RE: best bullet and weight for 270 whitetail hunting
I've used a 270Win for over 30 years, on everything from moose, bear, caribou, sheep, goats anddeer. Have had good experiences with 150gr Nosler Partitions, standard core-lokts in both 130 and 150, and140grCore-Lokt Ultras. My newest 270 shoots them (140gr CLUs)very accurately. If you are just after deer, it is hard to beat the good old 270win. Perhaps you should try several different factory loads to determine which your gun shoots the best.