In continuation of a previous comparison of the influence of melt practice and strain amplitude on Ni 56wt%-Ti 0.267 mm wire, this investigation explores the fatigue properties at 0.127 mm of the same melt lots.  By employing the same rotary beam fatigue testing, material with equivalent thermo-mechanical processing to achieve like superelastic properties is compared.  With known statistically detectable variations in carbon level and inclusion content, testing again focused on determining if there is a difference in rotary beam fatigue performance.  In contrast to the results of the previous study, there is evidence of a difference in performance for the smaller diameter wire among melt sources.  Possible explanations for this difference and its significance are discussed.