cajunchefray
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THIS is an excellent book with a lot practical information. Woods takes John Taylors KO values and develops what is a logical next step by calculating the cross-section area of the bullet, instead of just the diameter."Rifles for Africa: practical advice on rifles and ammunition for an African safari", Gregor Woods, 2002, Safari Press.
He calls this "Relative Damage Potential" RDP and includes a chart of several common African Big Game cartridges. Studying the chart, it makes a bit more sense in cartridge rankings.
He provides the formula as well.
Woods makes clear that these are just calculated factors, and that not a direct indicator of how well a bullet kills.
It's bullet placement, bullet type that kills game.