100mm D10T

MrVic: I swap between it and the 85mm variants. Tho I am more fond of the 107mm and wish I could use it on the IS line sometimes. My big concern is the first rounds of 122mm are only 175mm pen. That and once in the IS-3 its 55k ish exp to get a pen above 175 and your dealing with Tiger II's
overall the heavy guns for russian tanks get to me at times but then again no tank is perfect