they work, part of Barnes R&D program sold to customers to experiment with )
Barnes have gone through quite a transition over the years
The blue coating leaves a bit of fouling in the bore, but not extreme
Trouble was it took a few shots to foul enough for a consistent velocity and poi IMHO
start using them then only a minor boar wipe
I still have 50+ 338 loads ready to go, finally shot off all the -06