When talking of one load having more or less recoil than another unless both loads have been carfully weighed for total ejecta weight & accurate velocity measurements made of the speed, You actually don't Have a Clue as to Why. Reading the listed velocity & pressure from a loading manual is not a guarantee that is what you actually acheived. Weight times velocity accounts for about 98% of recoil, all other factors make up the remaining insignificant 2%.

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