Not what you asked, but...
I have never been a user of Corbon, but "DocGKR" at m4carbine.net and others including John Farnam seem to rate the lightweight 110 grain dpx load in .38 and the 115 gr dpx load in 9mm quite highly, at least for use in short barrels with the benefit that they have a bit less recoil in light snub guns. I found the Speer short barrel stuff a bit a little harsh in something like a 642. I am going to try some of the DPX.
I have also read favorable comments on the 9mm version by Stephen Camp, who always seems to be a rational man.
The DPX stuff seems unreasonably expensive to me so I consider it only for short barrels/light guns where the expense may be warranted.