ive shot 20 and 12 ga. slug guns. i shoot a nef/h-r single shot 12 ga. rifled barrel. w/scope...that gun is a cannon but is very accurate when shooting hornady sst sabots. the 20 will be less of a kick...there alot of good sabot slugs out..(thats what i would use) hornady sst, lightfields, brenneke, and remingtons copper solids.