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Old February 3, 2013, 09:31 AM   #7
Mike Irwin
Join Date: April 13, 2000
Location: Northern Virginia
Posts: 39,177
A lot of it can be the result of the pressure curve.

Black powder burns at a constant rate, and rather quickly. All of its push is done early in the bullet's travel down the barrel.

Smokeless powder, however, being progressive burning, has a much longer burn time, and depending on the initial chamber pressure, much different burn characteristics.

Smokeless powder will have a much longer pressure curve, meaning that it will keep pushing on the bullet for a much longer time.
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