For those who are looking to do ctc measurement of group shooting, in case it hasn't been mentioned, I'll pass on a method most BR shooters use.
Use the cross hairs to align a solid black square so that the bisecting point of the hairs are located at one of the four corners keeping an even window of light twixt the hairs, the side and the bottom or top (depending on which corner you're aligned with).
If this is a bit murky so far, think of looking thru your scope and placing a black box just outside of the hairs leaving a sliver of light between the two sides that are closest to the cross hairs. This is very effective as the human eye can differentiate quite small differences in light...........to wit, the globe front sights with different hole diameters on iron sighted target rifles. Your eye just wants to put that round black dot in the middle of the hole......
Destroying your aiming point will be detrimental to group size.....adjust the scope to keep the group outside of the target. As a bonus, you'll better be able to observe the poi in relation to what you thought the wind was doing when it broke. It can be really gratifying to dope the wind and plop a round into the center of the existing group. If that would only happen more often, eh? Shots in the black can be difficult to see at times.
As far as aligning the hairs to cover the vert & horizontal lines of a target, depending on cross hair size, there will be a discrepancy as to whether you are wandering around within the printed lines (cross hairs would be smaller) or covering the lines, blotting them out and not knowing where they are when the hairs are thicker than the printed lines.
Yes, this may be miniscule, but that is exactly what group shooting is.......gathering every .010" you can get your hands on. Then when you get the last .010 set your sights on the remaining .001's.
