I have two Forsters. One for standard cases, and one set up for 45/70 which requires a different head and collet.To simplify case set-up when switching from one cartridge to another, I keep dummy brass that is set to trim-to length for that cartridge. It only takes a matter of a moment or two to change length to the dummy case and change the pilot if needed. I have checked the newly trimmed lenghts often with calipers and don't think I've ever found a freshly-trimmed case that wasn't right on the money using the dummy to set the trimmer up with.