6 mm Nikonov, 6 mm Russian XPL, 6 x 49 Russian XPL Abakan project, 6 x 49 Unified, 6 x 49 Unified ??? (from Barnes), 6,2 x 48,7 Russian XPL AP, 6,25 x 48,6 Russian Nikonov, 6,3 x 49 Russian XPL, 6,4