It boils down to the world may suck, but at least it sucks consistently. Higher BC does cut your wind reading error. Everybody that sucks @ wind reading raise your hand. My hand goes up. Range estimation can also be an issue on UKD targets.
Or you could just use a dang shotgun and don't worry about it.
Shotgun thing:
There was a slow motion film I saw of a shotgun shooting balloons with bird shot. Shot spread vertically and horizontally. It also spreads front to back. I always pictured it as a wall of shot. I now picture it as a more of ball of shot. Just never thought about it before seeing that.
Speaking of Shotguns - 20 pages in and no word from the OP.
It's actually a 'string' of shot, from what I've seen. A moving target may move through your string of shot. If you're swinging through, when you shoot, that string may not be cylindrical. More of a parallelogram, but rounded.
I'm learning much more about shotguns, and shotgun ballistics, now that I'm reloading for them.
One day I hope to not embarrass myself at shooting skeet. As it stands now, I leave a lot of breeders out there.
I've been practicing with a .410, hoping to aim small, miss small.
Right now I'm doing a horrible job of vinyl wrapping a Win Mod 12, 20ga. I'm a butcher, I tell ya.