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Y'know, sectional density is great when you're bucking aerodynamic drag. But once a bullet hits meat, high sectional density just means a clean hole right through your target. That's why hunting bullets for rifles are designed to mushroom. Mushrooming destroys that streamlined shape and transfers the bullet's energy to the target instead of wasting it on the landscape beyond.
A round ball is already shaped to transfer its energy to its target. I'm not surprised if it does a good job at that.
I've never heard anyone say that a round ball isn't effective once it hits. I've heard people say you ain't agonna get that 400-yard head shot on a groundhog with one, that's all. But smokeless and bolt actions have got to be better at SOMETHING, right?
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