Those two cape buffalo were taken with a 500 Nitro Express 3 1/4 using 570 grain Woodleighs at about 2,150 fps.
In Botswana's Okavango Delta, we pushed a group of five bulls for over half a day from one island to the next mixing low bent-over tracking and crawling on our bellies. We were completely exhausted when the best one finally offered a shot. He was taken with a single well-placed solid from a distance of 40 yards which gave complete penetration taking out the heart. The buffalo group ran 80 yards, turned, and all five bulls faced me and the PH from a distance of about 50 yards. After what seemed like forever but was probably under one full minute, the center bull dropped and the other four bulls ran off. A great completion to several days of hunting.
The other bull on the wall was taken one year later with the same rifle and ammo from the same box. However, the hunt was as different as could be.
This bull absorbed ten rounds in vital areas which could have been covered with the palm of your hand. There were solids from the same box as the previous year and some softs too on my belt. The first solid started a several mile chase. The bull would stop, take a hit from a solid or a soft, then take off again. Thirty minutes later would get another shot which was later confirmed to be a good hit but which the bull was not impressed by. This was repeated several times across the day. Finally the bull stood his ground and took six quick hits from a mix of solids and softs. All the solids gave complete penetration. The softs gave good penetration through the body organs without exiting the other side of the buffalo. The bull was hurt bad from the beginning but was not going to give up. As each round was fired we could see the bull's reaction to it. The bull never went down until the end. When the bull fell, there was no more ammo for the 500 Nitro. When the bull was opened up, could not see how it was possible for him to keep going so long. Couldn't see any part that should have been functioning at all. (No shots were made by the PH.)
.