I tried this bullet for my work, which is hunting coyotes full time. In two nights I killed 8 coyotes and two badgers with it. Of those I had to shoot 3 coyotes and one of the badgers more than once. All of the shots that required follow-ups were what I would consider very acceptable hits on the first round. I abandoned the bullet and ordered some maker 200 grain REX bullets, but been waiting on a shipping snafu for new brass. It came in yesterday, so hopefully I'll find a load quick and get the 300 blk back into the field for another test run. I like the concept, but am not convinced for my uses that it is superior to a supersonic but suppressed 22-250.
One thing that suprised me, the sub-x would ricochet like crazy even after a pass through shot on a coyote. I wasn't too suprised they were bad that way shooting paper, but I didn't expect that after shooting through an animal. So be careful, this bullet does some wierd stuff.