What pills are you going to use and how fast do you want them going? 303 isn't particularly fast to begin with. 16inch barrels have always been a good compromise between length and velocity. 2206h would be a good powder.
What pills are you going to use and how fast do you want them going? 303 isn't particularly fast to begin with. 16inch barrels have always been a good compromise between length and velocity. 2206h would be a good powder.
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