Now I have to ask the question that I have had for a long time after reading this topic and many like it in all of the reloading forums about this bulge and the use of the M die.
I do all my pistol reloading on some form of Lee press, either turret or progressive, and I always use a Lee Powder measure. Either the Auto Disk or the Auto drum, which needs to be used with a powder thru expander just as the Dillon and Hornady powder measures do. Now from what I see every time is that this "M" die has a solid expander. so in order to use this die how would you use a powder thru die Powder measure? Do you need to add a step and a station before the powder measure to expand the case?
I just accept the fact tat the tooling that I am using is not going to remove or eliminate the bilge.