Phil Massaro tackles the 6mm ARC, a military cartridge that's equally at home in the hunting field.

The result was Armalite’s AR-15 rifle, chambered in .223 Remington, propelling a 55-grain bullet at 3,250 fps. Two years after its submission to SAAMI, the U.S. Army adopted Armalite’s AR-15 rifle, ...

The gun is the weapon of choice for many mass ... They don’t hold enough gunpowder to match the velocity of the .223. Any bullet can kill, and instantly, when it hits a vital organ.

Hot-shooting 22-caliber cartridges are nothing new, so what might newcomers like the 22 ARC or 22 Creedmoor offer that is different? After all, classic medium-sized cartridges like the .243 Win., .250 ...