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The Finnish D-166 cartridge is a 7.62 x 54R with a 200 grain bullet. The rifle has a longer throat. The chamber is a bit longer. Regular 7.62 x 54R ammo can be used in it, but not the reverse. You won't likely find any D166 ammo anyway.
Your M39 uses standard 7.62 x 54R ammo. Rumour has it that the Finn's would not issue a rifle that wouldn't shoot into 1.5" at 100 meters. That's outstanding accuracy for any non-sniper milsurp rifle.
Go here and note the right side menu. Lots of useful Finnish M39 info for you. http://www.surplusrifle.com/finnishmosin/index.asp
No, I'm not following you around. Snicker.
