Remington UMC Features Loaded right here in the USA UMC rifle ammunition offers full metal jacket ammo in several popular rifle calibers. You d be hard pressed to find a better value anywhere. Remington UMC Specifications Brand: Remington Ammunition Category: Centerfire Rifle Rounds Caliber: 300 Blackout Model: UMC Bullet Weight: 150 gr Rounds Per Box: 200 Casing Material: Brass Application: Plinking Bullet Type: Full Metal Jacket (FMJ)