Frontier is Hornady's take on military pattern ball ammo: a 55 grain FMJ moving at 3,240 fps, the classic recipe 223 shooters have burned through for decades. It runs in any 223 Remington chamber and shoots clean enough for carbine classes, drills, and long afternoons on steel.The 250rd can is the practical part. Loose rounds in a latching ammo can store better than a stack of 20rd boxes, and the can gets reused long after the ammo is gone. Recent runs have gone out as an anniversary package with a Hornady hat and sticker inside.