The hardness of the shot equates to less shot deformation. The deformed shot, whether from bore scrubbing or setback forces, are less aerodynamic and make their way to the rear of the shot string. We may be talking about a difference of 1/8" to 1/4" in payload length, but a possible range of 4 feet to 12 feet length of shot string.
While it is true that this is nothing to worry about in shooting, IMO, there is nothing wrong with discussing it on a forum like this and trying to understand it more. I do not think anyone who is posting or reading posts on here is in the middle of a shooting session, but may VERY WELL BE enjoying a beer or single malt. Shooting like there is no variation in shot string length and also trying to better understand shotgun ballistics are not mutually exclusive. I'm proof of that.
All my best, Stan
