Tom, interesting you mention the aspect of High Humidity. I would imagine that the shot may in some way squeeze moisture droplets from the air and make the effect more visual. Much in the way that if you crack a flag by waving it sharply and it condenses moisture droplets. You might be on to something there as to why it's more noticeable in certain conditions. Lagopus.....
Pretty much what I always figured.
I never saw it myself, just passing on what a seriously skilled skeet shooter and field wing shot told me. I did slow my swing and broke a lot more birds that day.
He’s no BSer, either. If he tells me he saw Santa Claus, I’m putting out milk and cookies.