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Thanks for the info beprepn. I guess I'll stick with my 700 grain arrow at 10 grains per pound.

P.S. I'm sure that you've opened a can of worms.
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Presumably 10 grains per pound would be even better!

I don't think there are any big holes in what I've said - in fact, this may have been the conventional wisdom 30 years ago.

I asumed that the bow got 11% more efficent at the higher arrow weight. I had bow reports from 1996 for 3 bows that gave 10.3 to 13.5% increase in efficiency when going from AMO to IBO arrow weights.