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You could always try back focussing on the 7D. Up the shutter to at least 400 if your at the long end of your 70-300, increase ISO to 800 or more as the 7D will handle it and use the back focus button to keep your focus while using AI servo and try going through the aperture range to see what works best with what your shooting. They're similar settings I used at a party in an empty converted barn without great lighting but my lens was a 70-200 f4 non IS and they came out a treat.
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