Well I would go with rifle number #2. While the scope is on the large end power wise for my tastes, it would serve you well. Start with plain Blue Box Federal 7mm Remington Mag 150 gr bullet weight. Zero your rifle spot on 200 yards and just go shoot some till you can hit a grape fruit as far as you want to shoot and go enjoy yourself. That other rifle is a hanger queen. I would buy it myself if I was in the market for a rifle and yea I would even keep the current scope on it. Thou I am more of a fixed 6 x guy.
