I have a Mosin M44, round receiver, Izhevsk manufacture, 1945r date stamp. Good condition, bore is typical, good rifling, dark full length grooves, and it shoots very nicely. Doing some research, I found this on the 7.62X54R website:
http://7.62x54r.net/MosinID/MosinFeatures04.htm
A little over...