Have to differ. Used to use my Lyman trimmer and it was a pain in the neck. Now, I only use the Lee trimmer. Lock the case in a shell holder which is locked in a drill, hold the cutter in the other hand and press the trigger. No adjustment necessary and each case is trimmed to the same length from get-to-go. While the case is in the holder, hit it a lick inside and out with a chamfering tool and the job is done. Fast and efficient.