Hi,
I have reloaded plenty of 40 S&W on my Dillon 550 with dillon dies, I am sure plenty others have too.
The stock dillon dies work fine if you shoot the roloads through glocks with the larger chambers. I did not bring the size die down untill it touched the shell plate, because I did not want to work the brass more then necessary. If the reloads will be shot in a glock I feel there is no need to remove the buldge, I consider the buldge like a fireformed wildcat, kind of like a Glock 40 wildcat. The reloads did not look real pretty but they worked good and did not rupture, I have even seen some rediculusly or I should say stupid hot velocities with Longshot & 135gr rainers out of my G24C.
It was when I introduced a XdM into the mix that I ran into problems. Not all of the rounds would fully chamber into the XdM. I then trimmed a bit off of the bottom of the dillon die ( I used my lathe ) and turned it into the toolhead so it just touched the shell plate to size more of the case so I could fully chamber the loaded ammo in the XdM.
For what it's worth the fired cases from my Glocks (G24C, G22 & G27) measured .431, fired cases from the XdM measured .427 and fired cases from a barsto barrel from my G27 measured .424.
The modified dillon die sizes the brass just fine to work in the Barsto barrel.
Have a Nice Day,
xpshooter