Velocity, Kinetic Energy, and Pressure Deviations Resulting from the Adaptation of a Secondary Propellant Chamber on a 30-06 Rifle Barrel.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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A secondary chamber was adapted to a 30-06 pressure barrel as a means for increasing muzzle velocity without exceeding the barrel pressure rating. Ignition of the secondary charge was accomplished by the high pressure gases behind the bullet. Resulting muzzle velocities were determined for various amounts of three granular and one liquid propellant. Pressure-time curves were obtained for one of the faster burning powders. Adiabatic bomb calorimeter testing and published data were used to determine the heats of combustion. The data suggested that the rate of energy release, and not the heat of combustion, was the dominant factor. The results also indicated that a more optimum location of the secondary charge was possible. Modified author abstract