7.62x39mm Brown Bear 196-Grain Subsonic 100 rds. Brown Bear 7.62x39 subsonic ammunition shares the same great features of previous Brown Bear offerings, including a lacquered steel case construction, and Berdan priming for reliable ignition. The Subsonic 7.62x39 ammunition is manufactured to exacting standards normally reserved for military-specification ammunition by the Barnaul factory in Russia.