Leave it to Beaver to bring elk into a whitetail discussion. I agree with the ElkampMaster. 65 yards is a short shot and you could use any bullet weight, but you need to stick to the premium bullets.

Also the size of the exit hole does not tell the whole story. You need to look at the wound channel through the whole animal. The bullets mentioned all exceed the necessary energy to down a whitetail under 100 yards.

He is also right I think you should spend a little more time shooting but not at the range. You should put yourself in all different scenarios and practice those shots.