With cast 151gr bullets my 1:12 twist 24 inch barrel is subsonic at 7.5 grains of Trailboss. My 1:8 twist 16.5 inch barrel is 8 grains.
I have some 190gr Sub-X loads but can't get to the range until level 2, I've started at 9 grains for them assuming they will need a bit more push being heavier and jacketed.
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