Primers also have incredibly slight dissimilarities in diameter creating seating resistances visible - diameter Proportions differ less than .001 but even this small quantity is often seen on seating. My previous primer seating chore indicated that WLR primers took significantly significantly less hard work to seat than CCI 200's. Also, https://cristianqsrpo.ssnblog.com/31135313/examine-this-report-on-federal-large-pistol-primers-no-150