Interesting read.
Something I have noticed lately is in seating primers. I have always swiped my thumb across the primer after seating and 'felt' for them to be properly seated. But I was having a few rounds that would chamber slightly stiffer than normal. I believe that was caused by the primer not being completely seated. I have since been seating the primer then laying the case (primer down) on the back of my dial caliper (nice flat surface) to verify the primer is fully seated. I have been surprised at how often a primer is not fully seated and will rock back and forth on the caliper. This may also contribute to the primer flattening?
Last edited by centershot; 03/20/19.
