If I had to pick one it would be the .430 300 grain Hornady XTP in a green harvester sabot. Most any fast twist rifle will shoot these well. They can be found in some stores and on line. They are cheap to practice with. And although I never shot a deer with one yet.. I have seen the reports of others and it is a very impressive bullet for deer.

For anything larger it will be a 460 grain .5045 conical bullet.