I would use a NON Premium 180 grain bullet. Premium bullets on deer are often to tough to expand well. Without any doubt if I were to use the 300 Mag on deer, I would use the 180 grain Ballistic tip. I used to use a 700 Remington in 300 Win Mag for deer and I also had good luck with the 180 grain Hornady innerlock. I have gone back to the 308 as a Max deer gun and often use the 250 Savage along with the 6.5x55 and 270.