Plain old ball/LRN/LSWC would have penetrated without much trouble -- shark skin isn't all that thick, IIRC; and the scales are TINY, like sandpaper. Now, just how much damage it would have done once it penetrated is another matter.
BTW -- Way back when, I was fishing offshore when I caught a shark -- about a 100 lb'er -- and my father shot it when brought alongside of the boat -- it was a .357 Mag Blackhawk, loaded with .38 Spl JHP's IIRC. Anyway, the bullet easily completely penetrated the shark all the way through, and just happened to clip the wire leader on the way through -- bye bye shark, it was gone.
Point is: sharks aren't very resistant to bullets. No bones, scales are miniscule.