My Marlin 336 straight stocked lever gun kicks the crap out me with 170 gr. loads. My .308 with 168 gr. loads shoots like a Red Ryder BB gun. Yes, I understand you don't want a kid flinching from recoil, but you don't want his or her first hunting experience to be a disaster loosing a wounded deer. Personally, I would try the kid out with the lightest bullet I could get in .308 (not load). Bullet weight, to my way of thinking, has more to do with recoil than how much powder is behind it. I would think a factory 130 gr. PSP would be mild if something like that is available. I was curious as to what State allows 8 year olds to hunt deer with centerfire rifles?