I believe any of those bullets would work if the PH would allow you to shoot that caliber. I have killed lots of American Alligators with just a lil 22 long rifle, of course that was cull hunting at a gator farm. But all aside the skull plate of an alligator or crocidile is very hard, but you are shooting them underneith that, in really the only soft spot in the whole animal. So your 210 grain berger or Mtch king should make a very nasty mess. I also see many brought in the taxidermy shop shot with almost every caliber around, if you want to mount it be very careful in your shot placement, and your taxidermist will have to do some reconstruction, lol.