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Thanks for all the replies, but what if you could get a special powder that would produce the same pressure in a smaller case that would push a bullet faster than in a larger case.
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You pretty much already ARE producing the same pressure in a smaller case. The problem is that you run out of powder quicker because there is less of it to burn. Because you run out of power more quickly, the area under the pressure curve is less and that means the total amount of force applied to the bullet before it leaves the bore will be less. That means lower muzzle velocity.
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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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The problem is that there is a practical limit to how much pressure the system (case & gun) will tolerate. If there weren't any limits on the pressure, then you could do a lot of things that are currently impossible.
Questions with an "if" in them are problematic when the "if" is followed by something that's not possible.