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AFAIK, and I could be wrong, calibre will adjust covers for your reader when it can.
In simple terms, if the cover fills the box in edit metadata it should look good in your reader.
I go generally for around 3x5 ratio (ie 318x480 or 309x475) but I am not obsessive about it.
If a bigger cover looks more appealing (~600x800) I pick that one and so far they look fine on my reader.
Helen
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