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Old December 30, 2012, 07:23 AM   #28
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Join Date: December 23, 2005
Location: Minnesota
Posts: 2,850
Peak pressure occurs when an accelerating rifle bullet has gone maybe three inches or so. Therefore, we need not be concerned about choosing a different burn rate by barrel length; whatever powder produces the highest speed in a 36" barrel will do so in a barrel half that length.

The powder that gives you the highest velocity in a short barrel will give the highest velocity in a long barrel as the powder is all burned up in the first few inches of the bore.

The muzzle flash is gas produced by the "burned" powder igniting when exiting the barrel and entering an oxygen rich atmosphere.
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