I have chronographed the following in my 640 - 21/4" (I think)
125 gr Speer GDHP 1159fps From, a 3" M 60 vel 1253
110 gr Win HP White Box 1136
Neither of these loads is hot for a .357, in fact the 110 gr is a very moderate load. However, I don't want to shoot heavy 158 grainers in the j Frame .357 - RECOIL is fierce.
Jerry