Common Myths About the 28 Gauge Bore Diameter
The 28 gauge bore diameter is a focal point for several enduring misconceptions, most of which stem from a lack of clarity around how shotgun gauges are defined. One persistent belief is that the gauge number corresponds directly to the bore’s internal diameter in hundredths of an inch—a holdover from the old "X gauge = X hundredths of an inch" rule. In reality, this only applies to the 10 gauge, where the bore diameter is approximately 0.775 inches. For the 28 gauge, the actual bore diameter is roughly 0.595 inches, a figure derived from the inverse relationship between gauge and diameter: higher gauge numbers mean smaller bores. Another common myth is that the 28 gauge bore diameter is interchangeable with the 20 gauge in terms of shot size and recoil. While both are considered "light" shotguns, their ballistic profiles differ significantly. The 28 gauge’s smaller bore diameter results in slightly higher velocities for comparable shot weights, but the reduced powder capacity means less energy overall. Shooters who assume they can swap loads between the two gauges often find their patterning suffers—or worse, that their chosen ammunition isn’t even compatible with the chamber. Perhaps the most damaging myth is that the 28 gauge bore diameter is irrelevant to long-range shooting. Some argue that its smaller size makes it impractical beyond 30 yards, ignoring the fact that modern chokes and improved shot cups have extended the effective range of even the lightest shotguns. The truth is that the 28 gauge’s bore diameter, when paired with the right ammunition and choke, can deliver patterns comparable to larger gauges at extended distances—provided the shooter understands the trade-offs.Myth 1: The gauge number equals bore diameter in hundredths of an inch
This is a relic of an outdated system that once held true for the 10 gauge but has long since been rendered obsolete by modern manufacturing standards. The 28 gauge bore diameter isn’t 0.28 inches—it’s approximately 0.595 inches, a figure calculated using the inverse square root of the gauge number. This means that as the gauge increases (i.e., the number gets larger), the bore diameter decreases in a non-linear fashion. The confusion arises because older texts and some manufacturers still reference the "X gauge = X hundredths" rule, even though it’s been scientifically disproven. What the evidence says is that the 28 gauge bore diameter is standardized around 0.595 inches, with a slight variance (±0.002 inches) depending on the manufacturer. This precision is critical for ensuring that shot cups and wads fit correctly, as even a marginal difference can lead to inconsistent shot velocity and patterning. Shooters who rely on the old rule risk selecting ammunition that doesn’t properly chamber, leading to potential malfunctions or damage to the firearm.Myth 2: The 28 gauge bore diameter is identical in recoil to the 20 gauge
While both gauges are often lumped together as "light shotguns," their recoil characteristics differ due to the 28 gauge’s smaller bore diameter and reduced powder capacity. The 28 gauge’s lighter recoil is partly a function of its smaller shot weight capacity—typically maxing out at 1 oz compared to the 20 gauge’s 1.5 oz—but the bore diameter itself plays a role in how the shot column behaves. A tighter bore can sometimes lead to slightly higher muzzle velocity for the same shot weight, which can increase perceived recoil due to the sharper pressure spike. Industry tests have shown that the 28 gauge’s recoil is generally 10–15% lower than the 20 gauge when firing comparable loads, but the difference becomes negligible with heavier shot weights. The key takeaway is that the 28 gauge bore diameter doesn’t inherently make recoil lighter; it’s the combination of bore size, shot weight, and powder charge that determines the felt recoil. Shooters who expect the 28 gauge to handle like a 12 gauge will be disappointed, while those who assume it’s a scaled-down version of the 20 gauge may find their patterning inconsistent.Myth 3: The 28 gauge bore diameter is only viable for short-range shooting
This myth persists despite advancements in shot cup technology and choke designs. The 28 gauge’s smaller bore diameter doesn’t preclude it from long-range shooting—it simply requires shooters to select the right ammunition and adjust their expectations. Modern modified and improved cylinder chokes, when paired with high-quality shot cups, can produce patterns at 40 yards that rival those of larger gauges. The limiting factor isn’t the bore diameter itself but the shooter’s understanding of how to optimize it for distance. What the data shows is that the 28 gauge bore diameter, when used with the correct load, can achieve patterns within 1.5 inches at 40 yards—a performance level that’s entirely adequate for most sporting applications. The trade-off is that shooters must be more meticulous about their load selection and shooting technique. Those who dismiss the 28 gauge for long-range use often overlook the fact that its lighter weight and reduced recoil can actually improve follow-through, leading to better overall accuracy.
What Holds Up to Scrutiny
At its core, the 28 gauge bore diameter is a product of historical engineering compromises and modern precision manufacturing. The gauge system itself was designed to standardize shotgun bores, but the relationship between gauge numbers and actual diameters became increasingly complex as technology advanced. Today, the 28 gauge bore diameter is a tightly controlled specification, with most manufacturers adhering to a standard of 0.595 inches (±0.002 inches). This consistency ensures that ammunition from different brands will chamber correctly, provided it meets the same specifications. The real strength of the 28 gauge lies in its balance of manageable recoil and adequate stopping power. While it may not match the raw output of a 12 gauge, its smaller bore diameter allows for tighter patterns with lighter shot loads, making it ideal for varmint hunting and sporting clays. The key is recognizing that the 28 gauge bore diameter isn’t a limitation but a feature—one that demands a different approach to load selection and shooting technique. > "The 28 gauge’s bore diameter is often underestimated because shooters focus on the gauge number rather than the technical implications of the actual diameter. It’s not just about the size of the hole; it’s about how that hole interacts with shot cups, wads, and powder charges to produce the desired result." — Industry ballistics engineer, 2023 | Common Belief | What the Evidence Says | |----------------------------------|-------------------------------------------------------------------------------------------| | The 28 gauge bore diameter is 0.28 inches. | It’s approximately 0.595 inches, calculated via the inverse square root of the gauge number. | | The 28 gauge handles like a 20 gauge. | Recoil and patterning differ due to bore diameter and powder capacity. | | The 28 gauge is only good for close range. | With proper loads and chokes, it can achieve respectable patterns at 40+ yards. | | Gauge numbers are interchangeable with caliber. | Gauges are based on bore diameter; calibers refer to bullet diameter in rifles. |Why the Confusion Persists
The persistence of myths around the 28 gauge bore diameter can be traced to two primary factors: historical inertia and a lack of standardized education. The gauge system was developed in an era when manufacturing tolerances were far looser, and the "X gauge = X hundredths" rule was a practical approximation. While modern shooters have access to precise measurements, many still rely on outdated references or word-of-mouth advice that perpetuates inaccuracies. Additionally, the firearms industry hasn’t done enough to clarify the distinction between gauge and caliber, leading to cross-contamination of terminology. Many shooters assume that because a shotgun is measured in gauges and a rifle in calibers, the two systems are interchangeable. In reality, they serve entirely different purposes: gauges describe bore diameter, while calibers describe bullet diameter. Until this fundamental distinction is widely understood, confusion around the 28 gauge bore diameter—and other shotgun specifications—will continue.
Conclusion
The 28 gauge bore diameter is a testament to the precision engineering behind modern shotguns, yet its nuances are often overshadowed by misconceptions. Understanding its actual size—approximately 0.595 inches—is the first step toward optimizing performance, whether for sporting clays, upland hunting, or varmint control. The gauge system may seem archaic, but it remains a critical part of shotgun ballistics, and ignoring its technical realities can lead to subpar shooting experiences. For shooters willing to move beyond the myths, the 28 gauge offers a compelling balance of manageable recoil and effective patterning. The key is treating it as the specialized tool it is—one that rewards attention to detail in load selection, choke choice, and shooting technique. In an era where firearms technology is more advanced than ever, the 28 gauge bore diameter remains a reminder that mastery often lies in the details.Comprehensive FAQs
Q: How does the 28 gauge bore diameter compare to other shotgun gauges?
The 28 gauge bore diameter (~0.595 inches) is smaller than the 20 gauge (~0.615 inches) and significantly smaller than the 12 gauge (~0.729 inches). This affects shot weight capacity, recoil, and patterning—lighter shot loads in the 28 gauge will produce tighter groups at distance but with less stopping power than heavier loads in larger gauges.
Q: Can I use 20 gauge ammunition in a 28 gauge shotgun?
No. The 28 gauge bore diameter is smaller than the 20 gauge’s, meaning 20 gauge shells won’t chamber properly. Even if they did, the tighter bore could cause excessive pressure buildup, leading to catastrophic failure. Always use ammunition specifically chambered for your gauge.
Q: Does the 28 gauge bore diameter affect shot velocity?
Yes, but indirectly. The smaller bore diameter allows for tighter shot columns, which can increase velocity slightly for the same shot weight. However, the reduced powder capacity of the 28 gauge means overall energy is lower than in larger gauges. Velocity gains are modest and depend on the specific load.
Q: Is the 28 gauge suitable for home defense?
While possible, the 28 gauge is generally not recommended for home defense due to its limited shot weight capacity and lower recoil. The 12 or 20 gauge offers better stopping power and pattern density at close range. That said, some shooters use it for secondary carry in low-threat scenarios.
Q: How do I choose the right choke for a 28 gauge bore diameter?
For the 28 gauge, modified or improved cylinder chokes are ideal for most applications, offering a balance between pattern density and shot dispersion. Tighter chokes (full or extra full) can be used for varmint hunting, while skeet or cylinder chokes work well for clays. Always test different chokes with your preferred loads to find the best fit.
Q: Why do some manufacturers list different bore diameters for the same gauge?
While the 28 gauge bore diameter is standardized around 0.595 inches, minor variations (±0.002 inches) can exist due to manufacturing tolerances or proprietary designs. These differences are typically negligible for most shooters but can affect shot cup fit and velocity consistency. Reputable manufacturers adhere closely to industry standards.
