I have use the Jam measurement method for years before Eric ever said a word about it. Jamming the bullet into the lands is a REAL measurement. Find your JAM, Back off 20 or 30 thou and start your seating there. Any other measurement is like chasing a UNICORN, a big waste of time. As long as you don't seat on top of your jam measurement, you can never go wrong. If you listen real close to Eric and F-Class John, they are giving away very accurate Trade secrets.I spent a couple hours today trying to get consistent CBTO readings on my Ruger Hawkeye 270 and some Nosler ABLR bullets. The readings are all over the place. I've had more consistent results with some other bullets. I try to be consistent, firm but not too firm, give it a couple taps. I got a few clumps of measurements, but the SD on 30 measurements was .02, if I remember right, and the ES was 67 thousandths! I didn't try burning incense or chanting mantras, but what's the frigging secret for getting repeatable readings with this thing? It must work or people wouldn't have used it all these years. I'm ready to put it away and try Erik Cortina's "Jam Method".