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No size fits them all. The optimum size depends on the reading software/device that's going to be used. I usually have 800x600 covers, because that's the screen size of my reader, but even there they don't look perfect, because the software insists in adding some margins. Then, if the same file if read in landscape, or in a different reader, the cover will have to be scaled.
So, at the end I'd say use whatever size you like and works for you, but maybe 400x600 is a bit on the small side?
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