@ratshooter- The OP did say "rifle or other long gun." While you are right, this is the Rifle forum, the OP did open it up to shotguns, albeit perhaps not intentionally. I will refrain from making a comment about criticizing people for reading the original post...
@OP- While I would normally reccomend a shotgun, to keep ratshooter from bad mouthing me
, I would have to suggest my Mosin m44- 5 rounds of heavy ammo, and with the bayonet out, I might stab a threat before shooting him...