Remington UMC, 223 Remington, 55 Grain, Full Metal Jacket, 50 Round Box R23966 For varmint hunting, target shooting, training exercises or any other high-volume shooting situation, UMC centerfire rifle ammunition offers great value with absolutely no compromise in quality or performance. Loaded right here in the USA, UMC rifle ammunition offers the choice of either metal-case or jacketed hollow point bullets in several popular rifle calibers. You'd be hard pressed to find a better value anywhere.