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You can go to Remington (and I'm sure other sites, too) and compare balistics of 2-3 calibers. Here is a comparison of 150gr Remington 30-06 and 7mm Rem Mag cartridges. Note, though, that at least in Remington, the 30-06 is available in much larger bullets than 7mm.
I don't think you can go wrong either way.
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