JawnHenry,

One of the oldest myths in handloading is that shorter barrels will get higher velocities with faster powders.
In reality, the same powders that get the highest velocities in longer barrels get the highest velocities in shorter barrels. In fact the last velocity loss in short barrels comes with a combination of slow powders and heavier bullets.

I'm too tired right now to explain AGAIN why this is so, but it is.

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