When it comes to measured lines, that's great, but in my experience, unless you have a really secure mounting system, it's a tough test to have confidence in.
If it helps, I had a tangential but relevant project to your question. I have a Steyr AUG, with a 3X scope. Funny thing about Steyr, they never published anywhere, ever, in any way, just what one click of adjustment actually means on their 3X version. If you go to an open-field 3-gun match, and are going to be engaging gongs from 300 to 500 yards, and really know your gun, your ammo, and your scope, you can do that with a standard 200 yard zero. But you really need to know your clicks, to do it.
So, I did the standard 100 yard range, moved it a few clicks over on small piece of paper fired a shot, and saw that it was about 1 MOA difference in impact (ish). And then promptly didn't believe it, as the arrogant Austrians no way are going to put a 1 MOA click adjustment on a Steyr AUG (Aug... aug...
aug). Also, the AUG is a 2+ MOA rifle, so doing a couple shots, has so much error from the shot, that it can be very misleading if not careful.
So, I went back to the range, found the biggest target frame at 100 yards I could find, and just covered it with paper. I then clicked way over to various corners, tracking my clicks, and fired groups. Then I used Range Buddy App, to digitally analyze the groups, and give me center-of group, for 5 shot groups. From this, I averaged distance moved per click, from a broad spectrum of distances and directions, and averaged the results. Final result, 1 click = 1/4 mil, on a 3X Steyr AUG. Then I clicked it back to center.
My suggestion is to do something like that, because not only is it your box test to see how well you return to zero, it's also a great test to determine if your 1/2 MOA clicks (or whatever), truly are. (looking at you Vortex)
Back to my story, I later went to a match just like that, clicked my scope up to 400 yards knowing my ballistics and running an APP on my phone. Then, knowing my ballistics and the sizes of the gongs at the various distances, I was able to confidently and accurately just hold high or hold low, and exactly where, on the edges of the gongs all the way out. Result, one of the fastest scores of the match on that stage; and I did it with an AUG that wasn't even all that accurate. If I tried that thinking 1 click was 1 MOA, I would have been screwed at those distances.
Point is, doing tests of this nature really help you learn your gear, and that can pay off sir!