The Mosin Nagant 91/30 rifle uses the wrong ammo type in game.
The type of ammo you have set up for the Mosin to use in the game is 7.62x51. This is completely incorrect. The civilian designation for that ammo type would be .308 most commonly used in AR-10 rifles, M240B LMG's and a handful of other weapons.
The CORRECT type of ammo for a Mosin Nagant 91/30 would be 7.62x54R.
It is a slightly larger round, and R stands for rimfire.
If this game is to focus on realism, then this change is one that must be made.
If you are wondering how I know this; I own a Mosin Nagant 91/30 in real life. 7.62x54R is the type of ammo it uses, with no exceptions.