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Author Topic: 5.56/7.62 specific primers  (Read 3029 times)

cpaspr

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5.56/7.62 specific primers
« on: August 24, 2010, 04:31:20 pm »
A simple glance through the recent topics shows that I recently acquired a Mini-14 and that I intend to reload for it.

Here are my latest questions:

Why does CCI make 5.56mm military specific primers?  Are they harder/softer than their normal primers?  (Ditto on 7.62mm military large rifle primers.)

If CCI makes these harder/softer/hotter for the military rounds, why doesn't anyone else?

Should I get the "dedicated" primers, or are all brands acceptable?  If all are acceptable, are there any I should avoid for this gun?

Thanks in advance.
Oregon

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    JesseL

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    Re: 5.56/7.62 specific primers
    « Reply #1 on: August 24, 2010, 04:37:11 pm »
    The military primers are harder to avoid slamfires in rifles with free floating firing pins.

    For most primers this isn't really an issue, though I've heard that Federal primers are soft enough to cause problems.
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    dstocum

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    Re: 5.56/7.62 specific primers
    « Reply #2 on: August 24, 2010, 05:02:03 pm »
    I believe they're hotter as well, like a magnum primer, but don't quote me on that.

    In my opinion and experience, especially hard primers are not required in military pattern rifles. I've only loaded much for the M1A/LR-308, but I use regular CCI large rifle primers for them and while I get light dimples when I chamber a round (the dimple is worse with the LR-308), I've never had a slamfire and I've seen the exact same dimples in military ammo with an M4 and in milsurp ammo in my M1A, so it's not worrying.

    If it makes you feel better, buy the military primers. I don't worry about it, and I've never had the opportunity to buy any CCI 34 or 41 primers anyway. But then I don't do things like thumb a round into the chamber and drop the bolt on it, which is about as fast as you can get the bolt going and the most likely way to get a slamfire. I mostly hear about the slamfire risk in the context of reloading for the match M1A, which is exactly where that sort of single round loading would happen.

    Oh, one last thought. Make sure you seat the primers flush with the case head. Any protruding primer would be a much greater slamfire risk, whether you had a floating firing pin or not.
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    mnw42

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    Re: 5.56/7.62 specific primers
    « Reply #3 on: August 24, 2010, 08:37:25 pm »
    The Mini-14 has a Garand/M1 Carbine/M14 style bolt that cams the firing pin away as the bolt closes making slam-fires extremely unlikely.

    If you were loading for a MAS Mle. 49 or SKS that would be a different story.  I use CCI #34s for my MAS after having it run on me.  That relieved a lot of stress ;)
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    Re: 5.56/7.62 specific primers
    « Reply #4 on: August 25, 2010, 02:38:02 am »
    They are both harder/thicker cup vs. a "standard" primer as well as being rated as a magnum primer.   I use a lot of them for semi-autos, and I even use the large version in 30-30 loads as another safeguard in the tube fed magazines or the lever actions.
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    cpaspr

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    Re: 5.56/7.62 specific primers
    « Reply #5 on: August 25, 2010, 02:27:30 pm »
    Interesting on the 30-30 use.  I'll try to remember that if ever I get another one.

    If I'm understanding the general consensus correctly, for my purposes, I can use either for the Mini-14, but the military primers will be a bit hotter.

    Do I want hotter?  I guess it depends on which powder I end up using.
    Oregon

    THE NORSEMAN

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    Re: 5.56/7.62 specific primers
    « Reply #6 on: August 26, 2010, 01:46:56 am »
    Bingo.  As a general rule, magnum primers for ball powders, standard for stick or flake powders.  There are exceptions to this, so always check a reloading manual.  I like the magnum burn rate on the large ones, as I use ball powder(H335) in my 30-30 loads.  Much better chrono numbers over standard primers, especially in cold temps.
    This may be considered as the true palladium of liberty. . . . The right of self defence is the first law of nature: in most governments it has been the study of rulers to confine this right within the narrowest limits possible. Wherever standing armies are kept up, and the right of the people to keep and bear arms is, under any colour or pretext whatsoever, prohibited, liberty, if not already annihilated, is on the brink of destruction- St. George Tucker, Blackstone's Commentaries

    THE NORSEMAN

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    Re: 5.56/7.62 specific primers
    « Reply #7 on: August 26, 2010, 01:48:48 am »
    Quote
    Should I get the "dedicated" primers, or are all brands acceptable?  If all are acceptable, are there any I should avoid for this gun?
    Careful with Federal primers.  They are considered the softest, and usually the most sensitive.
    This may be considered as the true palladium of liberty. . . . The right of self defence is the first law of nature: in most governments it has been the study of rulers to confine this right within the narrowest limits possible. Wherever standing armies are kept up, and the right of the people to keep and bear arms is, under any colour or pretext whatsoever, prohibited, liberty, if not already annihilated, is on the brink of destruction- St. George Tucker, Blackstone's Commentaries

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