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I normally use about .050"-.075" larger than the bullet diameter for baffles. I've not had any baffle strikes even when swinging the rifles for lead on moving targets. I don't think the movement of the rifle is going to affect the chance of baffle strikes unless you're in a big hurry or have a very very thin barrel. The whip of the barrel due to pressure is a real effect but shouldn't cause strikes.
One last thing to be aware of is that you don't need a friction fit of the bullet to the baffle. Holes with plenty of clearance won't affect the sound level enough to make it worth worrying about. Check some of the suppressor boards where guys are shooting .243 through .338 cans or 9mm through .45 cans. They still work great and in some cases have better sound level drops with the smaller bullets than with the ones they were made for.
Hope that helps
Frank
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