Standard 20 gauge shells are the perfect balance especially with the newer recoil pads out there now. WHile the 410 seems nice in theory, the problem with it is the skill level neccesary to hit anything. You want the child to be able to have a bit of success and thats much easierwith a 20 gauge. With a 410he is going to miss quite a bit and higher success rates mean more enjoyment and a greater chance he will stay with it.Also, the 20 gauge can be used for everything from pheasant and turkeys and ducks to deer with the loads now available which hopefully the child will want to do as he getsmore experience, while I consider the 410 a specialized load, that is at most a squirrel gun and probably at its best as a real niche toy for shooting clay birds.As a hunting gun it just doesn'tcut it except for the most skilled shooters and certainly not a young child. Also the typesof ammo and availablity for the 20 gauge is lightyears aheadofthe 410. Take care and good luck with whatever you choose.