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The old addage of 2" per pixel is now a bit out modded. Current thinking is that over sampling is fine and under sampling is not great. You may find that you are slightly under sampling with that setup and it could cause some square stars. The problem lies with the focal length of the scope rather than the pixel size in the camera. It is worth a try though as this will present a nice wide field. If it does not work you can always sell the scope.
The ST8300 is great for galaxy work when combined with a longer focal length scope. I currently have my setup at 0.7" per pixel and this allows a great deal of sharpening before it becomes a problem.
With a slightly shorter FL you will find this sensor will perform well. Several chaps here are using 700 odd mm of FL and achieving really nice results.
Best of luck.
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