Our Swage Rod Backer/Case Mouth Expander is made from D-2 tool steel, then through hardened, not case hardened, to Rockwell 58-60C for maximum life.
Expands case mouth to ~0.405″
Bullets tested below sit squarely, and have a “suction pop” sound when pulled out by hand.
The rod MUST be fully bottomed in the case, or no, you will not get a proper bell. If you can see shiny when fully inserted, that is not correct.
Tested with 9mm (0.400″/0.401″) projectiles from:
Rocky Mountain Reloading (RMR)
Bayou Bullets (Donnie Miculek, brother of Jerry)
Required but not included:
Dillon Swage Backup Die Body p/n 12184
Dillon 9/16×18 Lock nut p/n 13483