Yep, a few years back I shot a whitetail with a 270, 150 grain Sierre Game King Premium Federal. It was a clean shot but the deer still ran at lest 300 yards in an open field, when dressing it there was adequate damage to the heart and lungs but we found the copper casing in the skin at the small exit would and no lead and it looked like it mushroomed funny to one side.
Thats a new one to me. If you had that much damage to the heart, then it shouldn't have went no 300yards. Sounds to me that was a super deer.
I have shot dozens of deer with them and 130gr, and have yet to see anything like that. Shoot when I was a kid, I shot a deer with a 303brit and armor piecing and penciled thru, and he only made it 100 yards. I guess theres all sorts of things I have never seen before.
With velocities below 2800fps, I always thought it was a ideal deer bullet.