Browning BPS 3.5" 10 ga- that or +p's out of my 337-or the Ithica 20 ga sxs by SKS with 3" mag 20 ga-maybe not the most powerful by a long shot, but each brought tears to my eyes
Now as far as a big boomer and fun-well that would be my Ruger super redhawk in 44 mag or my 686 2.5"(which throws a FLAME like you would not believe)