Don't you have a sx3? I have tried the SSX in my Invector plus barrel. With the Long Beards it didn't do as well as the .665 IC. With #5's it averaged around 165 and the IC has been between 180 and 200 with a best of 203 at 40. Now with regular lead loads like the Turkey Thugs and Winchester the SSX was one of the best I had tried in my gun. Had 2 different lead 5 loads last year that would go around 130 and the Thug 6 and Win. XX 3-2-6 would stay in the mid 140's. This is all with 3", as my guns not cambered for 3.5".