Any and all will work. Last I checked, which was a long time ago, the 165's were typically boat tailed and dropped roughly the same as the 150's with a flat base at longer ranges. The trajectory difference is probably not worth mentioning, and the terminal performance with a good projectile is likely to similar.
In the 'olden days' guys would shoot 150's for deer and antelope and 180's for elk and bear. I don't think you can go wrong doing that, but it is not really needed with modern bullets. I will admit that the 165's strike a sweet spot, but I believe that is mostly a gut feeling on my part and is not based on any rational analysis. Whatever the reason, I do like the 165's. In any event, I would shoot what your rifle likes.