7.62x54mm R BT gzh (BT) is a 7.62x54mm ammunition type in Escape from Tarkov.Ī 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: Green).