I know I'm going to open a can of worms with this one. I, personally, don't believe the .357 to be an adequate deer round in the hands of a kid.
Can he hold it rock steady on the vitals, judge yardage, etc. to place a killing shot? I assume an adult will be there to help with that.
Everyone wants to start their kids out with low recoilers, Me too, and I understand that. Kids get fitted out with .357s, .223s, etc. because they have light recoil. The big factor that's missing is that to be effective, shots with these calibers require shooting skills and control most kids don't have. I think the greatest factor of all is judgement, and the kids aren't mature enough for that. Add to that the shakes that come with the first deer in your child's sights, and you have a possible disaster of a wounded first deer. A friend of mine's son just went through that this past season, Yeah, I found the deer....three days later after wolves, coyotes, ravens and eagles had been there. It wasn't pretty.
Yes, I carry a .357 Blackhawk all the time hunting. Perhaps one day I'll have a twenty yard shot at Da Tirty Point Buck from my tree stand, but mostly I carry it for a final shot on a deer if needed. I own lots of marginal deer caliber rifles from .223 to .357, but I don't hunt deer with them. The ones I use are medium to big bore deer killers that pack a solid punch. I'm also an old man, not given to tracking wounded deer anymore. If it ain't gonna drop right there, I don't shoot.
Patty and I had just moved into this home 23 years ago, and a neighbor, now a friend, came to the door with his grandson. The purpose of the visit was to ask permission for the grandson to track wounded deer across our property. The kid was hunting adjacent land with a .357. Pardon the French, but my wife, Patty is a pisser. She said words to the effect that if you don't think you can cleanly kill a deer with that rifle, you shouldn't be in the woods with it......Ya know what?.....she's right.....she also hunts and shoots and knows what her guns can and cannot do...a couple of .357s included.
Pete