In reply to:

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The big bore shells are basically straight walled but the powder volume is a signifigant issue as anyone knows if they start burning more powder for hotter loads in their doubles

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You do not have to create hotter loads to increase the recoil.
A change in powder buning rate can and often does significantly alter the felt recoil even when the velocity remains the same.
This is why some shooters prefer 4350 to 4831 in big bores like 470, 500 NE and others as the felt recoil is less with the slightly faster 4350.

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