I don't notice a difference when hunting wild pheasants. I often use my Browning auto 20 in larger groups with high pressure loads and then switch to my LC 20 with low pressure loads from polywad when it is just me and my father-in-law. I have never had problems shooting the farther shots.
Will you notice a loss of performance on shooting birds with low pressure loads? I was thinking of ordering some for ruffers and sharptail grouse. I am not concerned about ruffed grouse, but was wondering because of the longer distances I normally shoot sharptails at.