I've been using Ballistic Tips since 1985. They are great if you can get them into the lungs of a deer - drops them in their tracks. I've also been satisfied with Partitions on game up to the size of Wildebeeste and Kudu in Africa.

If you are getting satisfactory results with non-premium bullets, why change? If you want to experiment with premium bullets, go ahead. They'll kill game just as dead.