Hornady 366 Parts Diagram [LIMITED 2025]

His gaze settled on the part he’d never needed: the Primer Seater Punch (#43). In the diagram, it looked like a tiny mushroom—a flat face on a steel stem. But the callout box added a warning: “Seater depth adjustable via locknut. Do not overcam.” Arthur had read that note fifty times. Tonight, he realized what it meant. The 366 didn’t have sensors or computers. It had geometry. The punch’s travel was governed by a cam slot in the main shaft. If you over-cammed—if you forced the handle past its natural stop—you didn’t just crush a primer. You bent the punch stem. And a bent stem didn’t show on the outside. It showed in the feel, a year later.

But the diagram told a deeper story. To replace #40, you had to remove the Primer Slide Stop Pin (#41). To reach #41, you had to loosen the Carrier Bracket Screws (#58). And those screws shared a line with the Shell Plate Index Pawl (#53). Everything touched everything else. The 366 was not a collection of parts. It was a grammar of motion. hornady 366 parts diagram

So Arthur did what he always did when a machine lied to him. He reached for the diagram. His gaze settled on the part he’d never

The parts list was not merely an instruction. It was a confession. Folded into the back of the manual, the exploded view showed the 366 as no human had ever seen it: disassembled, weightless, each component suspended in its own halo of white space. The main shaft (#7) ran like a spine through the ghost of the cast iron frame. Around it clustered the cams, the wedges, the wiper arms. Do not overcam

Arthur’s eyes drifted to the upper tier: the Powder Slide Assembly (#85–92). The diagram showed the brass powder bushings nested like Russian dolls, the metering insert (#88) drawn with an almost anatomical precision. He remembered buying the machine used, finding an old #88 clogged with Unique powder that had turned to lacquer. The previous owner had never cleaned it. Had never looked at this diagram.

He reassembled the 366 by the diagram’s reverse order. Lower tier, then upper. Cam followers greased. Pawl timed to the shell plate’s detent. When he finished, he dropped a primed case into station one and pulled the handle.