i shoot 100 gr 2F, 1 3/8 of 6's. load goes like this: powder, 2 fiber wads, then a Winchester AA wad with the cushion cut off, then the shot, then another fiber wad. I'm shooting a TC Black Mtn. Magnum with an Undertaker choke. I have to remove the choke to load the gun, but it's worth it for the pattern it throws. I would like to go heavier but I don't know how heavy of a shot charge I can safely shoot in this gun, and couldnt get a definite answer from TC on it. So i stick with 1 3/8. That load has been good for 5 spring gobblers so far.