This is why I feel the .357 Handi is the best deer rifle for a youngster.
You can let them shoot .38's all day long and you won't beat them to death, and cause them to develope the "flinch" and it helps build their confidence, as well as work on the mechanics of shooting and learning to be accurate with their shot placement.
Then when they go hunting you load up the special round to make sure it gets the job done.
They won't even notice they'll be so pumped up, just like what happens when we shoot at big game.