The loads I’ve tried are all heavy bullets for caliber 220gr amax, 230gr Lee cast, and 240gr majestic powder coated.

the latest was the 230gr lee cast with charges varying from 9.1 to 10.7 grains. Chrono data below shows a comparison with set 6 being the 240gr majestic with IMR 4227 at somewhere in the neighborhood of 9.5gr

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The rifle is a 9.5” SBR, ballistic advantage barrel (pistol gas, port opened to 0.100” for improved cycling), standard weight buffer, standard carbine spring, form 1 6” suppressor (baffle type).

I’m mainly just surprised at how dirty and loud it is compared to 4227 though. After going though those 30 rounds (5 groups of 6 shots each) it felt like there was sand all over the bench I was on, which I’m assuming was just unburnt powder. And I had to put my ear pro back on even with the suppressor.