I'll tell you why I put it that way. I've seen more than once guys ask similar questions, and then use the info without ever shooting the range they asked about.
Nobody could give an accurate answer to him. All they could do is give their best guess. I don't think guessing should be involved in sighting in a gun.
The best answer I could give him was to shoot at 100yds. Which he claims he was going to do anyway. Then why bother to ask the question. It wasn't going to be off more than a couple of inches.
I gave an honest answer to him. He didn't like honesty.