Both Texas and Idaho are a bit to lenient in my book as well. In both of these states, one can hunt big game with a .25 ACP or a .22 Hornet! In Iowa, one can use a .40 S&W, but not a .357 Maximum.
Iowa disallows the .440 Cor-bon because it is not a straight case (what *do* they have against bottle-necked cartridges?!) and Wyoming disallows it because it is not one of the 7 cartridges on its "approved" list.