I think there's no way of knowing, but
The 7.62X54 was used in the First World War on the Eastern Front, the Russian Civil War, World War II on the Eastern Front, and the Korean War, and it remained in service in Viet Nam.
The 7.92X57 was used on both Eastern and Western fronts in WWI and WWII and in North Africa, Italy, Greece, and the Balkans in WWII, and by Chiang Kai-Shek's army before, during, and after WWII.
The .30-'06 was used in WWI in Europe and in all theaters in WWII (Europe, North Africa, Pacific), and in Korea.
The .303 British was used in WWI on the Western Front and in the Middle East, and in WWII on the Western Front, in North Africa and the China/Burma theater, and in numerous other conflicts.
All four were used in both infantry rifles and machine guns.
There have been a lot of 7.62X39 rounds fired but I don't think the scale of warfare compares to the big wars of the first half of the last century.