IIRC, the Lee website has updated the list about which primers are Alright to utilize. They now seem to one out FEDERAL specially: Or, take it to the gunsmith for restore. You failed to say no matter whether it misfired on factory ammo or handloads. If it's handloads, that is https://winchester-400-primers-5080123.blog5star.com/32279618/5-simple-techniques-for-large-rifle-federal-primers