Well, I got to try it. We tacked on an evening of pest pigeons, and just used the loaner guns the owner had. Mine was a 680 series Beretta in 12 gauge, which is close enough to my 687 for goverment work.
Long and short of it, I shot 15 boxes of field loads in about 2 hours, probably hit a little over half taking shots as they came. When I picked shots for ease of hitting the percentage went way up. We were happy to not go out the next morning like we had initially planned, as the flinch monster was starting to show up.