These loads exist for non gun people in LE agencies who occasionally have to fire shotguns. They are normally running pump guns with stocks which are too long and most are not taught "push-pull."
I prefer full power slugs for duty but I can tell the difference between full power and reduced recoil slugs in an 870. The OP is running a a heavier gun which is also a gas operated semi auto - both factors in mitigating recoil.