RE: in your opinion, the best deer hunting caliber...
The 30 calibers probably offer the most versatility in bullet selection. A lot of deer hunters like the light recoil of the 28, 27, 264, and 25 calibers though. I personally like the increased frontal area of the 338 caliber bullets which I believe offer a little more thump than the 30's. I guess there isnt a best one or we wouldnt have so many to choose from. Get one of each and try them out.