I have been neck turning for many calibers for years starting with the old Marquart neck turning tool. I have since purchased K&M tools as their pilot turn mandrel swap out with the Marquart, a great advantage for me. More recently I have gone as well to PMA neck Turner, 21st Century and Sinclair. All of these newer Case neck tools have their own unique advantages and neck expanders and pilots or mandrels. Some reloaders prefer one over the other brand but I see advantages of each! My preference for specific calibers is the proper cutter( definitely Carbide) and turning arbor or pilot(Manderel) also in carbide. This is not for their longevity but for the ability of carbide to maintain its dimensional stability and heat resistance to friction. K&M has recently added specific angled cutters to their line of neck turners. I believe in maintaining the specific angled cutter for a specific class of should angled cartridges. I use 23º for my .300 B.O. or .223, and the proper corresponding 20º cutter for .243 Winchester. Any other cutter larger or smaller in angle tends to undercut the shoulder too much when attempting to prevent the “donut” bulge. K&M offers slightly larger by 3º on most of the shoulder angles which now works for me over their older standard 50º cutter angles.K&M also offers their Carbide “cutting pilot” which serves a dual purpose of being a turning mandrel and internal remover of a possible “donut” because the shoulder was not cut into slightly in order to prevent it.Again, each reloader has their preference and I prefer properly matched cutter angles to their family of shoulders. Ted Bates in Fort Wayne,IN
