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took a stab at it today with some test loads in SR 4759. 8.5" barrel, pistol port, pistol buffer (heavier than carbine) with an H buffer.
50 degrees, 65% humidity, shooting with the can on
IMR SR 4759
Hornady 225 BTHP
9.0gr 985.2 fps, 985.6 fps
9.5gr 1006fps the other rounds didn't read on the chrony
Neither cycled or ejected, but came close to ejecting. It sounded fairly quiet though, not trailboss quiet, but quiet.
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