What is the best way to go about removing the bluing from a SxS set of Barrels?

I have a 1920's set of barrels that were reblued and the prep prior to the previous reblue was not done well so that they do not look right. I thought I might go ahead and remove the current finish and polish the exterior myself before sending them out for a refinish by a professional. I have have done it once before on a set of damascus barrels with wet sand paper, but thought there might be a better way.

Michael Dittamo
Topeka, KS