Southern Lights
WKR
O'Connor talking about fragmenting bullets on deer sized animals back in 1961 on bullets he used before WWII:
"With lighter big-game animals, the biggest problem is quick expansion instead of deep penetration. The right medicine is the bullet that expands rapidly and even disintegrates. I have gotten more instantaneous kills on Arizona whitetail deer, which dress out on the average from 90 to 110 pounds, with the Barnes pre-World War II 120-grain .270 bullet than with any other. It had a thin jacket and a soft lead core. When driven at about 3,250 at the muzzle, it was a bomb. I found that a hit anywhere near the heart would almost always rupture the heart with fragments. I never had one of those bullets pass through even a light deer or antelope with a chest shot, and I cannot remember anything but one-shot, instantaneous kills. In fact, I have even seen that bullet stay in the body of a coyote, and I cannot remember hitting a single coyote without killing it instantly."
"With lighter big-game animals, the biggest problem is quick expansion instead of deep penetration. The right medicine is the bullet that expands rapidly and even disintegrates. I have gotten more instantaneous kills on Arizona whitetail deer, which dress out on the average from 90 to 110 pounds, with the Barnes pre-World War II 120-grain .270 bullet than with any other. It had a thin jacket and a soft lead core. When driven at about 3,250 at the muzzle, it was a bomb. I found that a hit anywhere near the heart would almost always rupture the heart with fragments. I never had one of those bullets pass through even a light deer or antelope with a chest shot, and I cannot remember anything but one-shot, instantaneous kills. In fact, I have even seen that bullet stay in the body of a coyote, and I cannot remember hitting a single coyote without killing it instantly."