Another reason that the 130's work better on small deer, whitetail, is that the copper jacket is thinner on the bullet, making the bullet less likely to pass through the deer, and more likely to expand on the thin skinned, smaller deer.
The reverse is true for the 150 grain loads, thicker copper jacket will penetrate deeper and expand more slowly, making it better suited for larger deer, such as elk.
This, from one of my books by Jack O'Connor. I don't believe just anything because a gun writer says it, but, he was a hunter who wrote from his own experiences. Best -
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The Terminator
John 3:16 (I hope to see You over there.)
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