.338 over the 7mm Mag as your next. Better at shoulder busting (elk etc) should it come to that specific usel--come to think of it the .300 WM also better at that; otherwise covered well by the .308 re most anything else the 7mm can do. 7mm not "enough" of a step from what you have, esp if the .308 is in a 22-24" format vs a shorter (18-20") "carbine."