This past deer season I ran the 170gn Berger's in a .270Allen Magnum at a conservative 3300fps. This load (93.0gn, US869) is probably near the bottom/starting but is pretty effective. Took a nice 6pt whitetail this year with it at 603yds. Boom, flop.
During the 2016 season I was using 97.5gn of 869 (don't have chrono speed for that) and took a meat doe at 250yds; the entrance/exit holes through the ribs were both golf ball size. No tracking just devastation.
I haven't done a lot of experimental load development with it but plan to try some of the different bullets (and maybe powders) this year. I've been told that the ABLR won't stand up to the speed/RPM's this round produces due to their softness but the regular AB's and Ballistic Tips will. I know the Ballistic Tips will and very nicely. I tried some 140gn NBT's, forget the load know, and ten rounds made one ragged hole at 100yds, but at over 3700fps! Anything mono metal will work. Powders, I have to be careful with due to possible powder bridging. Maybe some Retumbo, RL33, RL26, RL25 or Viht's 24N41, 20N29 or the newer N570 (if I can find any of them).
I still have a box of the Wildcat 169.5gn ULD RBBT and they actually shoot tighter groups than the 170gn Bergers but again, that is will limited load development.
All in all, this is probably the biggest, baddest rifle I will ever own and every time the sear breaks, whether on paper or deer, I get a smile on my face. Long live the .270!