Well over 30 years. Probably why I've not changed away from the Uniflow. I just got used to doing it a certain way and it works. The micrometer adjustment is fairly new, within the last 5 years, and I really like it. Like I said before, after I get it set for a particular charge weight with a specific powder, I write down the number of the micrometer setting, log it in my reloading record book and the next time I use that load I dial in the micrometer and the charge weight is right on.