About that...
2a46 is the main gun of old soviet tanks. It has evolved with tank, so original 125mm 2a46 has more than dozen iterations all greatly varying in power, reliability, accuracy and barrel wear: 2A26, 2A26M2, 2A46-1, 2A46-2, 2A46M, 2A46M-1, 2A46M-2, 2A46M-4, 2A46M-5. Well, not so much...