This steel 7.62x39mm cartridge keeps its qualities under various climatic and weather conditions independent of the season and at a temperature from -20C to +50C (-4F to +122F). TulAmmo converted from a bi-metal jacketed round to a zinc-coated round, which provides up to 10-15% better shooting accuracy. Zinc coating is a chemical method of surface treatment (galvanizing) which gives the bullet jacket a more uniform and consistent protective layer than that of machine-stamped bi-metal bullet jackets.Specifications:Caliber: 7.62x39mmModel: RifleBullet Weight: 122 grRounds Per Box: 40Casing Material: SteelApplication: Match,Range,TargetBullet Type: Full Metal Jacket (FMJ)Muzzle Velocity: 2330 fps