Has it been confirmed that the steel is different as well? One member mentioned that the magnum cylinder use a higher chromium and nickel content, which makes sense if they're looking for a stronger cylinder. This also confirms the need for a different heat treat.

If its the same steel as the .38 Specials, then it wouldn't make sense to run two separate caliber specific heat treatments. Just batch treat them all to the same point and move on.

If anyone has specific information on the steels used in these cylinders, please let me know.