8.6 Blackout....here we go

Converted from Federal small primer 6.5 Creedmoor brass. 300gr subs atop Shooter's World Socom SBR. No load data to go off for this powder in this caliber, but burn rates fall right between tried and tested powders that are regularly used for 8.6 BLK subs. Working up from very low powder charges to measure velocities in 3 shot groups stepping up .5 grains at a time. Let's see what we get. Photo in comments.