Thread: .300 Whisper OAL for semi-autos?
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Old 03-14-2010, 09:08 PM
rsilvers rsilvers is offline
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Join Date: Mar 2010
Posts: 482
You should not exceed the length of 5.56mm NATO ammo as that is what the mags are designed around.

The length is 57.4mm which is 2.2598 inches.

I personally load to 2.245 - 2.250 to ensure there is never a problem with an out-of-spec mag.
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