I too have found that 158 grain bullets shoot to POA out of my 642's. 135's shoot well to so I carry Gold Dot SB's as my carry load.

I don't reload as of yet, so I buy Freedom Munitions new or reloaded 158 grain's. They're pretty cheap and shoot well. An added bonus to this is that Freedom Munitions also sells a 158 grain Hornady XTP load, new not reloads. I use these as my backup to the Speer Gold Dot's since the GD's can be hard to find. Scuba Oz did a test on the Hornady 158 grain XTP. They did expand out of a snub nose, so I think it's a pretty good carry round....especially if it shoots to POA in your gun.

Fox