I received the Indian Creek choke this afternoon and immediately tested it, and my suspicions were correct - the Indian Creek with .555 constriction is too tight for the TSS #9 (at least for my son's Weatherby SA-08). The Longbeard XR choke remained the top choice and gave the densest and most consistent pattern.

The Indian Creek had the best pattern (by far) for #5 shot, for both Winchester Double X and Longbeard XR, and it increased shot load almost 50% on an 8x11 target. I also tried the TSS out of the Hevi-shot choke (.560), but the pattern out of the XR choke (.558) was by far the best for the TSS #9.

Shoot ole Tommy Three Toes in the face ya'll!