I use the RCBS Chargemaster. The process is:

(I size and tumble in a separate operation. I tumble after I size to remove the lube and clean primer pockets).

* start powder charge
* trim & chamfer on Giraud
* prime
* seat bullet from previous cycle
* Check concentricity
* drop powder in case
* repeat this process

I have to work to keep up with the Chargemaster and I'm within .1 grain every time! There is absolutely no down time.