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I've used a Wilson case trimmer collet/sleeve.
Put a dab of Dykem on the case, scratch the Dykem with your caliber at the length you want to trim it.
Chuck up the Wilson trimmer collet/sleeve in 3-jaw chuck, put an end mill in your tailstock - advance the tailstock, it'll trim one in about 5 seconds.
Finish the trim in your case trimmer of choice after full length sizing/forming.
Saves some wear and tear, and sure seems much quicker to me.
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