Well all I was really saying was that for a given amount of shot the shorter & fatter the column the shot will be much more prone to exit the barrel "ROUND" rather than "Squashed". Still don't see what's so hard to understand abut that.
Best Shotgun advice I ever read was to decide how much shot you wanted to throw, how heavy a gun you were willing to carry & how much recoil you could tolerate.
Once you reached a reasonable compromise on those three point, select a gun with the biggest hole down the barrel which met those criteria.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra