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223 Whisper
I have experimented with shooting 69 grain match bullets with a 1:7 twist AR, you can make them go subsonic but I never could say for certain that they wouldn't tumble out of the muzzle. I wouldn't recommend risking your 223 can on this experiment.
I would recommend the 300 whisper though with a 1:8 or faster twist and Sierra 240 grain or if you can find some 250 grain HPBT with a 308 can. Better ballistics and safer for your can.
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