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Old April 8, 2021, 11:36 AM   #21
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Join Date: November 18, 2005
Location: On the Santa Fe Trail
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Originally Posted by stagpanther
Getting back to the OP's original question--the problem I see with what he's asking is using a short-shanked bullet which I would assume creates a lot of unoccupied space in the case if getting the loads subsonic. 
Trail Boss powder would probably do it, but then the issue is cycling in an AR which was the OP's other concern. If I had some TB I'd load it up and run it through my Ruger Ranch rifle and tell you how slow they were. M1 Carbine 110 grain bullets are cheap, but there isn't a whole lot of difference between spitzer 110 grain bullets and 180+ grain bullets suitable for subsonic loads.
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