Tom some times those old assumptions never die. I have taken information in print from shotshell and powder mfg's to the local gun club and tried to convince them of this more than once. I really don't think I ever converted a single person from their thinking that pressure translates to recoil. I have tried so many explanations it's ridiculous and finally realized that when you show it to them in print from scientifically conducted experiments and they still won't buy it that it's time to give it up.
Welcome aboard !