Why would you be shooting .308 bullets in an SVT?
I could certainly be wrong but I seem to remember someone saying that all North American and western European manufacturers 7.62x39 and 7.62x54R uses bullets with a diameter of .308 because 7.62x51 is .308 diameter. Combloc stuff on the other hand (ie corrosive Czech 7.62x39) is .311 diameter.
Just mic'ed a S&B soft point 150 grain 7.62X54r and got 0.311".
My Norma 180 grain soft point semi-pointed boat tail stuff on the other hand came to 0.308".
Igman 150 grain soft point is 0.310"
1968 marked bxn Czech 180 grain FMJ light ball measured at 0.311"
1989 Hungarian 180 grain soft point steel case is 0.310"
Wolf gold 150 grain soft point is 0.311" (this stuff is by far the most accurate in my SVT, about 2" at 100 yards with no wind)