Taking his 20 to 1/2 ounce of shot would be no different than giving him a 410which is a bad idea. Let him grow a little......
If you want to do something constructive teach him eye-hand coordination by shooting the BB gun at airiel targets like ping pong balls. Both eyes open, toss the PP ball while your standing next to him so its easy and then increase the difficulty once he has the easy under his belt.
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