In brief chat with a Sierra rep. some time ago I was told the 175 MK was evolved for distances over 600 as the 175 would remain super sonic at 1,000, out of common ordinary .308 rifles and the popular 168 MK sort of fizzled out at 800 - this was prior to the advent of pointy plastic bullets. My brief exprience with 1,100 yard targets shows that the 155 Barnes Match Burner would get out there but that was on a warm day at 3,000 ft with real peppy loads close to 2,900 fps with IMR8208. Palma matches go out to 900 & only max weight of 155 are allowed.
Looking at my onhand assortment of powders & bullets I would probably use 178 H ELDM's & CFE223 or TAC. I would prefer Varget but U gotta use what U have. A look at the Hornady 4DOF calculator might help.