For some reason in the last week I developed an urge to buy a Mossberg Shockwave shotgun. I got one yesterday and tested it today.
With birdshot the recoil didn't seem that bad. However, after shooting my normal #1 Buck home defense load I have to say that my right hand that was holding the front grip now hurts. On the other hand the birds head rear grip produces recoil that (while not exactly mild) was not uncomfortable for my left hand. There appears to be some thought that went into the birds head grip. Next step is to order a GG&G light mount