Maybe so, but I don't believe for a minute that the shotgun he was using in Iowa was his. For 175,000 smackers, they will fit the stock to you, and the stock of that shotgun was plainly too short for Kerry. Not just a little bit, either - looked like 3-4 inches worth. My husband is 6'6", and when he started using my grandfather's Browning semi-auto we had the gunsmith let 3 1/2 inches of wood into the heel of the stock and raise the comb so it would fit.
Kerry in his ordinary incarnation probably wouldn't touch a firearm of any kind if you paid him - one of his constituents back in hoplophobic Massachusetts might see him.
There was a picture of sKerry hunting last winter at his wife's farm in Pennsylvania, I'm sure they have shotguns there which probably belonged to John Heinz. The Iowa pictures are show a side by side, probably a Beretta.