This morning I shot a large old dry cow giraffe at 150 yards with Barnes TSX 400 gr 404 Jeffery through the heart and shoulder with bullet stuck under skin of opposite ribs. She maybe ran 40 yards and fell over out of sight. I'm guessing muzzle velocity is around 2200 fps considering what I'm reading in loading data. The bullet did open up into four petals but perhaps not split open as much or as deeply as I would have expected. Two days ago I shot a very old bull eland in poor condition three times at 196 meters, all in the boiler room. First shot behind the shoulder broke the opposite shoulder. Two more a little further back and higher almost on top of each other, all exited variously. Still had to wait for him to fall over. Exit wounds only slightly, if slightly, larger than entrance. Therefore, at that range the bullets still had enough gas to go completely through that large animal and exit but apparently not enough to make them open up. Yesterday I shot an old dry cow buffalo lying down at 110 meters well behind the right shoulder (it was quartering slightly away). It jumped up, ran about twenty yards, tipped over, and never got up. Dead by the time we got to it. Blew off ascending aorta etc and both lungs. Bullet lost two petals and two remaining were substantially peeled back. Speed is obviously needed to make those bullets work. So today a brief opportunity presented for 175 meter shot at cow giraffe and I declined. Short time later I declined again at 150 meters but we managed to cut it to 136 meters and I took that one. I believe that was the right decision. .423 caliber is a large diameter bullet even if it didn't open up. But giraffe is a VERY large animal.