As Ken said, you will most certainly cover the $120 investment with the realized selling prices of the vintage double barrels by knowing wall thicknesses.
You will also avoid potential liability for a. selling an "intrinsically unsafe" product if something bad happens or b. something bad happens after the purchaser modifies the barrel. Selling the barrels "as is" is no protection.
http://www.brownells.com/gunsmith-tools-...-prod20463.aspx

Are the Hunter Arms barrels for a Hunter Arms Fulton, or a L.C. Smith? If a Smith, the steel should be marked on the bottom of the tubes

Crown trademark


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