I've been shooting the 140 Berger, the 140 Accubond and the 110 TTSX. I have only taken game with the Berger and Accubond and I haven't taken anything over 400yrds so not real long range.
The 140 Accubond does a good job on deer, very accurate but a shot behind the shoulder will likely result a running but very dead deer. It does tend to blood shot a little more than I like, it will hold together very well through bone and is not the piece of junk the Ballistic tip is, it doen't open up as much as I'd like with a behind the shoulder shot.
We shot alot of Bergers this year and the 140 Berger in the 270WSM was awsome. It will clean a deer or elks clock. It reamed the cow elk, went in through the meat behind the shoulder and just started opening, punched through a rib then augered a hole the size of your fists through the heart and lungs, nearly zero blood shot.
I was apprehencive about the Berger so I loaded Accubonds as well but after this year I will only load the Berger. The Berger does not function like the Barnes but that has no bearing on weather it will kill or not, on the .277 Berger the worst I had was it going in and blowing the chest cavity to jello and farther out it did a slower gernade both in the center of the chest.
There BC of the Berger for long range is not about compensating for drop it is about windage and bullet speed, comparing a 140 TSX and the 140 Berger at 800yrds the TSX has 17.3 MOA of drop and 7.2 windage and it going 1545fps now the Berger has 14.8 drop, 5.3 windage and is still going 1822fps. The Berger has more leway for being of on a wind call and it is still going fast enough to fully function. The Accubond is very close to the Berger during flight but I don't think it will function at the lower velocities that the Berger will.
Load some and shoot a deer and see if you like how they work you may like them you may not. IMHO for what it's worth