.300 Win mag. Not because I needed the power but because it's always been my go to rifle that doesn't seem to miss. I hunt with several others but when the fun is over and it's time to get meat, the .300 always comes out.

I know you didn't ask but second place would be a tie probably between .280 Rem and 30-30, maybe a slight edge to the .280 since I haven't killed with the 30-30 in a long while. I might have to change that for old time sake.