5.7X28 ammo is relatively small but the fastest centerfire cartridge. Since its development, it has been the caliber of choice for military and law enforcement in more than forty countries worldwide. It is a slight bottleneck cartridge known for its high muzzle velocity. 5.7X28 ammo is also adequate for self-defense. If you’re looking for 5.7X28 ammo for any purpose, find the best piece at Armory Anchor.