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I think the shank between the bands needs to be sufficently smaller than bore diameter in order to give the displaced metal somewhere to go.
This goes without saying because otherwise the bands serve little purpose. Also, a bullet whose shank does not contact the rifling in one gun may in another.
I agree, but think the shank should be quite a bit smaller. In a 30 cal for example, if the band is .004" high (.308" groove and .300" bore nominal barrel), the groove between equal width bands should be at least .004" deep, that is .296" or less, not just .300", in order to give the metal a place to go. This would also help with barrels that don't conform to todays cip specs.
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Re: OSR, Double Damage and Barnes' Response