L.e.wilson cutter
I use a Wilson trimmer, operate the cutter with a small electric drill.
I haven't the micrometer attachment, but find it fairly easy to get the correct length by a few adjustments.
I use a RCBS unit then to chamfer inside and outside, pocket clean etc, it all works pretty well for me.
The main thing is that it's a very accurate way of trimming.
Good luck with your choice.
PS. not sure how much you want to spend or if it's still available? but there was a very nice stainless steel Wilson with the micrometer attachment for sale on the "Stalking Directory" classified reloading page a short time ago.
6.5 55 SWEDE.223 HOWA VARMINT NIKON 8X32X50 -.22LR CZ STYLE-16" .17 HMR CZ AMERICAN-16" SIMMONS AETEC-12G BERETTA A.302,AYA NO 4,BAIKAL O&U