At 6:30 almost to the end of this video there is a slow motion shot of the pellets with a white background.
Similar to the visible shot cloud on the skeet field..only faster wink



I once had a Parker SC SBT with .045 choke. I let friends use it and could clearly see the pattern when standing behind the shooter, all the way to the break of the target.

Not much humidity in AZ except during the Monsoon season, and I think the shot cloud is more clear without the humidity haze.