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The canons are very good at high iso, which means you can happily run 400/800 iso which will help you keep your shutter speeds up. The reason I say that is to run the lens at 300mm you will need to keep your shutter speeds high to be able to affectively use it without camera shake.
Try 1/320th as a minimum and ideally 1/500th when you are all the way to 300mm. you can get down lower with the right technique but you need to be careful.
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