The AR is an extremely tough, reliable, and modular platform. The AR 15 rifle can accept dozens of cartridges, often with no more than the change of an upper receiver and magazine. Different calibers feature a wide variety of ranges, power, and uses. Whether you’re buying your first AR or looking for a new cartridge to try with your AR 15 chambered for 22 LR or 50 Beowulf, read this guide.
50 Beowulf
How Do You Plan to Use It?
The best way to find the right caliber chambering you should choose for an AR 15 is by determining what you plan to use it for. You should be certain about whether you plan to hunt, train, shoot long-distance, or plink around and have fun before you choose a caliber, and certainly before you buy an AR 15.
Consider the Practical Stuff
There are some impressive chamberings for the AR 15. There are massive cartridges; hyper-fast, long-distance cartridges; subsonic, suppressor-friendly cartridges; and more. Many of those sound, and would no doubt prove to be, super cool and fun to shoot. Many of them can also be very hard to find, particularly during ammo shortages, and can be very expensive.
Popular AR 15 Calibers
223 Remington and 556 NATO
The vast majority of AR 15s are chambered for the 223 Remington and its military sibling, the 556 NATO. You will find these cartridges in a vast array of powder loads, bullet sizes, and specialties. They offer the most diversity and are likely to be the least expensive. Great for training, target shooting, and plinking.
458 SOCOM and 50 Beowulf
While they are not identical ballistically, the 458 SOCOM and 50 Beowulf are massive thumpers as cartridges go. If you need a practical defensive option for fishing or otherwise spending time in grizzly bear territory, for example, an AR 15 chambered in 458 SOCOM or 50 Beowulf makes sense.
300 Blackout
The 300 Blackout cartridge was designed to pack more punch than the 223 Remington or 556 NATO cartridges at short distances. Usually subsonic, 300 Blackout is optimized for use with a suppressor. That combination of characteristics has made it very popular with those who hunt medium to large game within several hundred yards. It is particularly beloved by feral hog hunters who like staying quiet.
65 Grendel
The 65 Grendel has emerged as one of the most popular cartridges for the AR 15 platform, and is widely considered one of the most efficient. The 65 Grendel is said to remain supersonic for truly impressive distances, making it a top-tier choice for long-distance shooters. Deer hunters who want to be able to cleanly and reliably bag their game at long range often rely on this cartridge.
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