Thanks for all the infoReduced/managed recoil 12ga ammo has less recoil than standard loads, but still has plenty of power for use as a defense load......that's exactly what it's designed for. Most LE agencies use reduced recoil loads in their pump action shotguns and it's what I use in all of mine.
Reduced recoil 12ga ammo has recoil similar to a full-load 20ga, but holds much more shot (or a larger slug).
In terms of reliability, pump vs semi-auto, here's the conclusion I've come to from 20+ years of teaching defensive shotgun course; most malfunctions sill with pump actions are do to user error, while most malfunctions with semi-autos are due to ammo.