Beware of outstandingmunition.com.. made an order ...paid by Zelle...received text asking for another $200 for 'insurance and background check' asked for refund was refused
This is a great read on how primers are manufactured and the differences between Boxer and Berdan. Also anything else you may want to know about primers.
http://www.exteriorballistics.com/reloadbasics/primer.cfm