The correct spelling is Velocity. ( not trying to make you feel bad or anything)
Usually a longer barrel will generate more velocity. As the pressure builds ( once you have pulled the trigger) the pressure builds just a bit longer in longer barrels, therefore generating just a bit more velocity. Now sometimes it won't be much, depending on the caliber, bullet weight and powder charge it could be as little as 20 feet per second, up to maybe 100 feet per second. So many factors play into it, it is sometimes hard to factor.
Usually a longer barrel will generate more velocity. As the pressure builds ( once you have pulled the trigger) the pressure builds just a bit longer in longer barrels, therefore generating just a bit more velocity. Now sometimes it won't be much, depending on the caliber, bullet weight and powder charge it could be as little as 20 feet per second, up to maybe 100 feet per second. So many factors play into it, it is sometimes hard to factor.