You have never sighted in at 50 yards and then had to fine tune your adjustments at 100? That is pretty impressive, or your not that concerned with precsion. I actually shoot at vertical and horzontal lines when I fine tune my sight.
And I was not putting words in your mouth, only stating the way it comes off. Sorry if you thought that. And I believe it was stated as a question, not as a quote from you. The way it reads is that at 50 yards there is no reason to check it or adjust it if it is wrong at 100. If you sight in at 50 and it's off at 100 I bet most are going to adjust it so it is right. Wouldn't that be sighting in at 100 yards? I guess you could take the measurements at 100 and then make the adjustment and shoot at 50, but why? Just make the adjustments and fire another group to see what happens. Then shoot at 50 again to verify the elevation at that distance. I would agree that if you didn't shoot groups well enough at 100 yards you would be better off doing it at 50. However if that is the case I don't think you should be shooting at 100 yards so you might as sight in dead on at 50. Why would you shoot at game beyond a range you can shoot well at?
I also did not read all the material you did, only what you copy and pasted, so that is what I commented on. I can't comment on something I didn't read. Although according to that theory the guy should have shot good groups, just impacting in a different spot is all.
I have yet to be able to duplicate the things you describe or talk about, so I just find them hard to believe. I have tried the things you have stated and I don't see the same results.
I know you think I don't seem to be getting what you say. I do, I just don't believe it is all. And believe me I am not the only one. The others just don't want to mess with arguing the point. Although I am getting tired of it, so I will probably let it go after this post. Until it comes up again

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Paul