I also started it on a Lee Classic. I found it to be a very limited machine and as lucky enough to pick up a nice used 550 for about half price. When I was using my Lee loader, I was only loading 38sp and 357. I quickly moved on to 9 different calibers. Yes it is addicting! so I agree it's not a good thing to try and watch the clock, and I focus more on each pull, then the number of rounds I'm pumping out. I have noticed in general, I comfortably load around 300 an hour