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Magazine capacity 6.8 SPC to 5.56

Discussion in 'General Firearm Discussion' started by ravencrofte, Feb 14, 2016.

  1. ravencrofte

    ravencrofte portland Oregon Member

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    Does anyone know how many 5.56 rounds will fit in a 5 round or 10 round 6.8 SPC magazine? What about the same with a 6.5 Grendel magazine?
  2. DirectDrive

    DirectDrive Vancouver, WA Member

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    Your question makes no sense.
    Each one of those rounds requires a cartridge-specific magazine.
    Mags are cheap now....buy the mags you need.

    Now here's some useful mix-and-match mag info for you....

    10 round 5.56 mag – 3 rounds of .458 SOCOM
    20 round 5.56 mag – 7 rounds of .458 SOCOM
    30 round 5.56 mag – 10 rounds of .458 SOCOM

  3. Roop

    Roop La Grande Active Member

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    The angle of the feed lips is a little different. 5.56s won't stay in a 6.8 mag, they all just come out on their own. I don't know about 6.5G, I would guess the same, since it's a fatter case than the 6.8. If you could get them to stay put, the mags are common lengths, my 25rd 6.8s are the same length as a 30rd 5.56, my 16rd 6.8s are the same as a 20rd 5.56. Internal dimensions, followers and feed lips differ from the 5.56 mags though.

    For going the other way, with 5 and 10rd 5.56 mags, I have fit 4 rounds of 6.8 in a 10rd pmag with a 5rd limiter, and 7 without the limiter. Any more than that and the rounds start to bind because of the extra diameter and slightly different taper putting loads on the follower.