I know this thread is six years old but............

Yes the 5.0gr of Unique with a HEAVY crimp does give me a "FBI load" in my little snub nose and I do use the lighter load a 822fps for SD use for
less recoil and wear and tear.

The scary part is that, Lyman and others even state that 5.3 grains of Unique can be used and list it at 18,500 pressure .

I'll pass.