RE: Best Deer Hunting Caliber
I would say it depends on where you are and the type of hunting you do. But to me the most versatile rounds are the 270 and the 30-06 and my nod goes to the 270.
The only ones on your list I have problems with are I think the 300 mag (if that is what you meant) is a bit big for deer, but it will work. And the 22-250 is a little light. I am surprised you listed it in a poll for the BEST deer cartridge. But I believe it will work on deer with a well placed shot. If it was all I had I would use it without hesitation.
My personal favorite for my type of hunting would be the .243 though.
Paul