Going to get a chance to hunt in Wyoming in October. Trying to find a one caliber rifle to hunt elk, deer and antelope. I'm from Hawaii and never hunting on the mainland before. I"m thinking of getting either a 7mm remington or a 300 WSM. Any recommendations and which would be the better all around caliber for that type of hunt. I know we have alot of walking to do and also some long range shots for the antelope. Also, any recommendations on a scope? What power? Thinking of getting Leupold VX6 3-18 power.