Under the Rotating Band Parameters, you should enter a "Mickey's Constant" that is appropriate for the band material used on your projectile. "Mickey's Constant" does not affect engraving forces, but it does influence the wear experienced by the rotating band during the trip down the barrel. The "Mickey's Constant" is a number, used as an exponent, related to the melt temperature of the rotating band material. It is used to compute rotating band wear as a function of travel in the barrel. By holding your cursor on the bottom edge the Mickey's Constant input block, as shown, a hidden "pop-up" box will be displayed listing the appropriate Mickey's Constant for various rotating band materials. If the band material for your projectile isn't listed in the "pop-up" box, you will want to estimate it based on a comparison of melt temperatures. When you click on the Band/Resistance Profile tab, you will see the Band/Resistance Profile input parameters as shown in the figure below:

Since this projectile uses a Nylon rotating band, a Mickey's Constant of 15.2 should be entered. Once this is done, the resistance pressure vs. travel is computed by clicking on the ReCalculate Resistance Profile button. This is shown in the following figure. Note by moving your cursor over the lower left corner of the Mickey's Constant input box, the options are displayed.

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