what float pilot has said is likely correct. to make sure before you start tweaking the optic, crank on some more elevation before to make sure the line continues in the same angle of departure as the 200 yard group did.
so far the only way to correctly align the vertical reticle with the bore is the military method. if other means would work, they would have no problem buying the tool capable of doing so, cost no object. to make any offerings of that nature work, absolute alignment would need to be obtained between bbl bore center line and scope vertical reticle. the reticle will not usually/always be plumb/perpendicular with scope knobs, caps or machined surfaces on the adjustment turret body.
draw a vertical line on your target, heavy enough to be seen by your optic with a good 3 foot carpenter's level at 200 yards. use a framing square for the horizontal line, or find a carpenter's level that has both vials agreeing with themselves. (good luck, there) .
to make sure the level is good, check the level against itself by turning it 180 degrees and replacing it in THE SAME PLACE IT WAS, on a fixed object. (read: wall) on multiple vial levels, mark the bubble to make sure you use the same bubble both times. if the level is true, it will read the same both directions. if not centered both times, but the same distance from the bubble vial center, the wall is not level, don't worry.
the framing square can be tested against itself in much the same way.
holding the vertical reticle parallel to the line you have drawn on the target, fire three. crank up on elevation enough to produce a distinctly separate group from first. see if the next group centers on vertical drawn line. when it will the scope vertical reticle is centered on bbl bore centerline.
if it doesn't line up, take my word for it, turn the scope the opposite direction of how it seems it should be turned to correct alignment.
gunnie
