Nothing is going to change. In the real world that is. When you push a 150 grain bullet that’s 35 caliber with 15,000 more psi than another 35 caliber 150 grain, it’s going to go faster.
I’m also aware your little trying to fit in thing you got going in this cyber world isn’t going to change either. You win the internet, and I know how ballistics work when I’m not reading asinine it’s the same thing posts.
If you take a car and run full speed into it with your body it is giving it a lot of pressure in a short time. It may even “surge” the car briefly. But if you take the same energy and push over 10 seconds then the car is going to go farther. Has the amount of energy changed? One had more pressure and went a shorter distance.
Using that analogy, you are correct that if the same powder was used and more of the same powder was used it would create more pressure and more velocity. But you can use a slower burning powder and create a longer “push” and the bullet gets a slower acceleration but a higher peak speed than if you have it a quick short burst of energy and higher pressure.