Re: rcbs neck turning tool
+1 on the K&M or Sinclair. I use a Sinclair 4000 with carbide mandrels and produces very consistent neck thicknesses. Best to turn new unfired brass in the initial case prep which will require an expander mandrel in order for the turning mandrel to properly fit inside the neck for a consistent cut. You will need to trim your brass prior to trimming so the cut into the shoulder just beyond the neck is uniform for all cases. Once trimmed, you can either use a FL sizing die or neck die. Dies that utilize a bushing, either FL or neck, are best since you can obtain the desired neck tension. I turn all of my brass for my bolt or SS riflesin the initial prep. It takes a bit of time but is well worth it. A power adaptor increases the speed considerably while also giving a cleaner cut. Be sure to clean neck turner after each cut and keep the mandrel lubricated by either applying directly to the mandrel or the inside of the case neck.