I have used it..

..on both my 850 CO2 and the Disco .22...hunting and 50 yard benchrest...

You will really like it for shots on squirrels out past 40 yards...
I often use 18x-20x from 30-45 yards...then 20x-24x at 50-70+ yards...

For your intial sight-in use a big cardboard box at 20 or 25 yards.....it will make it easier than sighting in on a smaller target..

Be sure to just "lightly" snug rings (fasteners) to scope tube....don't over tighten...