chamber, I'd guess at a minimum you'll need the barrel reset, possibly a quick trim with a reamer if it still does this after resetting the barrel, and I'd have them clean up the barrel nut extension if rough.
Your wife took good pics.
243winxb
Member
Really, testing with steel cases.
Buy some new brass or fire some factory ammo using brass, as a test. Good quality. Federal makes 3 types.
Seen splits like this before. Mostly bad brass.
If a chamber problem, new factory brass should still form to the chamber. Cheap ammo doesnt always get the extra annealing when manufactured.
photobucket is holding my photos for ransom, so poor quality photo. Www.photobucket.com/joe1944usa
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the brass in picture is rem. the steel cases fired was just to see if the new rifle would go bang, and to get the scope close, not really a test, the main reason i bought the rifle was to get rid of excess junk steel ammo and have a little fun shooting, bust some rocks, thanks for replyReally, testing with steel cases.
Buy some new brass or fire some factory ammo using brass, as a test. Good quality. Federal makes 3 types.
Seen splits like this before. Mostly bad brass.
If a chamber problem, new factory brass should still form to the chamber. Cheap ammo doesnt always get the extra annealing when manufactured.
View attachment 871852 photobucket is holding my photos for ransom, so poor quality photo. Www.photobucket.com/joe1944usa
a little more info that mite shed light on my problem, the shoulder looks normal on a steel case no setback, out of 20 brass rp cases there were 4 with no splits and no shoulder set back , so it does,nt happen every time, maybe this points to something else? i am a newbe to the AR type rifle, but like to learn all i can, this may not change your earlier advice not sure? thanksLooks to me like your barrel is set back a tad too far. If the taper is also too steep, that certainly could cause the splits you're experiencing. I recommend bringing the brass in with the gun to a gunsmith that has AR experience. Not having seen the inside of the chamber, I'd guess at a minimum you'll need the barrel reset, possibly a quick trim with a reamer if it still does this after resetting the barrel, and I'd have them clean up the barrel nut extension if rough.
Your wife took good pics.
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