Roundball gave excellent advice... i.e., "make haste SLOWLY" and I totally agree.
To move the ball's impact to the LEFT, move the REAR sight to the LEFT. If moving the FRONT sight, then move the front sight to the RIGHT in order to move the ball's impact to the LEFT.
I recommend you change ONLY one item at a time... I.E., either adjust deflection (left or right) or elevation (filing the front sight down).
First, I'd move the rear sight to the LEFT a little (a "little" changes a LOT) and shoot at LEAST three 3-shot groups off the bench-rest. If further adjustment is needed, ONLY THEN would I make any further deflection adjustment left or right by moving the REAR SIGHT in the direction I wanted the rifle ball's impact to move.
Once you have your groups "centered", THEN begin filing down your front sight ONLY a TINY amount at a time since you can not put metal back on the front sight once you've filed it off.
After EACH time you filed the front sight down, I'd shoot at least three more 3 to 5 shot groups to get a TRUE picture of what effect the latest filing of the front sight has had on the elevation of the ball's impact.
Besides filing the front sight down, another way to move the ball's impact (vertically) is to change where you "hold" the front sight in the rear sight's "notch".
By raising the front sight's position from where you previously held it in the rear sight's "notch", you gain elevation. However, this method is more difficult to "repeat" shot-after-shot, so filing down the front sight is the PREFERRED method.
JUST DON'T GO TOO FAR and file more metal off of the front sight than is absolutely necessary.
If your barrel is new, then before doing ANY filing of the front sight, I'd recommend you shoot at least 200 to 300 rifle balls through the barrel BEFORE filing down the front sight. Naturally, you can "adjust" the rear sight NOW because it is moveable and you can move it again (if necessary) once the barrel is "broken-in".
Good luck, my friend... and make GOOD smoke ! :thumbsup:
Strength & Honor...
Ron T.