IMHO, In any critical scenario you only have one shot outta that short long-gun anyway.........but consider this,
Why is it that on all the wildlife programs about dangerous bear country the 'bear-gun' they pull out is (appears to be) a 12ga. repeater? Pumps are the most often seen I think. An old style 'police' 12ga. pump, cheap, effective, whats wrong with that? Well, I know.......its not the 338..........
If you are just enamored of the sgl. shot platform for your stated purpose for a thumper load, get a 20 or 12ga. (smooth or rifled) slug shooter c/w sights.