Five Best Calibers Recommended for Truck Guns

A good truck gun needs to be reliable, versatile, and ready for whatever comes up — whether it’s self-defense on the road, dealing with dangerous animals, or putting meat in the cooler. Here are the five calibers most often recommended by experienced hunters, law enforcement, and backcountry travelers.

9mm Luger

The 9mm is one of the most popular choices for truck guns for good reason. It offers high magazine capacity, low recoil, and excellent reliability in both pistols and PCCs (pistol caliber carbines). Ammo is cheap and widely available, making it easy to practice and keep stocked. Modern defensive loads perform well, and the round is effective inside 50 yards for most truck gun situations.

.45 ACP

If you want serious stopping power, the .45 ACP is hard to beat. It delivers big, heavy bullets with excellent terminal performance. Many truck owners prefer .45 in 1911s or Glock 21s because it hits hard and runs reliably even when dirty or after sitting in a vehicle for long periods. Recoil is manageable for most shooters, and it excels in close-range defensive scenarios.

.357 Magnum

The .357 Magnum is a favorite among those who carry a revolver in their truck. It offers outstanding versatility — you can shoot .38 Special for lighter recoil and cheaper practice, or step up to full-power .357 Magnum loads for serious penetration and energy. It performs well against animals and two-legged threats alike, and revolvers are simple and extremely reliable in all conditions.

5.56 NATO / .223 Remington

For longer range capability and high magazine capacity, many choose 5.56/.223. An AR-15 or Mini-14 in this caliber makes an extremely capable truck gun. It offers low recoil, fast follow-up shots, and effective performance out to 300+ yards. It’s also relatively affordable to shoot and has massive aftermarket support, making it easy to customize for your needs.

12 Gauge

The 12 gauge shotgun is still one of the most versatile truck guns available. With the right load selection (buckshot for close range, slugs for longer distance, and less-lethal options), it can handle almost any situation. A short-barreled pump or semi-auto shotgun is compact enough for a truck cab while delivering devastating power. Many rural drivers consider it the ultimate “do-all” truck gun.

Why These Calibers Work Well for Truck Guns

These five calibers strike the best balance between power, capacity, reliability, and affordability. They’re all proven performers that have been used heavily in real-world conditions. Most importantly, they allow you to carry enough ammo without taking up too much space in the vehicle.

The Bottom Line

There is no single “perfect” truck gun caliber, but 9mm, .45 ACP, .357 Magnum, 5.56/.223, and 12 Gauge consistently rise to the top for most people. Choose based on what you’re most comfortable shooting and what threats you’re likely to face in your area.

What caliber do you currently run in your truck gun, or which one are you considering?