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I just thought of an example to illustrate the difference between fast and slow powders.
If you put a baseball on a tee and punch it as hard as you can (fast peak pressure), how far will it fly? Maybe 40 or 50 feet.
But if you throw the ball as hard as you can (slow peak pressure), it will fly several hundred feet. The longer interval the ball is gaining momentum in your hand results in more energy imparted to the ball and greater velocity.
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