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AFAIK the Steyr LP50. Easily 0.1" groups at 10m with match pellets. h ttp://www.steyr-sportwaffen.at/index.php/en/air-pistols/lp-50. It is the multi-shot version of the LP10, which has multiple Olympic medals to it's credit.
I'm sure the Feinwerkbau P58 is right up there with the Steyr. h ttp://www.feinwerkbau.de/ceasy/modules/cms/main.php5?cPageId=158.