Since you're willing to sacrifice the barrel (if he messes it up) I think it's a great idea to have your son try to do the work... Isn't that what he's going thru the program for? I can't imagine it being any more rewarding to both of you, when it's done and shooting "lights out"...
I don't think the 22-250 AI is going to be much improvement for the loss of barrel life you will get. I shoot the 55 gr V-Max out of my 22-250 at 3300-3400 FPS... And that is not a max load... If you want to shoot heavier bullets maybe go with an 8 twist however.
Just my .02
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