AmmoSeek.com doesn't vet or endorse any retailer outlined on This page. Also, retailers' Web pages can adjust at any time. Deciding on the suitable primer size will depend on the specific requirements of your cartridge you are reloading. Usually refer to a current and reputable reloading handbook for direction. 3. https://griffincnwgo.tinyblogging.com/a-secret-weapon-for-buy-fedral-primers-75677111