For what it's worth I have only used size 4 shot on both ducks and geese. The club next to ours has
more experience with this stuff than we do as one of them is a Hevi-Shot company guy. What we hear is that the 7 1/2 load is a better duck buster. It's hard for me to understand why. The pattern with 4's is plenty dense. I have aquired the shot for reloading again in 4's. It drops poorly in my Pozie and the reloading manual says you should weigh each load because it drops poorly in sizes larger than 6's. Well, I'll have a better knowledge of this stuff by next season. If your not using #4 but another size I would like to hear
what your experience is with this product. Thanks!