You can learn a lot here:
http://www.rimfirebenchrest.com/articles/parallax.html
If you understand a little math, you can use what you learn from the link above to set up a spreadsheet that will tell you the maximum possible parallax error at any distance depending on where your scope is set parallax free.

I'm 99% sure Leupold will tell you any of their scopes may be used on a spring piston air rifle, but I would ask them.

I think there is a mechanical limit as to how low they are able to set the parallax free distance, and I believe it is close to 50 yards. Hope this helps.

Gun Doc

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