Re: 7X seems like even less
Well, I'm guessing you're not trying to snipe ground squirrels and gophers with a .338 RCM, I assume you'll be hunting game that's at least deer-sized and larger
so you really won't NEED lots of magnification.
If you intend to hunt big game at 400 yards or less, then 7X should be enough, but it's always better to hunt with what you're comfortable with. If that means trading the 2-7 in for a 3-9 or even a 2.5-10 then so be it.
When optics first became popular, the best "all around" choice was thought to be a fixed 2.5X or 4X. A 6X scope was for loooooong shots in wide open country. No sane person ever thought of using such ridiculously high powered scopes as 10X or more.
Oh how things have changed...