Have you considered the Brenneke Black Magic Magnums 3" 12ga out of your smooth bore? They shoot pretty well out of my BPS non-rifled barrel.. Or maybe get a rifled choke?
The Black Magics are advertised for smooth or rifled barrels.
I carry them when in griz country. So would be great for bison, I'd think.
Last edited by Wyogal; 01/14/17.