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The ammo you need to buy is the one that shoots accurately in your 22WMR. To find this out buy just one pkt each of the different makes over time, and test grouping at 50m. And include some Hornady...

Timattalon says above he has 3-9 and 3.5-10 Nikko Gold Crowns - good for your 22Mag. But as northdude notes so too is the Nikko Airking 2-7 you already have. Could be ideal.

If you are after...

You don't need a dearer scope for your 22mag - its a shorter range 0-125m (usually) caliber. The Nikko scopes timattalon is mentioning would be spot on. My Marlin 22mag like yours wears a Tasco...