I use the RCBS Trim Pro and a 3-way cutting head which saves a ton of time. I found that if I remove the handle and take my Rigid 1/2" cordless drill and chuck the shaft into it it speeds the process up quite a bit. I use an old Speer reloading manual (it's the perfect thickness) under the body of the drill to keep the weight of the trimmer shaft. I can probably do somewhere in the neighborhood of 10 cases per minute although I've never actually timed it. The best part is no chamfer or deburr is necessary on the cases.