You are correct that the work done on the shot by accelerating one ounce of shot to 1200 fps in the 28 gauge is the same as accelerating one ounce of shot to 1200 fps in the 12 gauge.
(work is calculated by multiplying force times distance).
But again, in reference to the stress on the shot in the bottom layer of the one-ounce shot column, everything else being equal, the 12 gauge shot will be less stressed than the 28 gauge shot.
Three physically identical acrobats standing on the gym floor have the same weight on their two feet. But stack them up, feet on shoulders, three high and the one on the bottom has three times as much stress on his feet as the one on top. But the mass remained the same in both cases.
Last edited by AmarilloMike; 04/14/16 08:58 PM.
