As Chris noted, he and I shot with Dave several years ago, and later had dinner with him. A VERY enjoyable evening.
I managed to trounce him fairly handily at Wobble Trap, a fact about which I'm still very proud, but given it was his first time shooting it...
What really came through that entire evening, though, was just how much about shotgunning I learned just listening to Dave's off-handed comments, things that I've been able to employ to make my shooting better.
I really wish that we had been able to do some sporting clays, as I have no doubt that he would have been able to give me pointers that would have immensely improved my game there.