Re: 308 bullets
Whichever you can get the best accuracy from. Any bullet will do since you only need to transfer a small amount of the energy created by a .308 to kill an animal that weighs around 50 lbs or less. The determining factor will be whether or not you can put the bullet where it needs to go.
Good luck. Let us know which you choose.
If at first you don't succeed, shoot, shoot again.