Seems like a lot of money for something a Ruger American Ranch will do for a third of the cost. My Remington 700 SPS 7 twist drives a 1" group at 100 yards, realistically what more is there in the 300 Blackout than that?
I'd rather shoot my 30-30 than push a 300 BLK supersonic, but that's because to me the 300 BLK exists solely as a compromise for subsonic and AR-15 platform usage. I get some guys push the 110-125gn bullets fast, but to me that's in the range where 7mm-08 kicks into high gear and shines.