No experiance with them, but I can't see how less recoil means anything but less performance. I would be more concerned with him getting turned off early if he can't hit a deer, or worse yet, loses one. I started my kids hunting with full loads in all their weapons, although they did practice wingshooting with light loads. For slugs, you can always add some weight to the gun, put on a recoil pad, ect. And don't let him shoot any off a bench! Slugs do not kick bad if you roll with them.