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Internet myth. Using a faster powder does not improve velocity when using shorter barrels. The load you develop that produces the best velocity from a 26" or longer barrel will also be the fastest load from a 20" or shorter barrel.
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When you are going from a rifle length barrel to a carbine length barrel you are correct.
However these myths get started because there is a grain of truth somewhere.
When you are going from a rifle length barrel such as 24" to a pistol length barrel, such as 10" or less then you might want to rethink that statement that a slow burning rifle powder will produce faster velocities than a pistol powder. Just because 2400 gave you the best velocity in a long barreled levergun for your 44 doesn't mean it will be the best performer out of your 2" snubbie.
Jimro