Clean the barrel good, or dem corrosive primers will ruin the barrel.

Sanding/polishing/oiling/lube works epic wonders for the mosin's bolt, which is stiff largely due to the firing-pin travel being pretty massive (it hits the primer with tremendous force, compared to pretty much any other firearm, ever).

Grouping ain't great, get it in the bull or you'll have a hard time hitting targets even as close as 200 yards with a gun rated for 500 on iron-sights.
-At 100 yards, I can write my name in .22LR, ammunition permitting.