The Ammunition For the test, 10,000 rounds each of Federal, Brown Bear, Wolf, and Tula ammunition in caliber .223 Remington were used. Each brand of ammunition used a 55 grain full metal jacketed bullet with a lead core. The Federal 55gr .223 ammunition featured a solid copper jacket and a brass case, while the other… Read More »Brass vs. Steel Cased Ammo – LuckyGunner Labs