Hitting them behind the shoulder has worked fine for me in Africa.
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This impala maybe went 80 yards full tilt before tipping over. I was concerned because I knew as soon as the trigger was pulled the bullet hit a bit further behind where I usually put them. Clearly still clipped lungs. It was exactly broadside when I shot. I culled one during the previous safari behind the shoulder and it didn't run thirty yards before falling over. PH asked why I didn't hit it in the shoulder as directed. "Why waste the meat? This is a slaughter animal." His response: "We don't worry about that here." Well, okay.
I have been on hand when thirty African animals were dressed in the field and I have personally dressed I'm guessing at least 200 deer, moose, pronghorn, and elk. If there's a difference where the vitals are located, it's not much difference. Why would they be different? Both NA and African animals run from prey, fight with each other, jump, climb, and leap as needed. Most of our game were originally from the plains, even moose and elk. Civilization forced them into the mountains.
If I decide to take these bullets, I'll be sure to aim for bone. Not anticipating long shooting. Not with 30-06. Will see what it does at the range.