When Sierra was closing out the 85 HP I bought around 1000 of them for $25/100, shipped. Heck of a deal. Bad BC but fast, and explosive, and accurate. They load good in the Grendel. I have shot lots of coyotes and lots of pigs with them. Really good on coyotes, a little soft on big pigs but still work OK. A really good night/thermal bullet IMO. Too bad they dropped it.
The 85 HP loads good in the Grendel too. I like the 90 TNT as well, but, due to ogive length and magazine length restrictions it is a little tricky loading it in the Grendel. There is a very narrow OAL that works and that is about it. It is not quite as soft as the 85, still opens great on coyotes but better on pigs. And I am a fan of the 95 VMAX in the Grendel as well. It works good all around. Those are the 3 bullets I use all the time in both of my Grendels for night work.