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I will ask in a simpler way. Would it be possible to push a 168gr 30 caliber bullet at say 2700-3000 FPS from a case as small as 300BLK if there was a powder that would produce the pressure without the barrel blowing up?
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Theoretically this could be done, but probably not with actual gunpowder. The military has dabbled with using high explosive as a propellant and velocities as high as 20,000 fps have been achieved in comparison, smokeless powder's absolute maximum is around 6,000 fps and I know of no cartridge achieving more than 4,800 or so. Such a propellant, with so much more energy potential than smokeless powder, could be used to give something like a Blackout extremely high velocities, if properly formulated, and if pressure issues could be overcome. And of course, the cost issue.
Just a small disclaimer: If you pack a cartridge case full of C4 and set it off I am not liable
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