If you don't plan on harvesting yeast from your primary, I'd say go for it if you're in a bind as long as fermentation has finished completely for the reasons mentioned above. I'm sure you can still probably harvest/wash yeast from your primary if you've used it for dry-hopping, but you'll have a lot more gunk in there when it's all done.
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I could murder a pint! -Lovejoy
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