Typical wadcutters are barely pushing mid 600fps in snubbies, I've chrono'd them in my 442 and .357 LCR, 620-630fps in both guns avg.
Too slow and too soft, IMO....especially against something with large bones protecting their vital organs.
The Buffalo Bore has a better idea with hardcast and much better velocity, but like others have observed, they will suck in a speedload.
I shot them at the bullseye range not long ago, 25yrds. They both are a little off POA from the smith and Ruger, but they were consistent.
As far as corbon DPX goes, I like the bullet OK, but don't trust the weak sauce ballistics being put up by corbon as of late. I'd pick the 135gr Gold Dot which does right by the chrono and appears to to deliver in actual shootings.