Tough to make a decision based on one example. I have seen "premium" 180 gr bullets from .300 Remington Ultra Mag not exit on small doe whitetail and a premium 200 grain bullet not exit on a broadside shot of a fork Muley buck. That being said, there is nothing wrong with wally-world 150s in the .270. I would recommend the 150 gr. Remington Core-loct load. It's a roundnose, but still shoots reasonably flat.
-Lou