I'll tell you what, I shoot the longest range with a caliber that's not supposed to be able to do it and sometimes it turns out not too shabby and I'm a believer in annealing before every reload so that I get consistent bullet seating depth and consistent bullet release from every round, plus the icing on that cake is the extended brass life: the brass used in the video for testing was some OK but nothing special Hornady brass that I got 19 reloads out of before I retired it because I was getting 10% split necks. And the annealer's beau coups faster than annealing by hand.

I'd never thought about it but it does look like a Geneva mechanism however it's really just one slot to deliver the brass into the heating position at the right time and then another to remove it at the right time integrated into the brass roller. The rotors are kept synchronized by the unseen timing belt and sprockets driving them. Be sure to run some tests with Tempilaq to determine your timing - most of the videos of home built annealers way overheat the brass and that's a bad thing to do.