Abstract: Earlier validations of a higher-order Godunov code for modeling the performance of two-stage light gas guns are reviewed. These validation comparisons were made between code predictions and experimental data from the NASA Ames 1.5″ and 0.28″ guns and covered muzzle velocities of 6.5 to 7.2 km/s. In the present report, five more series of code validation comparisons involving experimental data from the Ames 0.22″ (1.28″ pump tube diameter), 0.28″, 0.50″, 1.00″ and 1.50″ guns are presented. The…