RE: 30-30 And Shoulder Shots
I haven't shot alot with my 30-30 marlin. But I did notice while hunting with it holding the lever would cause it to open from time to time. It was a bit annoying. However, if a younger kid treats it like a single shot it probably will be fine. Meaning not worrying about the follow up shot until later. I do this with my daughter with my shotgun.
It's been a while since I've shot my 30-30 but alot of deer have fallen to that round. I cannot use a rifle here so the Shotgun gets all the woods time.