For what you are looking for I would recommend as others have a mid range .284.  I'm partial to the 280AI, it's a pleasure to shoot at 60 grains of powder and 162eldx or 168 Berger.  Factory ammo can be acquired and have taken elk out to 600 yards and a great mule deer cartridge.  Not a super hot rod 7 by any means but the big magnums just arent a whole lot of fun to shoot in my opinion.