I am trying to find the formula used to figure out how many FPS (feet per second) every inch of a barrel gives you? Say if i went from a 5" pistol barrel to a 16" rifle barrel? I don't have a chronograph yet
All else being the same, the rule of thumb is 25 fps/inch.
However, that is for rifle powders. Fast burn rate pistol powders probably won't give you the same results.
Thanks guys! I called technical support at hodgon and he told me with 9mm i would get an extra 100-200 fps....I will just have to order a chrony and get back with ya! Thanks again!