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What sort of focal length and f ratio are you operating at? The sorter and faster the better. 50mm at f2.5 would be great. You could shoot for 15 sec for each shot and take 40 or 50 of them then easily. The offset from star movement won't be too bad for that period of time. About 25 min for 50. In that time the sky will have moved around 7 deg. Using a 50mm lens you will have a field of view of 25 deg x 16 deg with a 300D. Plenty of space to crop out the edges.
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