I got into brushing the inside of the necks before annealing. The brush is screwed into the Lyman prep station. I can’t look anyone in the face and say that it works, it’s more of a mental thing. The brushing of each one makes me feel like I’m one more step in consistent brass prep. My full routine is this-
Deprime, sonic clean, brush, anneal, size, trim if needed, champher debur, sometimes neck turning, sonic clean to remove lube and whatnot, brush again, prime, powder, seat.
I did see a video on the inter webs of accuracy increases when brushing before seating vs not, and look at it as another consistent step. I can’t say if it works but I can say it doesn’t hurt.
