Without doing hours of research, I would say no, 2MOA is the smallest you'll find.
If the dot is too small (i.e. 1MOA or so) it will not be as quick and easy to pick up, which defeats the purpose of having the dot in the first place!
From experience, a 2MOA on a rifle is more than adequate for Minute of Rabbit, as long as you and your rifle are capable of the same accuracy.
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