I have been carrying my 457 and others (
including my 547 revolver which is twice as heavy) in the DiSantis Nemisis pocket holster.
THE NEMESIS Holsters, Belt Holster, Taurus Judge Holster, DeSantisHolster.com
The 457 is listed in the ordering form at the link above.
But I don't pocket carry, I carry AISW and the high outer friction holster keeps it in place nicely. For the 457 a #13 Nemesis fits perfectly.
The advantage of a clipless holster is that it can be easily re-positioned for more comfort or better concealment.
digiroc