Are you plannin to just shoot it, or drill the receiver, rig up a scope mount then complain that it don't shoot straight?
Out of the box so to speak most of these are plenty accurate but generally shoot very high at 100yds. They are also generally zeroed for whatever soldier shot the rifle last. So, who knows where it will hit. Ofcourse, if you are comfortable with adjusting the front sight then it won't be a problem.
If you are going to "sporterize" it, you will probably spend another $150-$200 and be better off buying a civilian rifle for about what you spent ruining the Mosin Nagant.
If you have to have a scope, try a B-Square scope mount, they won't ruin the rifle.
As to power, it is basically the same as a 30-06. Roughly the same projectile and speed.
So, just my opinion, if you want a cheap gun to just shoot deer with through open sights, it's great. If you want to try to save money by turning a cheap military rifle into a civilian hunting rifle, it's a bad idea.
I own firearms not to fight against my government, but to ensure I will not have to.