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Posted: 10/7/2011 12:49:06 PM EDT
I was shooting today and noticed one of my pieces of brass had a hole burned at the edge of the primer/ primer pocket wall where gas leaked onto my bolt face. Only one piece of brass did this today, out of 60 rounds total. Brass has been fired 5x by me and 6x total so I am guessing it was getting stressed anyway, brass has not been showing pressure signs.
Load: 178 amax, 2.19" ogive 44gr varget win wlr primers lc lr brass However, my question pertains to the bolt on my rifle. It has a tiny dimple in the bolt face where the powder blew out. Is this an issue, or should the rifle still be good to go? Dimple is at 12 o clock in the Pic: 
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Posted: 10/7/2011 12:57:25 PM EDT
[#1]
The dimple will not hurt anything. If you have a bad batch of primers, you will have more. http://i338.photobucket.com/albums/n420/joe1944usa/M16A1%20Carbine/M16A1Bolt.jpg More Photos here
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Posted: 10/7/2011 12:59:54 PM EDT
[#2]
Man I am glad to hear that, I am shooting a match next weekend and would hate to be out of business.
I was thinking this blowout was due more to worn brass than bad primers, is that not the case? |
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Posted: 10/7/2011 1:07:53 PM EDT
[#3]
Mine have been defective primers. The cup has a flaw, thin metal, when it blows out. Other have said gas coming up the side of the primer can do it also, but i have never seen it personally. http://i338.photobucket.com/albums/n420/joe1944usa/DefectivePrimer.jpg
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Posted: 10/7/2011 1:14:34 PM EDT
[#4]
Quoted:
Mine have been defective primers. The cup has a flaw, thin metal, when it blows out. Other have said gas coming up the side of the primer can do it also, but i have never seen it personally. http://i338.photobucket.com/albums/n420/joe1944usa/DefectivePrimer.jpg Thats exactly what my case looked like. Thanks for the info. |
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Posted: 10/7/2011 1:17:06 PM EDT
[#5]
Pressure is too high for those primers.
What type primers are y'all using? (Besides m1ajunkie) |
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Posted: 10/7/2011 1:26:51 PM EDT
[#6]
Quoted:
This happens to all brands if a defect. Pressure is not an issue. My first was Rem. 9 1/2, about 30 years ago. Using the primers in cast bullet 30-06 & 30WCF rifle loads of low pressure still blew them out. Photo is of a Federal primer, not mine. I dont remember what primer put the pock markes in my M16A1 bolt face, long time ago also. Pressure is too high for those primers. What type primers are y'all using? (Besides m1ajunkie) 
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Posted: 10/7/2011 3:36:06 PM EDT
[#7]
Quoted: Pressure is too high for those primers. What type primers are y'all using? (Besides m1ajunkie) +1. Without seeing the fired cases, it looks like pressure. Especially if you see signs that the brass is moving (headstamp getting ironed out and/or boltface features visible on the brass). 243winxb's bolt face would be considered unservicible. |
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Posted: 10/7/2011 4:54:32 PM EDT
[#8]
First I have heard of bad primers doing this .
I would be somewhat cautious as any time you are getting leaking gas it is possible for flame cutting and damage to happen . First thing I would check is the shape and condition of your firing pin. Other danger is the escaping gas blowing crud back towards your face/eye. Generally I would suggest you put some time and effort into watching your brass and not to keep shooting if this keeps up |
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Posted: 10/7/2011 5:41:37 PM EDT
[#9]
Quoted:
Mine have been defective primers. The cup has a flaw, thin metal, when it blows out. Other have said gas coming up the side of the primer can do it also, but i have never seen it personally. http://i338.photobucket.com/albums/n420/joe1944usa/DefectivePrimer.jpg That primer looks pretty flat. 
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Posted: 10/7/2011 7:44:01 PM EDT
[#10]
Pic of my brass. Once again, this has been fired 5x before so it has seen a lot of use. Today I was planning to use this brass for the last time. From what I have gathered by asking other reloaders at various shooting events, my primers are not radically bad. In the pic there is a pretty flat one on the edge at 10 o clock, and also I got the piece of brass that has an ejector mark at the 12 o clock(flash reflected off of it). I don't have the actual blown out piece, but these are all the same age and from today's session. |
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Posted: 10/7/2011 7:49:39 PM EDT
[#11]
More of today's brass.
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Posted: 10/7/2011 9:32:42 PM EDT
[#12]
Those primers are pretty flat, for sure, but absent any other pressure signs, like chunks of rim missing, ejector divots, stuck cases and pierced primers, not totally unheard of.
Chris |
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Posted: 10/8/2011 4:29:49 AM EDT
[#13]
Quoted: http://i405.photobucket.com/albums/pp133/m1ajunkie/100_2211.jpg Pic of my brass. Once again, this has been fired 5x before so it has seen a lot of use. Today I was planning to use this brass for the last time. From what I have gathered by asking other reloaders at various shooting events, my primers are not radically bad. In the pic there is a pretty flat one on the edge at 10 o clock, and also I got the piece of brass that has an ejector mark at the 12 o clock(flash reflected off of it). I don't have the actual blown out piece, but these are all the same age and from today's session. The primers don't look terrible, but the fact that you've seen some brass movement––>excessive pressure without a doubt. The only time I've seen bolt face features on 308 LC brass was when I was quite a bit beyond max. Also, when you're bolt face gets f'd up like that, you'll see worse and worse leakage. |
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Posted: 10/8/2011 4:45:38 AM EDT
[#14]
Here is what I went thru a while back with LC brass using 41.5-42.0g of IMR 4895
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Posted: 10/8/2011 5:06:00 AM EDT
[#15]
Panther,
I was going to pm you this question, but I bet others could benefit as well. Are you still using that same bolt? I am planning to load up 25 rounds at the current load in fresh 1x lc lr brass and shoot them this weekend to get a better judge of pressure signs. I do not want to change my load before next weekend if at all possible, due to the data I already have using this load. I am fairly new to reloading, but I don't understand why only one of these primers blew out in the 375 rounds I have loaded at this current load. |
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Posted: 10/8/2011 7:10:57 AM EDT
[#16]
Quoted:
Panther, I was going to pm you this question, but I bet others could benefit as well. Are you still using that same bolt? I am planning to load up 25 rounds at the current load in fresh 1x lc lr brass and shoot them this weekend to get a better judge of pressure signs. I do not want to change my load before next weekend if at all possible, due to the data I already have using this load. I am fairly new to reloading, but I don't understand why only one of these primers blew out in the 375 rounds I have loaded at this current load. No I am not, SA replaced the bolt under warranty but next time it would cost me since I reload. Anyway I am currently using a Nosler 168 CC pill with a WLR primer with 40.4g of IMR 4895 and this load varies on my 550 from 40.2 - 40.6 in mixed milsurp brass (mostly LC) with a OGL of 2.260" (Shoulder bumped back to 1.628"ish) with a .002" kiss crimp and get about 1.5 -2.0" groups off the bench if I do my part, I reworked my load after the bolt incident but personally believe it was due to me being a tight ass and trying to save money on brass, the brass that caused the bolt face erosion had been reloaded 10X so I now have reduced my load with decent results and may try to say get 5 -6 reloads and watch for primer leakage after 3X |
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Posted: 10/8/2011 7:48:49 AM EDT
[#17]
I just had this happen with a very mild 270 Winchester load using Winchester large rifle primers. Not a headspace problem. About 1 out of 11 blew a pinhole in the edge of the primer. No problem with a different lot number of Winchester primers or with CCI primers or other loads. I contacted Winchester and they wanted to look at the cases and spent primers. I sent them off but have not heard back from them.
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Posted: 10/8/2011 7:59:03 AM EDT
[#18]
M1A fired brass is supposed to be chucked after the fourth firing (third reload). 40.5 grains of IMR-4895 is a maximum load with 168 grain bullets in Lake City brass according to actual pressure tests conducted by the NRA. 44.0 grains of Varget under a Hornady 178 is way over the top in Lake City brass. It's probably over the top for a semi-auto in any brass.
A full two grain reduction is needed when using Lake City when compared to Winchester brass. The following loads are maximums according to the NRA's pressure testing. Lake City brass averaging 179 grains, resized, trimmed and unprimed. 168 grain Sierra match Kins seated at 2.800" Winchester standard large rifle primers 40.5 grains of IMR-4895 41.5 grains of IMR-4064 43.0 grains of WW-748 All of these will produce close to 2500 fps in a M1A and closer to 2600 fps in a 26" bolt action. If you want more velocity (you won't need it to shoot good groups) switch to Winchester brass and add a grain or two more powder. Using Lake City requires a lower powder charge. If anyone thinks otherwise look at the photos. |
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Posted: 10/8/2011 8:10:42 AM EDT
[#19]
m1ajunkie, you might want to buy the same primer in a different lot number to avoid more primer failures. Within the last 6 month there were 2 incidents of defective primers online. Both in 44 mag with WLP being used. I hope everone knows not to use the Rem 6 1/2 in the 223/5.56. http://i338.photobucket.com/albums/n420/joe1944usa/Remington.jpg
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Posted: 10/8/2011 9:33:02 AM EDT
[#20]
Pin holes in the edge/corner of the primer cups usually refer to improper or defective primer cups. Seen a lot of different Mfgs have defects.
To be sure of what you have, punch out the primer and see if it's through the corner/side of the primer. High pressures usually swell the brass all the way around the cup and not leave pin holes. The pin holes shown in 308Panther's pics look more like defective cups. JMHO 'Borg |
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Posted: 10/8/2011 1:14:12 PM EDT
[#21]
I always used the Rem 5 1/2 SPM primers in my 40 S&W even against most peoples advise to use the 1 1/2's, looks like I was doing right by using the 5 1/2 primers and not the 1 1/2's.
Your not supposed to use the Rem 6 1/2 or the CCI-400 primers in .223/5.56, those primers are made for lower pressure rifle rounds. |
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Posted: 10/9/2011 8:49:12 AM EDT
[#22]
Here is a 7mm mag. with a primer photo. The bottom of the primer looks ok to me?? Link* http://i72.photobucket.com/albums/i193/jthibodeau/94b28580.jpg http://i72.photobucket.com/albums/i193/jthibodeau/99e9d234.jpg http://i72.photobucket.com/albums/i193/jthibodeau/d88ff228.jpg
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Posted: 10/9/2011 11:54:32 AM EDT
[#23]
Quoted:
I always used the Rem 5 1/2 SPM primers in my 40 S&W even against most peoples advise to use the 1 1/2's, looks like I was doing right by using the 5 1/2 primers and not the 1 1/2's. Your not supposed to use the Rem 6 1/2 or the CCI-400 primers in .223/5.56, those primers are made for lower pressure rifle rounds. Should I not be using CCI-400 primers in .223? I'm new to this as well and have read for months and haven't heard or found this info. |
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Posted: 10/9/2011 12:19:32 PM EDT
[#24]
 |
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Posted: 10/9/2011 12:53:43 PM EDT
[#25]
Lots of loads in here using the CCI-400 primers for .223.
http://www.ar15.com/content/page.html?id=206[/URL] |
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Posted: 10/9/2011 12:55:47 PM EDT
[#26]
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Posted: 10/9/2011 1:47:43 PM EDT
[#27]
looks like a defective primer to me.
'Borg |
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Posted: 10/9/2011 5:30:47 PM EDT
[#28]
Should I not be using CCI-400 primers in .223? For me, CCI-400's flow into the firing pin hole. I tried a few Rem. 7 1/2's , same load , no flow with them. The CCI-400's were on sale, normally i use mag. primers.
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