You are asking the wrong guy, see attached pix. First I love all things chambered in 45lC. Second I firmly believe you should always buy not sell. Short answer keep it! Should you want to part with it you will find no shortage of folks interested in it. It is steadily going up in value and will continue to do so. You can most likely already sell it for more than you paid for it. It don’t eat much, doesn’t take up much space and continuously increases in value. Hang on to it!