The 270 Winchester was my only hunting rifle for 20 years and currently I hunt with a custom 270 WSM in a browning long action that I modified from a 7mm long action. Long story short, I have a lot of experience with .277, deer and elk. I have shot multiple Elk with 140 grain bullets and have great confidence that they are adequate with good shot placement, however I have grown quite fond of the Nossler Accubond LongRange in 150 grains. The BC is the highest in class and it is super accurate at 3000 fps and higher. I am loaded at 3100 FPS using H4831sc and shoots 3/8" groups at 100 yrds. Every deer I have shot dropped in its tracks and both elk were on the ground in a few yards. I also run the 270 with H1000 but was having a hard time finding any so I developed the H4831sc load, the accuracy is almost identical at 3100 fps. I have validated the BC and speed to 1000 yrds with both loads. Because the bearing surface on the 150 grain Nossler ABLR is about the same as most 140 grain bullets you should be able to get very close to the same Muzzle Velocity from them. They hold together quite well and destroy the vitals before exiting on an elk if you shoot behind the shoulder. I am a meet eater and never shoot the shoulder. I shot two does this year at 465 yards and both dropped on impact from a double lung shot. My point is I am an advocate of shot placement and speed over extreme weight and wasting meet.