A .243 will be fine but he will grow out of it eventually. If it were me I'd get the 6.5 CM.

You'll hear a lot of trash talk about the CM because the caliber is so popular and for whatever reason the old school guys hate it. I bought a Creedmoor about four years ago and I've killed a bunch of big bucks with it since I started shooting it, and several of them were well over 200 lbs. Out of all the ones I've shot with it only 1 of them ran and he didn't go far, maybe 60 yards. I shoot Nosler Trophy Grade 142 grains out of my Christensen and it kills them just fine, and is suitable for a younger shooter because it has light recoil. You can suppress it and shave that recoil down even more.


"Some men are mere hunters; others are turkey hunters."

-- Archibald Rutledge