Both can work for varmints and some medium game with the right bullet. The 5.56 runs hotter and preserves velocity farther out, but you need to check local hunting laws and confirm your rifle’s chambering. According to Remington’s technical data, pressure and chamber differences mean these cartridges aren’t always interchangeable—even though they look identical. When you’re shopping for hunting ammunition, Scorpion Ammo offers quality options in both calibers that perform reliably in the field.
How the Cartridges Differ in Plain Language
Here’s the thing: .223 Remington and 5.56 NATO share the same bullet diameter and similar case dimensions, but they’re not twins. The 5.56 NATO operates at higher chamber pressures—around 58,000 psi compared to the .223’s 55,000 psi, per Remington’s specifications. The 5.56 chamber also has a longer throat (the leade), which gives bullets more room before engaging the rifling.
What does that mean for you? A 5.56 NATO round often generates higher velocity from the same barrel length, which translates to slightly better retained energy downrange. You can safely fire .223 Rem in a 5.56 chamber, but never fire 5.56 NATO in a rifle marked .223 only—the pressure spike can damage your gun or worse. Always check your barrel stamp before loading up.
What Matters to Hunters
Honestly? The cartridge name matters less than the bullet you’re putting through it. A poorly constructed 5.56 load will underperform compared to a well-designed .223 hunting bullet every time. Focus on bullet weight, construction, and how it behaves on impact at your typical hunting distances.
Energy on target drives terminal performance. A bullet needs enough retained velocity to expand reliably and penetrate vitally—whether that’s a coyote at 150 yards or a hog at 75. Twist rate plays a bigger role than most hunters realize. A 1:7 or 1:8 twist stabilizes heavier hunting bullets (62+ grains) that retain energy better. If your rifle has a slower 1:9 or 1:12 twist, you’ll get better accuracy with lighter projectiles.
Best Bullets and Loads by Game
Varmints and Predators
For prairie dogs, ground squirrels, and coyotes, you want speed and rapid expansion. Light bullets in the 40–55 grain range work beautifully here:
- 50-grain V-Max or polymer-tipped hollowpoints screaming along at 3,200+ fps deliver devastating results on small targets
- 55-grain soft points at 3,000 fps (.223 Rem) give you flat trajectory and explosive expansion out to 200 yards on coyotes
- 5.56 chambers push the same bullet 100–150 fps faster, flattening your arc and helping with wind deflection on breezy days
Medium Game (Deer and Hogs)
Now we’re getting into controversial territory. Some states allow .223/5.56 for deer; others set minimum caliber or energy requirements. Always verify your local regulations before hunting big game with these cartridges.
Where legal, you need heavier bonded or controlled-expansion bullets:
- 55–62 grain bonded or mono-metal bullets with controlled expansion and weight retention
- 62-grain bonded soft points at 2,700 fps handle hogs reliably at reasonable distances (inside 150 yards)
- Shot placement becomes absolutely critical for deer—these aren’t magnum cartridges, so aim for tight vitals-only shots
Long-Range Considerations
Past 200 yards, the 5.56’s velocity advantage starts showing up. Higher ballistic coefficients (BC) also matter more as distance increases. A 77-grain match bullet with a BC around .370 retains velocity better than a 55-grain hunting bullet, even if it starts slower. If you’re set up for long-range varmint work—say, shooting rockchucks at 300+ yards—consider 5.56 loads with heavier, high-BC bullets and dial in your turret accordingly.
Scorpion Ammo’s .223 Rem and 5.56 x 45 selections give you reliable options for both close-range hunting and extended-distance work.
Practical Rifle Setup and Testing Steps
Your rifle setup matters as much as your ammunition choice. For hunting loads, a 16–20 inch barrel with a 1:7 or 1:8 twist handles the widest range of bullet weights. If you’re running a budget carbine with a 1:9 twist, stick with 55–62 grain bullets for best stability.
Before heading afield, test your chosen load:
- Run it through a chronograph to confirm actual velocity from your barrel
- Shoot five-shot groups at 100 yards (you’re looking for sub-2-inch groups at minimum)
- Calculate retained energy at your maximum hunting distance using a ballistics calculator (generally 1,000+ ft-lbs for deer-sized game, 500+ for varmints)
Zero depends on your game and terrain. A 50-yard zero works well for close-range hog hunting in thick brush, giving you point-blank holds out to about 150 yards. For varmints in open country, a 200-yard zero flattens your trajectory and simplifies holdovers.
Short Buying and Ammo-Selection Checklist
Close-in timber hunting? Choose heavier bullets (60–62 grains), controlled-expansion or bonded designs, and confirm your barrel has a fast twist rate (1:7 or 1:8).
Scoped varmint or long-range predator work? Consider 5.56 NATO with high-BC bullets, verify your scope’s turret adjustments, and practice reading wind.
Medium game (where legal)? Test bonded or mono-metal bullets in your rifle first, confirm legal minimum energy requirements, and limit shots to vital-zone distances where you can guarantee placement.
If you’re building a versatile ammunition stockpile, Scorpion Ammo also carries other popular hunting and self-defense calibers, including 9mm, .300 Blackout, .38 Special, .357 Magnum, .40 S&W, 10mm, .45 ACP, .44 Magnum, and .45 Colt.
Conclusion
Both .223 Remington and 5.56 NATO can work for hunting if you match the bullet to your game and mission. Don’t get hung up on the cartridge label—focus on terminal performance, test loads in your specific rifle, and always follow local hunting regulations. The right bullet at the right velocity beats brand loyalty every time.
Ready to stock up? Browse Scorpion Ammo’s .223 Rem and 5.56 x 45 ammunition to find hunting loads that perform when it counts.
