Billy,
For longer ranges, the 140gr NAB shot well for me. Bullet drop matched JBM out to 800 yards. I see Litz has recently tested the new 150 LRAB and found it had a G1 of 0.569 with 7-twist. With 10-twist it was 0.543... still pretty good but not that much better than the regular 140 NAB. Higher BC bullets in 0.277 would make the 270 even better for LR, but there's plenty of bullets for most hunters.
I like the 270 and have owned pump, semi, and bolt actions. It seems like a baby-magnum. Shoots flat enough with 130gr bullets that dotz aren't needed for the ranges most people shoot. Haven't killed anything with a 270 though.
Just need to be careful or else this will turn into "the 7mm RM is more uber"
Jason
