Quick Answer
Different deer species can benefit from various AR-15 calibers, but generally, .223 Remington and 5.56x45mm work well for most North American deer, while larger species like elk and moose may require more powerful options like .308 Winchester or .300 Blackout.
Caliber Selection for Deer Hunting
When choosing an AR-15 caliber for deer hunting, consider the size and species of the deer you’re targeting. For smaller species like mule deer and white-tailed deer, a .223 Remington or 5.56x45mm is often sufficient. These calibers typically produce effective expansion and penetration at close to medium ranges, making them ideal for smaller deer.
Effective Range and Bullet Selection
The effective range of an AR-15 caliber is also crucial when hunting deer. For example, at ranges beyond 300 yards, the .223 Remington’s kinetic energy drops off significantly, while the 5.56x45mm maintains its momentum better. At these longer ranges, a heavier bullet like the 77-grain Hornady V-Max can provide better expansion and penetration, increasing the chances of a clean kill.
Bullet Expansion and Penetration
When selecting bullets for deer hunting, look for ones with a good balance of expansion and penetration. For example, the 5.56x45mm 62-grain Sierra MatchKing bullet has a flat trajectory and high BC (0.285), making it suitable for longer ranges, but it may not expand as much as a heavier bullet like the 77-grain Hornady V-Max. For larger deer or longer ranges, consider a heavier bullet with a more robust design to ensure effective expansion and penetration.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.