I have taken my .243 apart and put the .243 barrel back on it. I used a piece of resized fired brass from this barrel to set my headspace, after double checking everything a few times the stroke of genius to check the barrel's stamping hit me. Imagine my surprise to see it lined up exactly as before. I would definitely put it back as before if it shot better and you can verify that you are not 1 whole turn out with your barrel.