William with SumToy built me a choke, .667, a few years back and I'm VERY pleased with it. The choke shoots Hevi 5's & 6's very well. The choke also likes lead 5's. For me, the patterns with all the named shot are very even and dense. The 10" numbers are good, but I'm most impressed with how even and the dense both the 10" & 20" #'s are.