I have not shot it yet due to weather
Those suckers are made to be shot in the winter. Germans found that out on the Eastern Front. Don't forget the "Winter War".
You can tell if it will shoot by looking at the bore. If you have a decent bore it will probably shoot. Assuming you have a good bore, the I believe the difference between a good Mosin and a bad Mosin is the shooter. If the shooter is willing to put in the time and effort, they are shooters.
One can learn to shoot the Mosin, like most guns, without spending a great deal of money. That being lots of dry firing. Get some stripper clips, load some dummy rounds and practice loading and firing (dry) in different positions.
That will also loosen (smoothen) out the bolt. Practice working that bolt.
Odd thing I've found about the Mosin is it seems to be easy to shoot off hand (standing). I think its the long barrel that helps dampen the movement.
I don't shoot surplus ammo out of my Mosin. I bought a bunch of Winchester factory stuff to get the brass and reload for it. I got mine to use in CMP GSM Vintage Military Matches. You only have to shoot to 200 yards so I load light.
Most Mosins shoot high, if thats the case with your rifle let me know, I'll tell you how to fix it while keeping it "as issued" per CMP Rules.
One reason I like the Mosin is its cheap (price wise), and will allow anyone to get into competition without breaking the bank.
They are fun to shoot and if one is willing to put in the effort, they can shoot very will.