Decoding Shotgun Gauges: A Guide to 12ga Bore Diameter, 20 vs 28 Gauge, and Beyond
As an outdoor writer and hunter with over a decade of experience, I’ve fielded countless questions about shotgun gauges. It’s a surprisingly complex topic! Many newcomers – and even seasoned shooters – get tripped up by the terminology. Understanding the differences between a 12ga bore diameter and a 20 gauge vs 28 gauge shotgun is crucial for selecting the right firearm for your needs. This article will demystify shotgun gauges, covering everything from shell weight and velocity to practical applications like pheasant hunting and sporting clays. We’ll also address why some gauges, like the 28 gauge, can be surprisingly expensive.
What Does "Gauge" Actually Mean?
The term "gauge" is a bit archaic, stemming from the practice of determining the bore diameter by the number of lead balls, each with the same diameter as the bore, required to weigh one pound. So, a 12 gauge shotgun means it takes 12 lead balls to equal a pound. A 20 gauge takes 20, and a 28 gauge takes 28. Therefore, a lower gauge number indicates a larger bore diameter. This is often counterintuitive for beginners!
Here's a quick breakdown of common shotgun gauges and their approximate bore diameters:
- 12 Gauge: .729 inches
- 20 Gauge: .615 inches
- 28 Gauge: .550 inches
- .410 Bore: .410 inches (Note: .410 is a bore measurement, not a gauge)
While the 12 gauge is the most popular, the 20ga vs 28ga debate often comes down to personal preference and intended use. We’ll dive deeper into that shortly.
12 Gauge vs. 20 Gauge: The Workhorses
The 12 gauge reigns supreme for a reason. Its larger bore allows for heavier payloads of shot, making it incredibly versatile. You’ll find 12 gauge shotguns used for everything from waterfowl and upland game hunting to home defense and competitive shooting. The 12 gauge fps (feet per second) of shot can be quite high, delivering significant energy downrange. Common 12 gauge 6 shot pheasant loads are readily available and effective.
However, that power comes with recoil. The 12 gauge bore diameter and heavier loads translate to a more substantial kick. This is where the 20 gauge shines. It offers a significant reduction in recoil, making it a great choice for smaller-framed shooters, beginners, or those who shoot high volumes. While it doesn’t deliver the same raw power as a 12 gauge, modern 20 gauge 3 inch pheasant loads can be remarkably effective on upland birds and even light waterfowl.
Choosing Between 12 and 20 Gauge for Specific Applications
- Waterfowl Hunting: 12 gauge is generally preferred for larger ducks and geese, especially at longer ranges.
- Upland Game (Pheasant, Quail, Grouse): Both gauges are effective. The 20 gauge is often favored for closer shooting and reduced recoil.
- Sporting Clays: Both are popular. Many competitive shooters prefer the 20 gauge for its quicker handling and lower recoil, allowing for faster follow-up shots. The 12 vs 20 gauge for sporting clays often comes down to shooter preference.
- Home Defense: 12 gauge is a common choice, but a 20 gauge with appropriate buckshot can be equally effective.
The Elegant 28 Gauge: A Niche Favorite
The 28 gauge is often described as the “gentleman’s gauge.” It’s lighter recoiling than both the 12 and 20 gauge, making it a joy to shoot. However, it also presents some challenges. The smaller bore means lighter payloads, requiring more precise shooting. And, as many shooters wonder, why are 28 gauge shells so expensive? Lower production volumes and a dedicated, but smaller, following drive up the cost.
Despite these drawbacks, the 28 gauge has a devoted following, particularly among upland bird hunters who appreciate its challenge and elegance. While 28 gauge buckshot or slugs are available, it’s primarily used for bird hunting.
20 Gauge vs. 28 Gauge: A Closer Look
The 20 vs 28 gauge comparison is often about finding the sweet spot between recoil and performance. The 28 gauge offers even less recoil than the 20, but also delivers less energy. Here's a quick table summarizing the key differences:
| Feature | 20 Gauge | 28 Gauge |
|---|---|---|
| Bore Diameter | .615 inches | .550 inches |
| Typical Shot Weight | 7/8 oz - 1 1/8 oz | 3/4 oz - 7/8 oz |
| Recoil | Moderate | Light |
| Versatility | High | Moderate (primarily upland birds) |
| Shell Cost | Moderate | High |
Beyond the Common Gauges: .410 Bore and the Rare 6 Gauge
While 12, 20, and 28 gauge are the most common, it’s worth briefly mentioning the .410 bore and the incredibly rare 6 gauge. The .410 bore is a small-bore shotgun often used for introducing new shooters to the sport due to its minimal recoil. However, its limited payload makes it less effective at longer ranges.
The 6 gauge shotgun is a relic of the past. Historically used for market hunting, it’s incredibly powerful and produces massive recoil. Finding a 6 gauge shell today is extremely difficult and expensive. It’s largely a collector’s item.
Understanding Shotgun Shell Weight and Load Choices
Once you’ve chosen a gauge, you need to consider the shell weight and load. Shot weight is measured in ounces or dram equivalent. Higher shot weights generally deliver more energy, but also increase recoil. The size of the shot (e.g., #6, #8, BB) determines the pattern density and effective range. #6 shot 12 gauge is a popular all-around choice for upland birds.
You’ll also encounter different shell lengths: 2 3/4 inch, 3 inch, and sometimes 3 1/2 inch. Longer shells generally allow for larger payloads. The 2 3/4 vs 3 inch shells debate often centers around recoil and capacity. 3-inch shells offer more powder and shot, but also generate more recoil.
How Far Can a 20 Gauge Shoot?
The effective range of a 20 gauge shotgun depends heavily on the load and the shooter’s skill. With appropriate shot size and choke, a 20 gauge can effectively engage targets out to 40-50 yards for upland birds. However, for waterfowl, longer ranges are generally not recommended due to the lighter payloads.
Safety First: Responsible Shotgun Ownership
Regardless of the gauge you choose, always prioritize safety. Follow the four rules of gun safety: Treat every gun as if it is loaded, keep your finger off the trigger until ready to shoot, never point a gun at something you don't intend to shoot, and be sure of your target and what is beyond it. (National Shooting Sports Foundation). Proper training and practice are essential for safe and effective shotgun shooting. Consider taking a hunter education course offered by your state’s wildlife agency (National Park Service offers resources as well). And always practice Leave No Trace principles when hunting or shooting outdoors (Leave No Trace Center for Outdoor Ethics).
Choosing the right shotgun gauge is a personal decision. Consider your intended use, physical build, and shooting experience. Don’t hesitate to try different gauges and loads at a shooting range before making a purchase. And remember, responsible gun ownership is paramount. For more information on shotgun selection and shooting techniques, consult resources from reputable organizations like REI Expert Advice (REI) and the USDA Forest Service (USDA Forest Service).