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.223/5.56 primer&casing questions

This is a discussion on .223/5.56 primer&casing questions within the Reloading forums, part of the Firearm Forum category; Ok guys with the help I've received from the much more knowledgeable folks here and ALOT of reading I know I can make holes in ...


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Old May 11th, 2017, 10:52 AM   #1
 
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.223/5.56 primer&casing questions

Ok guys with the help I've received from the much more knowledgeable folks here and ALOT of reading I know I can make holes in paper and loud noise !! So now to tune it in a bit and figure what's going on??? 1st- if the brass chambers in both of my rifles, one being a Stag Mod1 5.56 and the other a Rem 700 SPS .223 why do I need to separate my brass? Military, Federal, Winchester ect..? Next I've shot a quite a few rounds through my AR with mixed brass, 25gr of Varget ,CCI #400 primers, case trim length 1.50 and COAL 2.26 with a Nosler 64gr SBS sitting on top. ( This load for the purpose of hog hunting) I've changed the trim length to 1.55 and the COAL to 2.19, and have started crimping my AR rounds. the reason for the length changes is so I can get into the cannalure. BUT on my last test shooting season I have 4 blown out primers, 5 black firing pin strike marks on different rounds.. Did my changes make this happen?? and why? And one primer that instead of having a dent from the firing pin it has a sharp nipple sticking up from where the firing pin hit?? All different head stamps too?? A couple LC, a few Federal and some Fochii? I've stripped my rifle and the checked the bolt, carrier and chamber for any damage but all seem good and I shot some factory ammo yesterday to che function and accuracy. All seem fine.. no different sounds, recoil, smells when this took place..



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Old May 11th, 2017, 01:26 PM   #2
 
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Always use Remington 7 1/2 or CCI Military primers in this caliber
based on experience such as you mention long ago
and desire to avoid SLAMFIRE issues in semautos.
If you have firing in dent punctures using THESE primers,
you DEFINATELY havan over pressure problem of some kind!

Modern experience of others seems to be way different
(many other brands/types verk Just Fine in .223 Remington cartridges)
so maybe GONRA is waaay beind the times (as usual).
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Old May 11th, 2017, 02:01 PM   #3
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28points*, According to the Nosler reloading guide, 25gr of Varget is a max load with their 64gr bonded solid base bullet. The recommended COL is 2.175". Case length should be 1.760". Something just doesn't add up .... you said your case length is 1.50 ... I don't think that is possible probably a typo. Your COL of 2.26" is text book for 55gr FMJs bullets but I think even 2.19" is too long for those 64gr Noslers. If the bullet it touching or is too close to the lands, you will experience very high chamber pressure, which is likely why you are having issues with your primers.

My suggestion .... back your load off about a half grain to 24.5gr. Set your bullet seater for a COL of 2.175 and I'll bet chamber pressure will drop and primers will be fine.
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Old May 11th, 2017, 03:34 PM   #4
 
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Iowegan.. your right it was a typo on my trim length, my case trim length is 1.755. And again thank you for the advice, the charge will be backed off and I will tighten up the COAL.
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