blown primer, S&B new fmj ammo

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big bear

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My rifle, M14 Dr tuned Norc 2007( Heasdspace 1.638).Had blown primer yesterday New S&B 147grFMJ , puff of smoke, primer backed part way out. This stuff is too hot for M14 I think.I have shot about 100rds of this stuff, first problem. Milsurplus and my reasonable reloads no problem. Anyone have similar problem.
 
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Not with the S&B stuff But at yesterdays clinge/range session, one of the fellows was using the new bonded (red box) 150gd winchester, and the same thing happened. Except with his, when the ejected case was picked up, the primer was completey missing.
Rifle is an all usgi hybrid.
 
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I've had this happen with S&B's 150gr FMJ... so, what I learned is that maybe the S&B stuff is loaded a bit toasty, and that the brass is great to reload. Be sure to chamfer the primer pocket tho', else the primers will need more force than they should to seat.

Sometimes I pull the bullets, and check the powder weights; these I've noticed can vary (and the powder is a dreamy w748-looking ball type...), so I throw it all together, average it out, err on the light side if necessary, and put it all back together again with corrected powder weights.

The ammo's fine I'd say, could you mail me the brass? ;)
 
This happened to me recently with some Federal blue box 150g ammo. I figured what's the worst that can happen, and mag dumped the other 3 rounds.

I'm no expert, so I'm not going to say what I think about the topic other than it happened to me and I seem to be fine. So fine in fact I'm going to tell my world of warcraft guild that I'm tired of being called the new guy, and I should be given access to the guild chest. I've donated more of my time and items than most and all they do is sell the stuff. Maybe I should go play for the chinese, I can get a dark elf warrior to level 17 in what, 4 hours? You try to jump me in stormwind and you're gonna get run down by my hometown gnomies riding with my pwnies all like 'AZN PRIDE #####ES!!!1"

8148770-two-women-feeding-man-with-grilled-beef.jpg
 
S&B is the only FMJ ammo my M-14s will pierce when struck. I had two that way. If anything I'm thinking their primer cups are very thin and/or very soft.
I posted about it last summer, made me wanted to look for Mil-spec CCI primers. The velocity was standard NATO at 2750 +/- 30 in my M-14. Look at all your fired cases and are they all very deep primer penetration, compared to say a Winchester primer or AE etc?
 
I sharpened my firing pin just to achieve this

lol jk I actually just dented it trying to get the extractor back in with a screwdriver
 
enough evidence for me

Not going to use it in my gas operated rifles anymore, I'll have to find something to shoot it through I guess. Use it for getting my bolt 308's on paper if I change scopes and such. thanks for the info, wish I knew it before i bought 500rds of the stuff. At least someone thinks the brass is good.
 
ahem, anyone up to sell that crappy S&B .308 Winchester ammo, then?

I'll give you 50 cents a round, nice guy I am. :) ...after all, the primers burn through! ...what garbage.
 
again? why?

Cleaned rifle, lubed, 1st round no ejection, second round ok, third round pierced primer, cleaned it again next round primer flattened alot,high pressure. Rifle in case, shoot something else? Any ideas what's going on. Using SA surplus ammo. About 400rds through rifle , SA, Norinco, Hirtenberger,PMC, no problem.:confused:
 
I shot 1200+ rounds of this last year through a stock Poly without a single hiccup.
I love it at $0.60 per and have saved all the brass to go even cheaper next time through.
 
So it's giving you grief with S&B and SA?
Iirc your firing pin protrusion and firing pin hole bith passed inspections. Can't remember the headspace measurement.
 
M14Doctor said:
So it's giving you grief with S&B and SA?
Iirc your firing pin protrusion and firing pin hole bith passed inspections. Can't remember the headspace measurement.
Click to expand...
Your report stated: 1.638. Shot 100's of SA no problem, plus Norinco, old German and Santa barbara surplus. Blew primer with S&B and have fired only 6 rounds since them , 5 out of 6 problematitic. Firing pin does not look chipped to naked eye.
 
Have you disassembled the bolt and thoroughly cleaned the firing pin channel.
Any time a pierced primer occurs, brass bits can and do get drawn into the firing pin channel. If this happens, a stuck firing can cause some problems.
Not saying for sure but something to check.
 
what guys don't realize is that a blown primer is like a cutting torch blowing back into the bolt. Seriously take that sucker apart and clean out the garbage and check the firing pin for damage.
 
Oldsmobiler said:
what guys don't realize is that a blown primer is like a cutting torch blowing back into the bolt. Seriously take that sucker apart and clean out the garbage and check the firing pin for damage.
Click to expand...

I agree . I have had IVI ammunition blow primers in my M1A .Many of you have put a lot faith in surplus ammunition there is a reason that it is surplus . All militaries check there ammunition and perform tests by lot number like CUP in a test gun velocity , cold weather and hot weather performance test as well . The ammunition that fails to pass is sold as surplus it should come as no surprise that these failures occur in surplus ammunition
 
The S&B the OP is referring to is not surplus, but good advice about the damage a blown primer could cause. Will have to remember that.
 
did all above

M14Doctor said:
Have you disassembled the bolt and thoroughly cleaned the firing pin channel.
Any time a pierced primer occurs, brass bits can and do get drawn into the firing pin channel. If this happens, a stuck firing can cause some problems.
Not saying for sure but something to check.
Click to expand...

There was nothing in channel. firing pin seems smooth. Firing pin hole is larger than firing pin hole on my GI bolt.Norc .0.081", HRT bolt 0.0787" by my measurement. Caveat, I am not a machinist or anything remotely akin to one, but there is a difference in hole diameter size. You can tell just by eyeballing it. I can't see anything else amiss.Firing pin tip looks , feels smooth. Looks like my GI spare firing pin. Not keen to put in a new firing pin if firing pin hole is problem ( and risk screwing up a perfectly good firing pin) Is this the problem? (pierced primers), result of pierced primers? What to do? I recleaned the rifle and shot it and got another pierced primer, by the way. So until this is fixed I've got a nice paperweight:(

The sun is shining, I've got my first saturday off weeks , and my favorite rifle is on my work bench disassembled= a very unhappy camper.
 
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