Benelli M1 super 90 18" barrel 12 gauge semi auto with Brenneke 12 gauge 2 3/4" 1 3/8oz (602 grain) maximum barrier penetration hardened slugs. (1650fps/3550fpe at the muzzle).

In tests done by Brenneke, at 7yds, these rounds will defeat level IIIA body armor and still go on to penetrate in excess of 30" of ballsitics gelatin

I have several boxes of these on hand in case of Alien T-Rex invasion.

EDITED to add additional ballistic data.