I used to work with a guy that swore by a Ruger PC carbine in 40S&W for deer. He said it would drop them on the spot. I know the 10mm makes an excellent deer gun, but the 40? Personally it's not for me but if it works and it's legal, I'm all for it.
My deer gun this year will probably be a Contender carbine in 30-30. I'm gonna try some leverevolution and see how it groups. If it shoots well for me than I'll be good to go.