Shotgun gauges currently in commercial production are 10, 12, 16, 20, 28, and .410 bore. Beyond those six, several historical gauges like the 4, 8, 24, and 32 still exist in collector circles but are no longer widely manufactured. The gauge system itself is unusual: the number refers to how many lead balls of that bore diameter it takes to equal one pound. A 12 gauge barrel, for example, fits a lead ball weighing 1/12 of a pound. The smaller the number, the larger the barrel.
12 Gauge: The Standard
The 12 gauge dominates the shotgun world. It accounted for 60.9% of global shotgun ammunition revenue in 2024, and it’s the only gauge regularly used by military and law enforcement. Its popularity comes down to versatility: by swapping shells, you can hunt waterfowl, deer, upland birds, or small game with the same gun. Shells come in lengths of 1-3/4″, 2-3/4″, 3″, and 3-1/2″, each carrying different payloads for different jobs. The tradeoff is recoil. A standard 12 gauge target load produces about 18 ft-lbs of recoil energy, and a typical waterfowl load jumps to nearly 33 ft-lbs.
20 Gauge: The Fastest-Growing Option
The 20 gauge is the second most popular gauge and the fastest-growing segment in the ammunition market, expanding at about 5.2% annually. It appeals to newer shooters, younger hunters, and anyone who wants less punishment from their gun. A 12 gauge load produces 40 to 60% more recoil than a comparable 20 gauge load. In concrete terms, a 20 gauge target load kicks at around 11 ft-lbs of recoil energy, and waterfowl loads sit near 19 ft-lbs.
That reduced recoil doesn’t make the 20 gauge a toy. It handles most of the same tasks as a 12 gauge, though with a smaller shot payload per shell. For upland birds, home defense, and even deer with the right slugs, a 20 gauge is a capable all-around shotgun. Ammunition is widely available at any sporting goods store.
16 Gauge: The In-Between
The 16 gauge has a long-standing reputation as the gauge that “carries like a 20 and hits like a 12.” A well-built 16 gauge gun typically weighs between 6 and 6-3/4 pounds, lighter than most 12 gauge guns while still pushing a meaningful shot charge. Its pattern efficiency is about 7% better than the 20 gauge, thanks to a more favorable ratio between the shot column’s length and bore diameter. That translates to more even pellet distribution at typical hunting distances.
The 16 gauge was once a favorite among European sportsmen, though it faded in popularity during the 20th century as 12 and 20 gauge guns took over the market. It has experienced a modest revival among upland bird hunters who appreciate its balance of power and portability. Ammunition is less common on store shelves than 12 or 20 gauge but is still produced by major manufacturers.
28 Gauge: The Upland Specialist
The 28 gauge has earned a devoted following among upland bird hunters, particularly in thick grouse and woodcock cover where every ounce of gun weight matters. A standard 28 gauge load carries 3/4 ounce of shot, which doesn’t sound like much, but it’s potent enough to kill cleanly past 30 yards. The light recoil, even in very light guns, means you can shoot all day without wearing out your shoulder.
The practical advantage is carrying comfort. In dense brush where you’re often holding the gun in one hand while pushing branches aside with the other, a trim 28 gauge feels dramatically different from a heavier 12. That same lightness helps older hunters stay in the field longer. Beyond grouse woods, the 28 gauge is increasingly showing up in turkey camps, duck blinds, and prairie bird hunts, though it performs best at moderate ranges where its smaller payload isn’t a disadvantage.
10 Gauge: Maximum Payload
The 10 gauge sits at the top of commonly available gauges. Its large bore pushes heavy payloads of shot, which made it the go-to choice for long-range waterfowl hunting before the 12 gauge 3-1/2″ magnum shell narrowed the performance gap. Today, 10 gauge guns are niche items used primarily by dedicated goose hunters who want the densest patterns at extended range. The guns are heavy, the recoil is substantial, and ammunition selection is limited compared to 12 or 20 gauge.
.410 Bore: The Exception to the Rule
The .410 is the only common shotgun that isn’t measured in gauge. Instead of using the lead-ball system, it’s named for its actual bore diameter: 0.410 inches. If it were converted to the gauge system, it would be roughly a 67-1/2 gauge. It’s the smallest shotgun bore you’ll find ammunition for at a typical store.
The .410 generates very mild recoil, which makes it a common first gun for young shooters learning to handle a shotgun. It’s also used for small game like squirrels and rabbits, and for skeet shooting in the smallest-gauge events. The limited shot payload means it demands more precision from the shooter, so despite its gentle kick, it’s actually harder to hit flying targets with a .410 than with a larger gauge.
Rare and Historical Gauges
Several gauges that were once commercially loaded have largely disappeared from the mainstream market. The 4 gauge and 8 gauge were massive guns used in the era of market hunting, when hunters killed large numbers of waterfowl for sale. Federal law eventually restricted their use, and they faded from production. You’ll occasionally see antique examples at gun shows or in collections.
The 24 gauge occupies a curious middle ground between the 20 and 28. It remains popular in parts of Italy and France, where it has a longer cultural tradition, but it’s extremely rare in the United States. Finding ammunition is the main challenge: Fiocchi is one of the few manufacturers that loads it, and components for handloading are available from specialty suppliers but require some searching. Collectors note that 24 gauge guns don’t come on the market often, partly because owners know how difficult it is to find replacements.
The 32 gauge is similarly obscure in the U.S. but has a small following among European shooters and collectors of British-made guns. Like the 24, its practical limitation is ammunition supply rather than any shortcoming in performance.
Choosing a Gauge
Your choice depends on what you plan to shoot and how much recoil you’re willing to absorb. The 12 gauge covers the widest range of uses and has the most ammunition options by a wide margin. If recoil is a concern, the 20 gauge handles nearly as many tasks with noticeably less kick. The 16 gauge splits the difference for hunters who want a lighter field gun without dropping to a smaller payload. The 28 gauge and .410 are specialist tools that reward skilled shooters in specific situations, particularly close-range bird hunting and small game.
Ammunition availability matters as much as ballistics. The 12 and 20 gauge will be on the shelf at virtually any retailer that sells ammunition. The 16 and 28 gauge require slightly more effort to find, and the .410 is widely stocked but in fewer varieties. Anything beyond those five will likely mean ordering online or handloading your own shells.