Nikko used to do one called an Airking which I used on my rimfires. That worked really well and were priced around the $200 mark. Actually designed to handle the vibrations from air rifles so will handle even big centrefire recoil well. (Airguns with springs are some of the hardest things on scopes...the vibrations are worse than any recoil)
http://www.nikkostirling.com/content/airkinggoldcrown
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