Re: Anyone using hBN bullet coating?
I use it. It seems to work. Less friction - more powder need for the same velocity. Barrel does not foul very quickly. Sure has not hurt anything.
Re: 204 how far
I have also had blow ups on coyotes. Both were about 150 yards. The first was with a 35gr Berger and the second a 39gr Blitzking. I now only use it for gophers. My 22-250 or 6.5-284 gets the nod for coyotes now.