Jeff,
I've been using the .257 Weatherby for a while now, and while I've seen impressive bang-flops with TSX's on pure rib shots, have also seen animals go a ways. One of those, however, was a pronghorn where the bullet apparently didn't open up much, if at all, and the buck went around 250 yards before falling. Lately have been using the 120 Partition at 3300, which so far seems to drop them quicker, but of course requires careful placement to avoid losing lots of meat.
By far the highest percentage of animals dropped with rib shots have been with Berger VLD's, from various cartridges at 2800-3100 fps. But even then an animal will travel a ways now and then, just like they will with any cartridge/bullet combination. Which is why I'm always skeptical when hearing about any magic combo, especially when the evidence is only 2-3 deer.
