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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.
While a 270 is not my first choice for elk, I have killed 8 elk with them. 3 nice bulls fell to a load using R-22 powder and the 150 Nosler Partition. One was a front on shot that penetrated 3 ft of elk before stopping. wound channel was very wide and deep. The elk jumped at the shot, and fell over. The range was 310 yds. The others were killed using the 130 gr. ttsx at 3175 fps. Ranges varied from 40 to 300 yds. While not as dramatic as the Nosler load, all were one shot kills, with none of the animals going over 100 yds. Wound channels were adequately wide and penetration was very good. I recovered two of the bullets while the remainder passed through. For my money, the 150 gr. Nosler partition driven at an honest 3000 fps from my 24" tube is about all the killing power that this caliber can provide.
I looked through the forum a little before responding. I didn't see much for the Barnes. I live and hunt in Southern Idaho and shoot Barnes exclusively. You mentioned the LRX 129. I load those rounds for both of my sons. They don't shoot elk at long range with them but they have each killed bulls and cows up to just under 500 yards with that bullet. One son has killed 5 elk. My other has 7. One is 17 years old and the other is 20. One rifle does better with Hidgdon hybrid and the other likes H4350. At the longest ranges of elk we have shot we still have not recovered any bullets. They are a through and through. My only advise with them is make sure you shoot bone or are very accurate because if an elk runs on you the bullet doesn't leave a large enough hole for a good blood trail.
Having shot all major brands and bullets in my new 270, I found Berger's Classic Hunter to be the most accurate for my rifle. I've found that a well placed shot is more important than brand of bullet.
I've had great results with the Nosler ABLR in my 7mm STW but loading for a buddy building a long range 270 and he is going to use the newly released Berger 170gr EOL (Extreme Outer Limits) just released but you have to have an extended magazine or Mag well, as they need to be out to the lans for accuracy and you need a 1:7 twist or better. I'm pushing them at 3,100 fps.
