In this research paper, empirical relation between burn rate and pressure index of spherical gun propellant was carried out in the closed bomb. This is double base propellant and used in power cartridge to destroy the suspicious unattended objects. The novelty in this research is that, the author proposed a novel empirical relation among force constant, burning rate coefficient, pressure index and peak pressure. Ballistics properties like burning rate of propellant is depend upon on its shape and size (configuration), chemical composition, temperature, loading density and pressure. The major outcome of this research study has direct relevance for the performance prediction of propellant in the form of powder related to dynamic firings. The peak pressure of the propellant is 235.04 MPa, the rise time 1.95 ms, burn rate coefficient 0.073, pressure index 1.29, flame temperature 2680 ～0K and force constant 953.2 J/g were obtained during experiment. The burning rate for the spherical gun propellant is experimentally expressed as r= 0.073 × 235.04~(1.29)
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