Had an issue yesterday while testing some new loads in my 6.5x284 I FL sized my brass for the first time after having an issue with hard bolt closure. Basically just sized, chambered the round and resized again until the bolt closed with the normal resistance. Loaded like I normally do with Norma brass and Federal 210 primers. Loaded 9 rounds. First 3 shot fine. All the remaining 6 were mis fires. Firing pin just barely made a mark on the primers. Cycled the them again and was finally able to get 3 of them to fire after a few more misfires. Any thoughts as to the problem? At first I thought maybe since I FL sized them, but the first three were just fine and all 9 were sized the same.