You need to match your powder to the barrel length for optimum burn. Maximum velocity will always be with the longer barrels up to about 32-34" from have I reminder. Gains of 5-25 fps per inch have been reported but reports vary greatly. In my quest for speed I have learned that speed and accuracy don't always go hand and hand. Don't worry if your not at max velocity with a high BC bullet because they commonly don't shot the best at the highest speeds. You can choose a slightly faster burning powder for shorter barrels and slower powders for longer barrels to get the best speeds from each barrel. Luck, Tim
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