[skeet]

Quoting(all else being equal that a longer barrel will produce faster velocities than a shorter barrel) . That assumption is correct all else being EQUAL.. longer will trump a shorter one every time.. But remember..different powders even with bbl lengths can make a big difference. Everything you change will make a difference. Seating depth the leade in the chamber the case the primer the bullet itself. All that being said..Sometimes many things will not make a big difference. Primers is one thing that quite often make little difference..as long as you use a standard primer for a standard. Other times it can make a much bigger difference. Handguns and magnum primers can make a BIG difference between loads. And then sometimes you have to use a mag primer..many factors make either small or large differences. That is why we call it load development I guess.