Carlson's Longbeard XR choke with Winchester Longbeard XR, for me, is deadly. I shoot an Ithaca 12ga, 3" #6 shot. Dropped a nice gobbler last year at ~55 steps in an open field, he didn't twitch. The year before I took a bird under 15 steps that literally produced a jellyhead...
The Longbeard XR greatly outperforms anything else I've shot, and is vastly superior to lead. My son's 20ga Weatherby is setup with the Hevi-shot choke for the Hevi-shot Magnum blend, but this year we're trying the 20ga Longbeard XR (choke and #6 ammo), which we just couldn't get before it sold out last year...