I am an experienced reloader but have never loaded for the 40 S&W. A friend bought some commercially reloaded 40 ammo & had issues with it sticking. I just wanted to make sure I have reliable , dependable smooth feeding ammo. The 40 I have is a Ruger .Don't have a source for the smoothing die but ..... I was given 500 pieces of 40 S&W brass from a local LE department that just ran a requal course. Most of the guns used in the course were Glocks, but not all of them. I expected to have some problems reloading them for my HK USP40. However, I ran all the brass through my regular set of dies and didn't experience any problems at all. Are you sure you need a smoothing die?