Triple Se7en your correct in that I have never hunted or shot the clean shot in wet conditions. When I first got the stuff a store went out of business and I bought two pounds of it for $10.00. I did shoot it a lot at the house here, target shooting. For some reason I never did want to try it hunting. I guess after reading that all you need do is hunt or target shoot in the rain or snow and the moisture problems happen, I am glad I never did. I still have almost a full bottle of the stuff left. I shot it earlier this year when this topic came up to see what age does to the powder. If did fine. Maybe the next misty/light rain day happens and I will have to test your theory..
Also I agree in the FFg size. That is what I have and it is about the size of gravel at times....