Ok this season i will be hunting deer and elk and i want to know what kinda ammo to use on a 7mag, iwas thinking about using the winchester superx el game and then a buddy of mine says that i should use the supreme loads but i heard taht the supremoes "mess" up your barrel and if it does that i don;t know what kinda ammo to use. And y grandfther said to use fedderal premium witha 160 grain! So my ? is do supremes mess up your barrel and what ammo out of these3work the best on elk and deer and have plenty of nrg at the distance???