You can blow the heart to shreds and the lungs to soup, but what matters is how much oxygen the muscles have on board. Unless you blow the brains to grey-red goo, you're not guaranteed an instantaneous drop. (If you get one, all well and good.)
That being said, almost everything I've read on big game hunting has hammered home the same point: DO NOT take the head shot; take the guaranteed killing thoracic shot. Which you did. Blowing the heart half to bits and wrecking both lungs is about as much as you can ask for from any bullet. With damage like that, it's academic whether it makes it out the other side or how much weight, jacket or core it sheds. It's done its job perfectly.
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