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Pistol of carbine length gas tube?
Barrel length?
Suppressed?
These are the three biggest factors in working up or I should say working down subsonic loads. For supersonic loads these factors are less critical. Depending on the bullet weight and which barrel length I am running the powders I've had the most success with are H110/W296, Lil'Gun, 4227, RE7, and A1680.
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