I want an AR15. The one time I shot a bunch of handguns, they scared me and I wondered about long guns. My husband’s shotgun would knock me over, so:
http://www.youtube.com/watch?v=jafkVM-jnbE
When I was 10 years old, my father, as a shooter of local renown, was invited to a demonstration for the local police of the then new Stoner rifle, (Now, the original M-16). I was allowed to go along. The salesman showed that the recoil was so light that he could shoot it with the butt on his chin. They had a cinder block wall set up and to show how powerful it was, and yet had light recoil, the salesman let me run 5 rounds full auto through it.
The dust flew. The Police Chief was not impressed, because blowing a perp to shreds at high noon on Main Street was not good PR. Police, in those days, were all WW2 vets.
You might try a smaller shotgun. A 410, perhaps.