7.62x54mm R BT gzh

 (BT) is a 7.62x54mm ammunition type in Escape from Tarkov.

Description
A 7.62x54mm R BT gzh (GRAU Index - 7BT1) cartridge with a 9.2 gram armor-piercing tracer bullet with a pointed heat-strengthened steel core with a bimetallic jacket, in a bimetallic case; intended for target designation and fire adjustment in battle (Trace color: Red). This BT bullet (Bronebóynaya Trassíruyushchaya - "Armor-piercing Tracer") it's an improved version of the used in the 7.62x54mm R T-46M cartridge, since the lead core was replaced by one of heat-strengthened steel, providing automatic firearms with penetration capabilities against basic, intermediate and specialize ballistic body protections as well as providing a significant stopping power effect.

Trivia
While the item description says that the tracer color is red, its green in-game.

7,62 x 54R 7BT1 7,62x54R 7BT1 7.62x54R 7БТ1