Sky Zero,
I would really just try shooting it about 20 to 30 times first. This will "break up" the "loose stuff".
Afterward, I would use regular brass type brushes with water based solvents, as oil based solvents will not clean out the salts remaining from corrosive ammo. Ballistol works perfectly for this (follow the instruction on the can).
Mosins can be VERY accurate rifles. My Finnish 91/30 (with Tika Barrel) shoots .45 inch groups at 100 yards, regularly.
Enjoy your Mosin.
Respectfully,
Sieger
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