Way back in 1960?s GONRA used to cut those 30 TPI threads on 5/8 drill rod on my boyhood Sears 6x12 "Change Gears" lathe. Used "Allen wrench" boring bars, home made reamers, etc. to make several hardened reloading dies for Auto Pistol calibers, that verked reasonably OK.
(Not exactly RCBS quality however! Chuckle.... Made perfectly shootable ammo though!)