Obukhov State Plant
…Products Some guns made for Tsarist Russia Cal name velocity Comments Used 30.5 cm M07 L/52 815 m/s Gangut class, Imp. Mariya class battleships 30.5 cm M95 L/40 Last on Andrei Pervozvanny class battleships 30.5 cm M77 L/40 792 m/s First on Sissoi Veliky 30.5 cm M77 L/35 637 m/s Like Krupp C/77 L/35 Chesma…