Steve,

I disagree with Pro-Line & frizzellr. Everyone has a right to their opinion, but I believe the 7mm Rem Mag is an excellent cartridge. Flat shooting and hits hard. The 7mm Rem Mag is easy to shoot if you get the right rifle (not too light). However, depending on the length of your shots, it may be a little too much gun for your situation. The .308 is also an excellent cartridge for deer size and even larger game for distances up to 200-250 yards. With the .243, you would be limiting yourself to deer size game and smaller. Out of these 3 choices, assuming that you are hunting deer at distances of 250 yards or less, I believe the .308 would be the best choice.