Gauge is the bore size of a shotgun. Oddly enough, the smaller the number, the bigger the bore.
Common gauges
- 12 gauge: the most popular shotgun gauge, with the widest choice of shells for hunting, clays and defense.
- 20 gauge: lighter guns and less recoil, still capable for birds, deer with slugs and clays.
- 16 gauge: a classic upland gauge that sits between the 12 and 20.
- 28 gauge: a light, sweet-shooting gun for quail and skeet.
- .410 bore: the smallest common shotgun, good for small game and pests, and favored by some for snakes around the property.

Shell length
Common lengths are 2 3/4, 3 and 3 1/2 inches. The barrel stamp tells you the longest shell the gun will safely chamber.
Shell types
- Birdshot: many small pellets for birds, clays and small game.
- Buckshot: fewer, larger pellets for deer where legal and for defense.
- Slugs: a single projectile for deer and larger game.
- Specialty: steel and other non-toxic shot for waterfowl, plus less-lethal loads.


Shells and adapters on video
Aguila 12 gauge 1-inch mini-shells
Shooting 9mm from a 12 gauge with chamber adapters
Shooting .22 LR from a 12 gauge shotgun
Shopping for shells? See Shotgun Ammo on Ammo Buyers Guide.com.
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