Originally Posted by loaders_loft
hash marks are pretty inconsequential. Just look through the scope while turning the side focus or the AO on the front bell until its as clear and sharp as possible. It can help to focus all the way out to infinity first, then work back until its clear. If there is no clear adjustment, its probably mirage, so you can go down in magnification to minimize the mirage effect...
Yes, that is how I do it, but there is a wide range on the dial wherein the target is in focus, and if the setting actually affects POI, then it must be the same setting when I return to that distance. So focus alone may not be precise enough. I typically focus near to far and stick with the "nearest" setting for a given distance but not always. Now that's something I'll have to keep track of.
I'm gonna run some tests this week on a a200 yard target, setting the paralax/focus from nearest point on the dial where the image is sharp and shooting a few, then changing to the farthest point where its in focus and shooting a few.
This may explain why I have experienced some "displaced" but reasonably tight groups. (Where a < 1" 5 shot group @ 200 was 2" higher than it should have been. I've been thinking its the tailwind currents at the range, riding up over the 100 yard berm and actually lifting the bullets. I've been calling them "magic bullets" - ones that show no drop between 100 and 200 yards.)