Thread: A couple of new toys comp seating die and Comparator for Measuring sholder bump etc

The comparator... gotta use it without primers, once the cartridge is in the device tighten down with the calipers and give the brass a little spin to help seat it square, eyeball it too to be sure it looks square. And that's the best you can do. That error range is not unlike what I'd get. Some of it is due to inadequacy in the measuring system and some of it will be variation in the brass. If you resize the 2.274s again you might get a little closer to 2.270.