Probably nothing wrong with the brass or primers. If you can get them to fire, the brass will fireform to fit your chamber. Once that is done, make sure when your resize that you don't push the shoulders back too far and run into the same problem again. Take what you have already loaded, pull the bullets out some to increase the OAL. (bullets jammed into the lands) If there's no problems with the primers, the rounds should fire and the brass will form to your chamber.