The cool thing about black guns (aka modern sporting rifles, or MSRs) is the ability to shoot a variety of calibers through the same platform. You can literally start by plinking with .22 LR ammo using a conversion-kit upper and end up hunting whitetail with an upper chambered in .450 Bushmaster. Then swap it back to 5.56mm for self-defense. Take the big-bore platform in 7.62mm, which is perfectly suited for hunting medium to big game. Perhaps you want to gun up for long-range shooting with a 6.5 Creedmoor upper. The firearms industry has created a wide spectrum of calibers for the AR, each chosen for a specific purpose.

Ammunition manufacturers understand the need for us to feed our machines and are constantly improving ammunition performance, particularly in the AR platform. Here is a look at some of the newest AR cartridges that push the envelope on bullet design and downrange performance.

For more information about the AR cartridges featured in the gallery above, please visit the following sites.

Aguila 300 BLK FMJs

Black Hills

Federal Fusion MSR

Federal Edge TLR

Federal Trophy Copper

Hornady Black

22 Nosler

Precision Delta PDP Pro

Prime Match+ Ammo

Sig Sauer HT

Speer Gold Dot G2

Wilson Combat

Winchester Super-X Subsonic

This article was originally published in “AR Rifleman” 2018. To order a copy, visit

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