Cape Buffalo w/ a .25 caliber 117gr bullet. That is pure stupid!! Here are some links to Dangerous game rifles and hunting.
Sure these are opinions, But the guys that wrote them know their stuff.
Roy Weatherby was experimenting when he shot many plains animals, not the most ethical guy. This article spoke of his theory that the shock was the factor that put the animals down.
Qoute: Roy Weatherby, on an African safari, intentionally gut shot dozens of plains animals with a .257 Wby. Mag. rifle in an attempt to demonstrate this theory. Most (perhaps all) were one shot kills. I understand that he even killed a Cape buffalo with his .257 Magnum.
I accept Mr. Weatherby's account of these experiments (that is, that the animals died quickly after being shot), but I seriously question the hydrostatic shock explanation for those kills. Any doctor or zoologist can tell you that the veins and arteries of all mammals are quite flexible. They have a lot of potential to expand or "give." Because of this, hydrostatic shock is very unlikely. To return to the automobile brake analogy, hydraulic brakes simply won't work if the brake lines give when the driver hits the brake pedal. The hydraulic pulse is not transmitted, but rather absorbed in the brake lines--or, in the case of an animal, the veins and arteries.
I am a fan of Weatherby rifles and the .257 Weatherby Magnum cartridge, but my guess is that those African animals simply succumbed to the tissue damage and blood loss caused by the impact of those high velocity .257 bullets. I don't think that hydrostatic shock had much to do with it.