That's a good story!
As many people have noticed, an alarmed or rutting animal is often harder to kill.
That particular pronghorn buck was severely "harassing" a doe. Eileen placed the first shot perfectly at about 200 yards, putting a 120-grain Nosler Partition from her .257 Roberts tight behind the buck's shoulder. Blood started pumping from the exit hole in a stream almost an inch in diameter, indicating one of the major blood vessels had been whacked.
After a light reaction to the sound of the shot, the buck started harassing the doe again. Eileen shot him again, pretty much in the same place, whereupon he quit bothering the doe and eventually bedded down, and then lay his head down. When Eileen and our friend Casey Tillard approaching him, though, his head came up and he tried to horn Casey. Eileen shot him again at least twice with the .257 before the buck finally decided to expire. When field-dressed, there wasn't any blood pooled in the chest cavity, because he had finally, totally bled out, over a period of several minutes.
From that we might extrapolate that a .375 H&H might be adequate for pronghorns--if it wasn't for that doe springbok in South Africa.
