Well, you need a springer rated scope because even medium springers will tear up a centerfire-only scope. This has been proven over and over with expense and sadness, because of the double-recoil plus torque thing going on in a springer. You can't tell a .308 shooter this, but airgunners know.
At the lower end, the Centerpoint AO series is a form of Leapers that has held up well on many high powered springers. I have the 4-16x and it has moved across several spring rifles with no problem.
I have never actually had a Leapers branded scope. I have a Tasco Golden Antler on a B26 that I like with no problems to report, but I know they can choke on more powerful spring rifles.
I thought my BSAs were a little better than the Centerpoint, and they are also springer rated and also AO.
I became a Hawke fan, because it is a lot of springer-rated scope for the money. I love the 30mm Eclipse SF and have several AirMax scopes. They are my best airgun scopes, but not the best available. I still think they are a great value for dollar choice and I enjoy dealing with them. They are real people who stand behind what they sell.
I also don't have a Bushnell yet. I am working my way up the dollar and value ladder here, but there are many spring-gunners who swear by the upper end Bushnells. I don't think they have as good a reputation for warranty replacement as Hawke, and I find the Bushnellmodel line up confusing. The higher end scopes that are springer rated are reputed to be verygood. I think it goes Sportsman-Banner-Trophy-Legend-Elite but they don't seem very clear about what is springer, and what is not.
Same problem with Burris. Here we have high priced scopes with good reputations that almost totally ignore airguns in their rating system. They seem to equate "airgun" with "rimfire", but they do have AO scopes. For that kind of money I would like to know what I'm getting.
The only Nikon (Monarch) I had was a disaster on the mildest powder burners. To be fair, it was early in their gun line in the US, and they did replace it. I would not put one on a high powered springer but they may have changed. I hope so. Try finding any mention of air guns on the Nikon site.
Then there is Leupold. I have one really great Leupold on a .270 but have not seen fit to make that investment on an airgun yet. The Leupold EFR series is as good as many FT champs need but I just don't need one that badly. Theyseem to bethe best of the big brand scopes without getting into 4 figures, and brands commonly found in jewelry stores (Swarovski, Zeiss).