I can easily see .22 cal holes in white target paper at 500 yards with a Sightron 36X scope and a NF 8-32X NXS scope. That is if there isn't much mirage. If the mirage is very bad you really have a hard time finding a single hole but once a group starts to form you can see it.

I'd recommend the Sightron 36X target scope for longer ranges if you don't want to spend s lot of money they are around $400. I like being able to see what I'm doing through the scope rather than rely and spend money on a spotting scope.