Usually double, or imperial, beers do not actually have twice the grain bill. Like the bock to doppelbock relationship, it's a stronger beer, but usually not doubled. Doppelbocks may have anywhere from 20% more grain to a full doubling (though this would be rare).
For an IPA, where a typical gravity might be 1.060, I would probably aim for increasing ingrediants by 50% to get you up around 1.090. That would make a great IIPA.
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Double I.P.A. double ingredient bill?
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