JB, I can attest to the A-frames failing to exit the far side on both my buffalo. The killing bullets were found under the skin of the offside shoulder. Ditto for my wife's wildebeest and a both myt zebra. They did exit my hyena, my bushpig, and warthog.
This doesn't mean they lack penetrating capability, though... my 2015 kudu offered me a raking shot (through the side of his abdomen, angling toward the offside shoulder), which I normally would not have taken. However, the trackers and my PH all insisted I had wounded him on my previous shot, so it was either try to kill him at the raking angle or pay the not-inconsiderable trophy fee for a kudu bull and end up eating tag soup. My bullet entered about halfway between ribs and haunch, and was found under the skin of the off shoulder, and blew up both lungs on its way through. On a kudu, that is a lot of tissue to go through, not to mention whatever the contents of its stomach might have been (I suspect it hit liver, not stomach, which is what I was hoping for, but the guts came out in the skinning shed before I arrived after dinner that night). The bullet was only slightly mushroomed, and performed more or less as a 1.1 X Diameter "solid" on this shot.
