I've been working up some "full power" 10mm loads for my Glock 20, using Blue Dot powder and 180gr Blue Bullets. While doing some research and I read on some older posts, that brass prep will help with consistency. Using new starline brass, I worked up my load. Once I had my load, I wanted to do a test. I cut the primer pocks to the same depth, and debured the pocket on the inside, and cut all to same length. I was surprised that the SD drop by a wide margin, from 32 to 12.