When you are at war, and the enemy is at your gate and you only have 15 minutes to make a rifle. You wouldn't care either if the bore was straight or if the rifling was any good. They made them as fast as they could!
About the best accuracy that you can expect - would be to hit a pie plate at 100 yards. Thats all the more that gun was intended to do.
I would expect that with a wartime
Russian rifle, but Finnish rebuilds are in an entirely different class when it coes to workmanship and accuracy. The Fins still use rifles built on mosin nagant receivers for sniping.