Welcome to the forum Quack Addict, Sounds like your friend isn' t sure what he wants.The 7mm Rem Mag is a flat shooting cartridge. It might be a little over kill at short ranges,but it will reach out and find it' s mark at several hundred yards..If the 7mm RM is over kill then the 300Win Mag is out of the question.I would suggest a 270 Win but he wants a bullet of .284 or better.I guess the balls in his court.
Ruger Redhawk