I think Ky Jon is right. An 1100 is perfect for a kid. Too many things to do right with a hammer gun. It is easier to control his consciousness of safety if things are simple. Recoil is not something to ignore either.
I have also been teaching my 13 year old grandson. He also was a rifle shooter and that was a lot to overcome. Keeping the gun moving is not natural to a rifle shooter. We started him earlier with squirrel hunting with a Charles Daly (probably Turkish) youth semiauto that weighed 5 1/4 lbs and that is a lot like rifle shooting. He was a real little guy but has hit his first real growth spurt. He is around 5-3 and slim but athletic so the standard 20g. 1100 was the next step. He has learned a lot on the skeet field.
Lots of luck Mark and enjoy this new experience. Your nephew will never forget it.
