Lead me to water then... Its not about the cartridge is it? The cartridge is a constant. Its about the powder in the cartridge...
Pressure, duration and acceleration all have some bearing on velocity, to suggest that there is no variation to relative performance, by vastly different powder specifications in different barrel lengths seems unlikely from a physics perspective. It may be insignificant or minor but none??.... wheres the direct evidence that can show us those results..?
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