I agree that that the gun and recoil must be taken into account for a youth hunter. Recoil is influenced by barrel length, powder and bullet size. Not sure that a 140-150 gr bullet will have more recoil than a 120 gr out of the same rifle. Depends on the powder charge, barrel length, brake/suppressor, and resulting velocity out of the barrel.So why increase recoil by upping bullet weight? Everyone shoots lower recoiling rifles better. Theres been some really good threads about kids rifles and calibers on here
Kids rifle manifesto
I've chimed in on so many different "what rifle for my age XX kid?" threads that I thought I'd try to consolidate my thoughts here. My oldest son is 14 now, started shooting centerfire rifles at 9. My younger kids started shooting centerfire rifles at between 5-7 yrs old. 5 kids shooting now...rokslide.com
that have really good information if you can have an open mind and not be stuck on the idea that elk are armor plated.
Some more here specifically on the 120 nbt
Help me decide next steps for my 13 year old
Ok, long advice post so be forewarned. @Formidilosus I would especially like your input on this. My 13, almost 14 year old son has a somewhat cobbled together setup, a 7mm-08 Ruger American compact with a SFP 2-10x Minox ZX5. I handload 120 Ballistic Tips for it. He shoots it well enough, but...rokslide.com