I've found that the Gualandi wads are a bit larger in diameter which seem to seal well in the Cheddite hulls that seem to run a little larger on ID. Using the clear hulls you can see that the wad's larger diameter and "ring" seal minimizes powder getting blown up past the wad during seating. I think this makes a more consistent load. I use them to load 3/4oz in both 12 and 16ga.