Patrick
Make sure, before you start filing, that you have decided on the load that the gun and you shoot best! It does you no good to file to a load and then deciding that you want more or less power.
Rules of thumb:
Faster loads shoot lower than slower loads.
Heavier bullets at one velocity, shoot higher than lighter bullets with the same powder charge but at a different velocity (which occurs when bullet weight changes but powder charge is consistent).
A heavy bullet and a light bullet pushed to exactly the same velocity will strike pretty much at the same point of aim.
A lot of people mistakenly believe that slower loads should strike lower. It's not the case, unless the velocity is soooo slow as to render recoil nonexistant.
Also, bench rested loads will not strike to the same point of aim as handheld loads, though properly benching the barrel will make it easier to develop a load and then regulate the sights to bring it to point of aim.
The first thing you have to do, is decide on the load that the gun loves and you love! You have to shoot it enough that you reach the point where you are consistently grouping in the same place all the time, even if that means you are shooting 15 inches lower than point of aim. Once you have reached consistent groups that you are satisfied with, break out the file and go for it. Don't be afraid!
Dan