I called these guys in this morning, about 35 yards. My friend was shooting a Huglu 12 bore SxS with a Hevishot duplex load, I used my Samuel Smallwood 10 bore Damascus hammergun, loaded with 1.5 oz. of Bismuth #4 over 3.5 dr. Swiss FFg in brass shells. We fired simultaneously and my bird dropped like a rock, his required two more shots and was still flopping.

[Linked Image from i.imgur.com]