The items at hand: .41 Short @ .64" case length and .41 Short Double Action @ .77" case length. OALs about the same. Should both of these be considered “.41 Short Colt” for a designation? Am I correct to assume the “Short Double Action” (S.D.A. headstamp) is to indicate a later application of the same round and the case length difference is due to the use of outside lubrication on the shorter and inside lubrication on the longer of the two?