Is A 45 Caliber Bigger Than 22Lr is a common question among shooters seeking clarity about what makes caliber size meaningful. In short, the answer is yes in terms of bullet diameter, but that doesn't tell the whole story about how these rounds behave in real-world use. This article breaks down the differences, helps you understand why caliber matters, and compares practical implications for practice, defense, and sport shooting.
Is A 45 Caliber Bigger Than 22Lr? A Clear Comparison of Caliber Size
What “Caliber” Actually Means
Caliber describes the bore diameter and, by extension, the diameter of the bullet that fits inside. For the common .45 ACP, bullets run roughly .451–.452 inches in diameter, while .22 LR bullets are about .223 inches wide. That means the .45 caliber is physically larger across the board, which influences recoil, handling, and what the gun itself is designed to do.
Practical Implications of a Larger Caliber
A larger bullet diameter often comes with higher sectional density and potential for greater tissue disruption. However, muzzle energy and performance depend on factors beyond diameter, including bullet weight, powder charge, velocity, and firearm design. In practical terms, the .45 caliber’s larger bullet can contribute to more recoil and a bigger recoil impulse compared to the .22 LR, affecting follow-up shots for some shooters.
How They Are Used
Beginner training frequently favors the .22 LR due to low recoil and affordable practice. The .45 ACP remains popular for self-defense and service pistols where larger stopping power is valued by some users. The choice often comes down to shootability, goal, and the platform you intend to use.
Key Points
- Bullet diameter: .45 ACP (~.451–.452 in) is wider than .22 LR (~.223 in).
- Recoil is generally greater with larger calibers, which can affect accuracy for new shooters.
- Terminal performance depends on bullet design, not just caliber, influencing wound channels and effectiveness.
- Training and practice habits: .22 LR is economical for learning basics, while .45 ACP targets specific self-defense scenarios.
- Platform availability and ammunition costs shape real-world choice more than diameter alone.
Bottom Line
Is A 45 Caliber Bigger Than 22Lr? In terms of bullet diameter, yes; in practical use, the best choice depends on your goals, recoil tolerance, training plan, and the specific firearm you own or plan to buy.
Is a .45 caliber always bigger than a .22 LR in diameter?
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Yes, the typical bullet diameter for .45 ACP is around .451–.452 inches, while .22 LR bullets measure about .223 inches. Other dimensions and performance depend on cartridge design and loading.
Does a bigger caliber always mean more recoil?
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Generally, larger calibers produce more recoil, but recoil also depends on firearm action, weight, grip, and load. A well-fit pistol can mitigate some of that impulse with good technique.
Which is better for beginners: .22 LR or .45 ACP?
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For beginners, .22 LR is often easier to shoot with low recoil and lower cost, supporting foundational skills. .45 ACP may be considered later for self-defense training or specific interests, once basics are solid.
Are caliber differences the main factor in stopping power?
+No. Stopping power is influenced by bullet design, penetration, expansion, shot placement, and other factors. Caliber is part of the equation but not the sole determinant.
How is caliber measured and labeled?
+Caliber is the diameter of the bullet or bore, commonly expressed in inches (e.g., .452” for a .45 caliber) or millimeters in other traditions. The label reflects standard ammunition dimensions used by manufacturers.
