First Look: Mossberg Reserve Series O/U Shotguns If you asked the hard-core upland hunters which is their favorite type of shotgun to carry in the woods, I’d go out on a limb and say the majority will answer an over/under in either 20 or 28-gauge. Now some may prefer 410 bore, or a 12-gauge, while others are more comfortable with a double barrel side-by-side, but that’s a whole other can of worms for another article – anyway I digress. The main reason over/under shotguns are so popular in the upland hunting community is the ability to customize their shot type and spread to pair with di...