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I figured that was too heavy/long of a bullet to be able to feed in a AR mag
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I don't see why. Sierra list COAL as 2.250 for the 63 gr which is similar to the 65 SGK. Sierra also lists 2.250 for all 55 gr bullets.
Here is a link to Sierra's 223/AR section:
http://accurateshooter.net/Downloads/sierra223ar.pdf