Skiving is a term commonly used in the cold drawn steel tube industry to remove chatter marks (bad tool setup) on the I.D. surface.
My barrel had osillations, another phenoenon found in seamless tube, created in the piercing stage.
The thing shot ~3" patterns at 25 yds., now shoots ~<1", sometimes cloverleafs.
The original intent was for your group to rifle this barrel but we found the defect and removed them
Life is good.
R