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".. 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."
Can't be done. Speed is much more than simply the pressure peak; it's the average pressure applied over time. We can get as much pressure as any action can withstand by using a small quanity of pistol powder but the pressure pulse would be too brief to accellerate a rifle bullet to any useful speed. Maintaining high average pressure while bullets accelerate down the bore requires a high volume of gas and the laws of physics tells us we can't get more out than we put into the case. If you want more speed, use more powder of a burn rate that can do the job - and there's a practical limit to that too.
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