Jaime, good to see this. When you start reloading , I got the winning load that will take you to 1000 yds. As surplus ammo dries up (spam cans of it are scarce to find already), you'll be faced with reloading as the best way for ammo and it will provide the most accurate ammo as well. Your results with surplus show the rifle has accuracy in it but remember better ammo flies better.
The PU sniper has increased in costs now and a restored one as yours is valued more than the sum of the parts...this was not the case when I restored an ex PU, in that era a few years ago there was enough real PU's for sale at low prices and by the time you built one, it cost you pennies less than a real one. Today PU are not as common to find for sale and they are in the $800 region and a fine restoration will easily bring in $550 on resale market. That will only climb as PU's climb in value if the restoration is done with top condition original parts.
Orignial Russian PU scopes and mounts are getting harder to find and that won't change. Building a restoration / reproduction today is far tougher than 5 yrs ago. Like any WWII sniper scope, the supply is finite and vanishing.