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5.56 casings

Discussion in 'Ammunition & Reloading' started by Janes, May 14, 2014.

  1. Janes

    Janes Enid, Oklahoma Member

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    When I was at the gun range today I picked up some 5.56 casings. All of the casings are longer than my 223 so should I trim them the same length? Also when I reload them should I use the same amount of powder as when I reload the 223?
     
  2. DieselScout

    DieselScout S Clackamas County Well-Known Member

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    What is your rifle chambered in? How much is "longer"?
     
  3. My 3 sons

    My 3 sons Bonney Lake Active Member

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    First is your rifle chambered for 5.56 or .223?
    The reading I've done says there is a difference in the shoulders between them. This is why it is recommended to not fire 5.56 through a .223 chamber. I've never owned a .223 weapon only 5.56 so I'm sure others will have more info than me.
    As far as trimming and loading I size and trim my brass for both the same. You can see some variation in case volume from one brand to another though especially if you are loading hotter loads.
    The first rule I've always seen the old timers give is start slow and work it up.
     
    evltwn likes this.
  4. Janes

    Janes Enid, Oklahoma Member

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    My gun is chambered for the 5.56
     
  5. DieselScout

    DieselScout S Clackamas County Well-Known Member

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    Is the length out of spec for a 5.56?
     
  6. Janes

    Janes Enid, Oklahoma Member

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    I haven't found any spec. For the 5.56
     
  7. DieselScout

    DieselScout S Clackamas County Well-Known Member

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    Quick Google search says 1.740"-1.760"
     
  8. AMProducts

    AMProducts Maple Valley, WA Jerk, Ammo Manufacturer Silver Supporter

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    Guys... .223 and 5.56 have identical cartridge dimensions, the only difference is the pressure tolerances, 5.56 pressures are always higher than for .223. The major physical difference between the two is the 5.56 chamber has a looser throat to lower the engraving force of the bullet.

    So to answer your question concisely, trim your brass to the same length!
     
  9. Janes

    Janes Enid, Oklahoma Member

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    These are a little longer than 1.760. So should I trim all the same length as my 223 so the bullet would be seated same as the 233
     
  10. circlepranch

    circlepranch Battle Ground Wa Active Member

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    You will notice different info in reload manuals, trim cases to 1.75 then seat bullets any where from 2.20 to no more then 2.26. I have settled on middle ground of 2.23 plus it easy to remember
     
  11. AMProducts

    AMProducts Maple Valley, WA Jerk, Ammo Manufacturer Silver Supporter

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    I trim to 1.745" and load to an OAL of 2.245". 2.26" is the max COL, and usually if you're longer than 2.255 you can have feeding issues in AR's and some rounds won't fit inside the magazine or won't feed reliably.

    I cut all brass to the same length so when I'm crimping it I get a nice uniform crimp.
     
    2ndtimer likes this.