I have a Rem 870 with rifled barrel and cantelever scopemount in 12ga.I never shot a 20ga. slug, but I heardthere are not to bad as far as recoil.I like the Federal Power shock sabots that cost $8.00 per box, but youmust find the brandthat shots the bestout of your rifle. If recoil is still a problemwith standard 20ga. sabots, you couldtry theRemington low recoil sabots.