My threaded ends are all made from drilled out cartridge cases having small primer pockets. I drill through and tap for 10-32, then gradually file to fit the rod to the case. The rod is J-B welded to the case, then pinned. I do drill the end of the rod for a little relief and use .30 Carbine, .38 Spl., .32 Auto,...and whatever straight walls.
Cheers,
R