RE: I want an explosive bullet when it hits the deer!
Try 300 grain JHP in your favorite 45-70. Your not going to get much more explosive than that. Consider the fact that these rounds are already close to half an inch in diameter BEFORE expansion! Most of the rounds that have been mentioned are lucky to get that size AFTER hitting.
If your range is going to be within 200 yards you're not going to find much better.