P-T Expansion has two modes of operation. Both modes calculate and display the Muzzle Velocity, Muzzle Action Time, tabular, formatted and plot results. The modes are:

• Baseline
• Velocity and Action Time Matching

For the Baseline run the program uses the nominal values for the four matching parameters:

• Resistance Pressure Factor
• Base Pressure Factor
• Chamber Pressure Factor
• Chamber Pressure Offset

which the user inputs. This is a good way to double check the basic program inputs and to see how close the results are to the test data before doing an iterative "Velocity and Action Time Matching".

The "Velocity and Action Time Matching" varies the four parameters above within minimum and maximum limits which the user sets. The program then presents the same types of results as the Baseline run along with the four matching parameters that it used to get those results.

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