Are you talking re-trim or re-turn your necks? The answer to both is YES. Re-Trim first, then re-TURN. Remember to check the stop setting on the turning mandrel and do not re-set the cutter depth. You will probably only remove brass on parts of the neck. This is normal and when you are finished you will have very consistent necks.I just saw on the other post regarding neck turning on fire forming brass. So it sounds like something I will try thank you all for your help and input.