I'm in the market for a new rifle for some long range hunting. I was seriously considering having a 7mm ultra mag built but just came across a smokin deal on a remmington 338 win mag for 375 including scope. I was wondering how the 338 performs in the real world of long shots. The gun currently has no brake but will sport one if I decide to go with it. Any feedback on the 338 vs 7mm ultra would be appreciated. I plan on using it for elk out to 650 yds.