If you've been on this site for a while, or any other hunting site for that matter, you'll see this questions comes up from time to time. This question often generates a lot of responses and opinions, even a friendly argument or two. My answer always is that my rifle is the best..... for me. The best gun for deer hunting, or anything else, for you is the gun that YOU shoot best. Of course, the caliber must be adequate for the size of the game animal and the normal shooting ranges that are encountered, and, of course, it has to be a legal caliber. Other than that, I don't believe there is any one caliber or action that is the "best" in an absolute sense. Some relatively small calibers have killed some mighty big animals over the years, and the action doesn't matter that much if you get that first shot where it belongs. The most important thing is that the hunter is confident with the gun he or she is holding, and that comes from experience at the range and in the field.