Why do longer barrels mean faster bullets, if the pressure decreases the longer the bullet stays in the barrel?
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As long as there is still enough energy to accelerate the bullet appreciably, the additional length is still adding velocity. There is a point where the gasses’ expansion slows enough that it’s no longer applying any force to the bullet, but that happens significantly after the peak force.
Think about it like flooring your car from a stop, you can slowly let off the pedal but still be accelerating for a lot of that range, it’s not a straight max or off arrangement.
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