It’s no surprise that innovative designs like the Iver Johnson MF20 have emerged; by merging the best features of both shotguns and ARs, this firearm offers impressive—but controllable—firepower while ...

Many other propellants, though, perform just as well firing 7/8 oz. of shot in the 20 gauge. A few include Winchester Super Field and 572 and Hodgdon Universal and Longshot. The Winchester’s ...