Yes, the jam nut hits the case neck with no bushing in it. If I remember correctly, you will need a .331" bushing. You can use rcbs and Redding bushings. Once you get the bushing, just unscrew the stem and drop it in with the most beveled side down. You can adjust the jam nut so that you leave a few thou slack and allow the busing to center over the case neck. While doing this, adjust the decapper so the pin sticks out about 3/16" inch below the base of the die. (Just enough so it deprimes. Once you have a case neck sized, load a bullet and measure the neck o d about Midway down the neck. It should measure around .333 with Norma or RWS 270 brass. You might want to get a couple bushings so you can tweak neck tension but normally about .002" fit works well. I.e. .333" neck o d loaded use a .331" bushing.
