Dirty Harry's .44 Magnum: Why It's Actually a .43 Caliber

The .44 Magnum Myth

• 💡 Many believe Dirty Harry carried a .44 Magnum, but the reality is more nuanced, with some scenes possibly featuring a .41 caliber.
• 🎯 The focus today is on the .43 Magnum, a caliber that might be unfamiliar to many firearm enthusiasts.

Understanding Bullet Calibers

• 🔬 The key to the .44 Magnum's true caliber lies in its bullet diameter, which is actually around .43 inches (typically .429 to .431 thousandths of an inch).
• 📊 This measurement is why the speaker refers to it as a .43 caliber firearm.
• ⚠️ Early .44 caliber cartridges, like the .44 Henry and .44 Smith & Wesson American, used heel-type bullets where the bullet's diameter was flush with the case, similar to modern .22LR rounds.

Evolution of Cartridges

• ⚙️ The .44 Russian cartridge was developed with an inside-lubricated bullet that fit down into the case, requiring a smaller bullet diameter and consequently, a smaller barrel diameter.
• 📈 This shift led to what we commonly call .44 caliber firearms actually having a bore diameter closer to .43 inches.
• 🔑 Handloaders and those familiar with firearms have long known that .44 caliber bullets are typically .43 inches in diameter.

The .43 Caliber Reality

• 💬 The speaker emphasizes that despite the common name, the firearms are effectively .43 caliber, a fact known to handloaders.
• ✅ While it's acceptable to continue calling it a .44 Magnum, the technical reality is that it fires a .43 caliber bullet.
• 🎬 Even Clint Eastwood, as Dirty Harry, was likely unaware he was carrying what is technically a .43 caliber firearm.