I use the 40S&W's to make into the 41AE's use the 41 mag lee dies, use the steel lathe to cut the rim down, push the 41 mag 210 grnr bullets in and fireform the shells, than you are ready to use the 40S&W reloading book, basicaly the 40 kicked the 41ae out, basicaly same reloading info though, these work fine in my Uzi carbine, I do the same thing to the 45acp small primer brass to (turn the rim down to 9mm) so I can use the same bolt and mag, All I do is change barrels to change cals, cals are 9mm 357sig 400 car bon 45acp, with the exception of my 22 conversion