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Thread: 223/556 Primers

  1. #1
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    223/556 Primers

    Anybody have any strong feelings about using "MilSpec" primers like CCI #41 versus plain CCI #400 (or BR4) for 223/556 reloading to be shot out of a couple of plain Jane ARs and a Mini? Just fun range/tactical stuff, no precision or BR.

    I went down to my local reloading emporium and they only had CCI BR4 s in small (100) boxes and I didn't want to buy 1,000 at their prices. Got home and promptly loaded them. Is the risk of a slam-fire really that much greater with standard vs. MilSpec primers? I know (and don't care) that the BR4s are more consistent than the 400s.

    Fortunately, I came on a smoking deal soon thereafter for CCI #41 ($36/1,000 delivered in a group buy) so this won't be a problem soon.

  2. #2
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    Mil spec primer are absolutely not necessary. There's been a trillion rounds of commercial primers fired in the AR without a slam fire.

    If there is a slam fire... it's the gun... not the rifle primer.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  3. #3
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    Ditto on what markm said about standard small rifle primers in an AR.

    Reloading with large rifle primers for a FAL is a different story. I absolutely won't use anything except CCI #34s there.

    The CCI 34s are considered to be a magnum primer. Not sure on the CCI 41s, but I would consider them hotter than standard unless proven otherwise.

  4. #4
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    i use the cci magnum 450 in my ar's...
    "You cannot invade the mainland United States. There would be a rifle behind each blade of grass."
    Japanese Admiral Yamamoto, 1941




    "A wise man's heart directs him toward the right, but a foolish man's heart directs him toward the left."
    Ecclesiastes 10:2:

  5. #5
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    I use the WOLF SRMs for low reported velocity Standard Deviations.... other than that... anything that'll fit in the primer pocket works for me.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  6. #6
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    Quote Originally Posted by markm View Post
    I use the WOLF SRMs for low reported velocity Standard Deviations.... other than that... anything that'll fit in the primer pocket works for me.
    Same here WOLF SRM's at $15.50 a K, working really well for me too.

  7. #7
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    Obligatory recent Wolf SRM note about not using H335/SC844/846 etc with recent lots of Wolf SRM...


    (older lots like my 2007 ones are fine)
    • formerly known as "eguns-com"
    • M4Carbine required notice/disclaimer: I run eguns.com
    •eguns.com has not been actively promoted in a long time though I still do Dillon special
    orders, etc. and I have random left over inventory.
    •"eguns.com" domain name for sale (not the webstore). Serious enquiries only.

  8. #8
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    Indeed. If you like H335, don't buy the current WOLF primers.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  9. #9
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    Is the caution regarding Wolf primers applicable also to the Small Rifle 223 primer or only the Small Rifle Magnum?

  10. #10
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    BOTH from what I've read... but the SRMs are what I have first hand experience with failing to start H335.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

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