If you are looking for American made - Ruger M77, Remington 700 with X-Mark Pro trigger, Savage 112 or 12 with Accu-Trigger, Winchester Model 70, American made Weatherby (some are not American made).

Imported - Browning bolt actions, Howa, Weatherby Vanguard.

You did not give the age of your son or his shooting experience. If this is for hunting, you may want to consider starting with a cartridge that has a slower bullet and not as long range (.44 Magnum, 30-30 Winchester) until he learns safety, when to shoot and is able to keep his composure while hunting.