A lot of shooters grow up hearing the same lines about calibers repeated over and over. Some of them sound convincing, but when you look at the numbers or real-world use, they don’t hold up. The problem is these myths keep getting passed around on the range, and new shooters often take them as fact. Breaking them down helps you make better choices with the rifles and pistols you actually run.
The .22 LR isn’t lethal
Plenty of people claim the .22 LR can’t kill cleanly, but history and real-world data prove otherwise. While it’s not an ideal defensive round, it’s taken down everything from varmints to deer-sized game when shot placement was perfect.
The myth comes from its small size and low energy, but that doesn’t mean it’s harmless. Treating it as a toy is dangerous. You need to respect what it can do, even if it’s not a preferred hunting or defensive caliber.
The .45 ACP always stops with one shot
You’ve probably heard someone say the .45 ACP drops attackers instantly with a single hit. While it’s a proven round, reality shows that shot placement matters far more than caliber. Even big bullets don’t guarantee a one-shot stop.
Modern ballistics testing shows 9mm and .40 S&W perform at similar levels with today’s hollow points. Believing the .45 makes you invincible leads to bad assumptions in defensive situations. Reliability and accuracy matter more than bullet diameter.
The 9mm is too weak for defense
For decades, the 9mm had a reputation as an underpowered round. That myth stuck around from the days of older FMJ loads that didn’t expand well. Today’s 9mm defensive ammunition is among the most effective options available.
The FBI and countless police agencies have switched back to 9mm because of its balance of capacity, controllability, and terminal performance. Calling it “too weak” ignores decades of advancements in bullet design that changed the game.
The .30-06 can take anything on earth
The .30-06 is legendary, but calling it suitable for every animal on earth isn’t accurate. While it can handle most North American game, it’s not the best choice for dangerous animals like brown bears. Heavier calibers are safer in those situations.
The myth comes from the cartridge’s long history of versatility. While it’s powerful, there are limits to what it can do. Believing otherwise can put you in dangerous situations with game that demand larger rounds.
The .223/5.56 is useless for hunting
Plenty of hunters dismiss the .223 as ineffective, but with the right loads, it’s proven on varmints, predators, and even deer in states where it’s legal. Modern bonded and copper bullets make it far more capable than many believe.
The myth comes from early military ball ammo that wasn’t designed for hunting. With modern bullet technology, the .223 is no longer limited to paper targets or varmints alone. Writing it off ignores its real-world versatility.
Magnum calibers always shoot farther
It’s common to hear that you need a magnum to make long shots. While magnums carry more energy, accuracy at distance has more to do with ballistic coefficient, consistency, and the shooter’s ability than sheer horsepower.
Rounds like the 6.5 Creedmoor or .308 can be extremely effective past 800 yards in the right hands. Magnum cartridges have their place, but believing they’re the only way to shoot long distances oversimplifies the reality.
Big bullets knock animals down instantly
Movies and range talk often push the idea that larger bullets physically knock game off their feet. In reality, hydrostatic shock and bullet placement are what determine how fast an animal drops. Bigger doesn’t automatically mean faster incapacitation.
Animals can run after being hit with large calibers if vital organs aren’t disrupted. Believing in “knockdown power” misleads hunters and can cause poor caliber choices. Physics doesn’t support the idea the way many think it does.
The .308 is outdated
Some shooters claim the .308 Winchester has been surpassed by modern calibers and doesn’t have a place anymore. While it’s true newer rounds like the 6.5 Creedmoor have advantages, the .308 remains one of the most practical and widely supported cartridges available.
Its balance of accuracy, recoil, and ammunition availability keeps it relevant. Calling it outdated ignores how effective it still is for hunting, defense, and military applications. It may not be trendy, but it still performs.
The .357 Magnum is too much for defense
Another myth is that the .357 Magnum is “too powerful” for personal defense. While it does pack a punch, it’s also proven to be one of the most effective defensive revolver calibers ever produced. With modern loads, it’s manageable and highly effective.
The reputation for excessive recoil and overpenetration keeps some people away. In reality, many defensive loads balance expansion and control, making it one of the most versatile revolver rounds you can carry.
Military calibers are always the best choice
Many shooters assume that if a caliber is used by the military, it must be the best option for all uses. While military adoption does prove effectiveness, it’s often based on logistics, politics, or compromise rather than absolute performance.
That means military rounds like 5.56 or 9mm aren’t necessarily the best for every civilian application. They’re effective, but believing they’re automatically superior ignores context and the wide range of shooting needs outside combat.
*This article was developed with AI-powered tools and has been carefully reviewed by our editors.
