Trimming .223

Discussion in 'The Ammo & Reloading Forum' started by Craig Sayner, Mar 20, 2017.

  1. Craig Sayner

    Craig Sayner Member

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    When trimming 5.56/223 case length should be trimmed to 1.75. I allow it up to 1.752, anything above that I trim. How much tolerance below 1.75 can you allow before it's unsafe to load and throw the brass away? I have never heard anyone say how much tolerance is allow above and below trimmed case length.
     
  2. dbcooper

    dbcooper Well-Known Member

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    Make sure that you trim, after you resize.

    .223 brass should be trimmed to 1.750 max length is 1.760

    I find lots of once fired brass under the 1.750, most of it being in the 1.745 range
    Its fine to load it up and use it. But I use it for plinking and not precision.
    As to your question, personally if I find anything under 1.740.. which is rare, I toss it in the recycle bin... but that is my personal preference

    after a few firings and resizings, it will lengthen out
     
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  3. slayer

    slayer Well-Known Member

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    If you get a quantity of those under 1.740 send me a PM.
     
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  4. Killshot1

    Killshot1 Active Member

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    As he stated. 1.75 is a perfect trim, but you can let it go up to 1.760. I actually JUST started loading my first set of .223. I set my trimmer at 1.75, id say most just hit the 1.75 target, but some fall short to ~1.745, which is fine. As he stated above, 1.74 you could toss it, personally I'd probably try to resize it again or just use it. Some users on here have shot shorter casings.

    Either way, I trim every single 223 case I'm going to use, even if its 1.752, reason? The closer tolerance your cases are in, the better group you may get, marginally. This is why some extremists even separate by head stamp, etc. But personally I see no need!
     
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  5. Pawpaw40

    Pawpaw40 Well-Known Member

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    I agree with DB, except if it is short I convert it to 300 BO. You can send me any short ones.
     
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  6. howlnmad

    howlnmad Well-Known Member Supporting Member

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    I'd load cases at 1.140 all day long. I prefer them longer but I still use them.
     
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  7. Hammerman

    Hammerman Active Member

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    The SAAMI specs for the 223 are 1.760 - .030.

    So any case length from, 1.730 to 1.760 is within SAAMI specs and is safe to load and use.
     
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  8. Twicepop

    Twicepop Well-Known Member

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    For my bolt gun I've loaded them as short as 1.735", with no issues.
     
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  9. Hammerman

    Hammerman Active Member

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    and you shouldn't have issues as you are still .005 longer then SAAMI minimum.
     
    Last edited: Mar 20, 2017
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  10. 76Highboy

    76Highboy Well-Known Member

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    Bingo!!! I trim my cases back to 1.740 for the AR-15. Any further than that and I find a little bullet set back. With trimming to 1.740 I only have to trim once.

    Highboy
     
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  11. Don Fischer

    Don Fischer Well-Known Member

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    I separate all rifle ammo by head stamp. If you don't your gonna end up with a box of ammo with case's differing in volume. Heavier case's do have different interior sizes. Not enough to blow up your gun but enough to effect the accuracy pretty bad.
     
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  12. soundguy

    soundguy Well-Known Member

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    Agreed, about the same here. .01 short and I'll load and shoot it on a bottleneck case.
     
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