I don't know about "Best" but I have the Warne and the Leupold QRW (who makes some of the Leupold stuff) and they seem pretty good to me. If you put it on right the first time, the come back pretty close (always within 1/2 MOA for me) each subsequent time. Maybe there are better ones? I don't know

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Those who live by the sword get shot by those who don't.