atblis
Member
0.252" doesn't sound out of spec. Hmm, interesting.
Split necks in 223 cases issue
- Thread starter Sommerled
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gunnysmith
Member
What atblis said:
That is measured after brass "spring back" And is definately not acceptable,
It could be much more.
That is measured after brass "spring back" And is definately not acceptable,
It could be much more.
243winxb
Member
This makes no sense to me.
The neck measurement or the cast can't be correct. 
atblis
Member
How about some pictures of the brass with the cracks?
medalguy
Member
Not trying to hijack this thread, but I just started reloading a batch of 5,000 5.56 milsurp brass that came from a military installation and it was all once fired (with crimped primers). I procesed the brass and started reloading it. In the first 500 rounds, I discovered four rounds that split at the neck when I was seating a Hornady 55 gr FMJBT bullet. I never have fired this brass.
The splits were longitudinally down the neck and partially around the circumference where the neck begins to flare out. These were all LC08 brass. Maybe there's a problem with that year's production?? The OP said some of his brass was LC08 also. Interesting.
The splits were longitudinally down the neck and partially around the circumference where the neck begins to flare out. These were all LC08 brass. Maybe there's a problem with that year's production?? The OP said some of his brass was LC08 also. Interesting.
Maj Dad
Member
Adjustable Gas Valve?
Is the gas valve on the "normal" setting? The SIG gas system bleeds off excess gas as it functions, so it wouldn't seem that it could be over-powered, unless the two-position gas valve is on the setting for heavy fouling (and in which case the operation would be more forceful).
In my many (too many ) years of shooting and reloading, I have rarely encountered split necks on 5.56 or .223, GI or commercial (or any other rifle caliber). I have caused my share of them reloading, but short of old ammo (e.g., Spanish 7x57 dated 1912 fired in the 70's and some GI 30-06 over 50 yrs old) I've just not seen it. I don't mean at all that I doubt the experience Sommerled had - far from it - just that it really caught my attention. If SIG says it's within specs, then unless the specs make it more likely for splits to occur, the problem lies elsewhere.
Is the gas valve on the "normal" setting? The SIG gas system bleeds off excess gas as it functions, so it wouldn't seem that it could be over-powered, unless the two-position gas valve is on the setting for heavy fouling (and in which case the operation would be more forceful).
In my many (too many
) years of shooting and reloading, I have rarely encountered split necks on 5.56 or .223, GI or commercial (or any other rifle caliber). I have caused my share of them reloading, but short of old ammo (e.g., Spanish 7x57 dated 1912 fired in the 70's and some GI 30-06 over 50 yrs old) I've just not seen it. I don't mean at all that I doubt the experience Sommerled had - far from it - just that it really caught my attention. If SIG says it's within specs, then unless the specs make it more likely for splits to occur, the problem lies elsewhere. Sommerled
Member
It is not good. The nato ammo was 08 headstamp, factory not handloads. It is also possible that my chamber cast was not accurate. (i had never done that before and used a rigid polyvinylsiloxane material, and not that cerrosafe? stuff. Got it from a family member who is a materials scientist at 3M who told me it was a medical product and extremely accurate if measured right away).
I have not shot the gun since I got it back but I checked the gas valve and it was in the normal setting.
I have only been handloading for 11 yrs. but have loaded over 10K of 223 for my guns. Something doesn't seem right.
I have not shot the gun since I got it back but I checked the gas valve and it was in the normal setting.
I have only been handloading for 11 yrs. but have loaded over 10K of 223 for my guns. Something doesn't seem right.
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