So I've decided to buy a 700, the only problem is I don't know which one I should pick. 90% of the time I will be using this gun for target shooting anywhere from 100-600yds(and maybe someday 1,000yds), the other 10% will be hunting deer and elk. My coworker who is an experienced hunter and target shooter suggested the 7mm mag, but I've read online that there are better calibers for the job. My budget is from $500-$800. Any advice will be appreciated.