I have a number of rifles with 1:9" or faster twist, and they all handle the HDY 75gr HPBTM. A very accurate load of 23.7gr of Varget, CCI BR-4, in PPU brass, OAL of 2.260" seems to be about optimal in all of them. This is listed in the current Hornady manual as a max load, and its beginning to look like a generic load in my guns; Stag Model 6 24" Super Varminter, CMMG 16" Bull WASP alternate upper for the former, 20" Mossberg MVP Predator, and Savage 24" 11VT. Cycling and pressure signs appear tolerable.
I have attempted to duplicate this performance with BR-4 reprimed TulAmmo steel Boxer cases (which have a reduced case capacity of around 2gr less powder, and should be treated as a completely different smaller chambering), and the winner (at 100yd so far) seems to be 22.0gr-22.2gr of Varget, all other components being the same. I have some reservations regarding additional distance with this load, it may shoot equally small at 100yd, but I doubt the trajectory curve will match the other load. So far, this load will not lock back the BCG on the last round, but otherwise shoots nicely from bolt rifles.
Greg