1 3/8 oz. # 4 Kent 3 " @ 1300fps drops Snow Geese and Ducks dead on impact very concentrated center core up to 35 yds. . I used a Muller Waterfowl Decoy choke it has ,10 constriction proved itself on the pattern board and in the field , hits on Snow Geese looked like a feather pillow had been opened open . He makes another one for pass shooting that has proved very effective using 1 3/8 # 1 Kent 3 " at 1300 fps .