I field hunt for geese and over decoys for duck. For geese I shoot an IM and 3 1/2 Kent BBB's. Average range of 30 yards. For ducks I shoot an IC with 2 3/4 inch 2's. average shot is 20 yards. Some of my hunting partners shoot hevishot etc. It all seems to work the same. When they commit and their eyes blink. Take em.