5.56-.223 POI shift

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  • DTitus
    Unwashed
    • Jul 2016
    • 5

    5.56-.223 POI shift

    So my last trip to the range I took some American Eagle 5.56 m193 spec and some various 55 gr .223 ammo by American eagle, monarch steel cased, Tula steel cased and Hornady 75 gr hpbt. My optic is zeroed for the m193 so I'm hitting dead center at 100 yards. With all the .223 however, it's shooting about 8-10 inches high and to the right. Does anybody know why this is and if it's normal? Thanks in advance guys.
  • rabiddawg
    Chieftain
    • Feb 2013
    • 1664

    #2
    Different powder, different projectile, different primer etc. etc.

    556 and 223 are technically not the same. 556 is a higher pressure round iirc. Isn't the rule of thumb you can shoot 223 in a 556 chamber but 556 in a 223 isn't recommended?

    I would have expected a point of impact shift but not 8-10".

    Here is a good read
    Last edited by rabiddawg; 05-04-2017, 04:09 PM.
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