While we're chimin' in, I second the notion that you should pay careful attention to the fit of the gun to the kid. Scope eye relief fit to the shooter is critical when recoil is an issue, and many tend to put big, short-eye-relief scopes on magnums.

Once a rifle splits your eyebrow, you are likely never going to be friends with it again.... I speak as one who has "the moon" from a very early Weatherby .300 on an FN Mauser action that I test fired for a friend after he had mounted an early 3X9 variable on it. I love early Weatherbys, but not that one!