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Old July 16, 2021, 06:33 AM   #2
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 40,780
Because it's not the same cartridge as the 7.62x54R Russian round. Case dimensions in a number of areas are different (the Finnish case is slightly shorter) and the standard bullet is very slightly smaller in diameter.

Since case head and rim thickness are the same, I THINK that you can shoot either round in a rifle chambered for the other.

It's a situation not unlike the 7.62mm Tokarev vs. 7.63 Mauser. The rounds are VERY similar in dimension, but not identical, but in most cases they will interchange with no problems.
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