Ok for the brass that was oversized for chamber,all is not lost Get a bullet puller,either kinetic or press mounted. Now pull the bullets out a bit,does not need to be too much. If your using the 200 grain Hornady's, I would pull the bullet out to equal one or two meaures of the cannalure. Now set your bullet til the action just closes on the round. This should fire and give proper headspace. Now process your fired cases the same way without pushing the shoulder back. This would be a partial size on the case.