About 150 yards. He's very safety conscious. I started training him 7 years ago and reinforce it frequently. He never takes the power of a weapon for granted. He treats slingshots, blowguns and pellet/BB guns with the same respect. He understands the physics involved and applies them to each shot. This is his first time shooting this particular rifle. I had rough zeroed it only moments prior to this series of shots. What amazes me the most is the fact that he can estimate distance and drop by looking through the scope. I still haven't figured out how he does this. I have to look at a target in context with its surroundings to make a distance estimate, then I have to look at the drop chart and holdover using that as a guide. I think he has a picture of the bullet's trajectory in his head somehow. He's an amazing little boy.
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"The trouble ain't that there is too many fools, but that the lightning ain't distributed right."
Mark Twain