Kind of a technicality, but you are talking about the CFCD, not the FCD. There is a difference and they make both for handguns.
I have a totally different use for the Lee CFCD (Carbide Factory Crimp Die). I use it on fired brass to full length size. Then I use the normal carbide sizing die to just size the neck past where the bullet seats to. It results in a much smoother case exterior. I'm not suggesting you have to do this, I'm just responding to how I use the Lee CFCD.
For both pistols and revolvers I have never had any issues with passing the pluk or ka-boom test with any lead bullets (without using the CFCD post bullet seating). I only use bullets 0.001" over the standard groove diameter.