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In the Calibre mobi output preferences, make sure you do not have the option checked to "Rescale images for Palm devices" when converting.
If it's just a plain old gif/jpg/png image used as cover art, then the 600x800 image should fill the whole screen. If it's an inline image that's included in an html page, the image would need to be a bit smaller. I believe I've seen 520x622 listed as the largest inline image size?
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