All the calibers mentioned will work on deer, if the shot placement is good and none will work if it's bad. Having said what you all know already know, I think it is a matter of personal preference. I like the 7mm rem mag, my reasons are that I also hunt mule deer and Antelope with it and the cartridge has enough energy and is flat shooting for the farther shots. I try not to shoot any more than 500 YDS but when you get out to 400 to 500 yds I think the 7rem mag allows for a little more tolerance of a non perfect shot and still killing humanely.