dunno about the 3inch groups with the superglides but the below picture shows their groups at 100 yards out of the pro hunter with 115grains of BH209
You can actaully put a nickel over the actaul holes(4shots). Hole near the center was just a 50 yard test shot Ive always had excellent grouping with the superglides. Now orginial tight fitting shockwaves grouped 2-3inches but nothing major difference wise.