Can a katana cut a bullet in half?

Yes the Katana is very much capable of cutting a moving bullet in half, in the right hands a Katana can cut through anything.

A katana most certainly can not cut through anything. It is no better then any other well made sWord out there. As for the question-anything of sufficient hardness and thinness could cut a moving bullet in half, so yes..a katana can cut a bullet in half.