I have a Leupold Rifleman 2-7x33 Shotgun scope on a Savage 24 in 223 over 20 gauge that has held up fine, but no 20 gauge load that I know of is going to come close to the recoil generated by a 3.5" 12 gauge load.
My other Leupold Rifleman 2-7x33 Shotgun scope, also with a "turkey-plex" reticle, is installed on a DPMS Sportical and has held up well through a couple thousand rounds down the tube.
Jeff
