As to the primer mis-feed; my 550B does not like CCI primers of any size. Call Dillon, they may have an answer. Winchesters of all sized feed perfectly. Rod
Our Flag does not fly because the wind blows against it,
It proudly waves because a soldier's dying breath blows upon it.
USAF Forward Air Controller, 5th Spl Forces,
An Loc, lll Corps, RVN, 69-70, Vietnam Vet '69-'73