I've read this observation by someone shooting longer than "square" loads a number of times, and it still makes sense to me. Wish I could remember and credit the source. Something to the effect that all longer loads are square with another layer of pellets riding along on top (or bottom or middle or whatever). Point being -- other than recoil discomfort in a light gun -- the additional layer of shot, despite supposed increase in "flyers", adds to pattern density and number of hits on target.
Even in the days before modern shot cups, does anyone think the % of pellets deformed by bore friction was less for the "square" part of the shot column than for the additional shot layer? As for the effect of increased pressure, I don't know anything beyond what Miller explains in his last post. And my pattern results tell me not to worry about it.
Jay
Last edited by Gunflint Charlie; 05/28/14 01:49 PM.