Zero range

Thanks for the feed back. Right now I’m on at 25 yards and have a range card out to 90 yards taped to the back of my scope cap. This works ok but at some ranges the hold over is let’s say 2.7 mills. I was wondering if it was possible to find a zero distance that would aline more with 1 or 1.5 dots on my scope. At 80’yards having a 1.8 holdover is harder to do then say a 2 or a 1.5. More then likely just wish full thinking. 
 
Thanks for the feed back. Right now I’m on at 25 yards and have a range card out to 90 yards taped to the back of my scope cap. This works ok but at some ranges the hold over is let’s say 2.7 mills. I was wondering if it was possible to find a zero distance that would aline more with 1 or 1.5 dots on my scope. At 80’yards having a 1.8 holdover is harder to do then say a 2 or a 1.5. More then likely just wish full thinking.

This is all dependent on the velocity of the projectile you are shooting, weight, bc, bore to scope distance, etc. 

I had a great article that I linked last year on how to calculate your first and second zero dependent on the information above with great graphics after you input the data. I've searched my bookmarks, but darned if I can find it. I'll keep looking and link it if I come across it. You could also google 'first zero second zero'. Anyway, if you shoot AR's it's along the lines of setting a 50/200 zero on a battle rifle. At your first zero, 50, the projectile is accelerating and climbing as it crosses the visual plane of the scope (straight line of sight). It then starts to feel the effects of gravity and breaks the second plane of the scope at 200. Regardless of the velocity of the cartridge/pellet you are shooting, we are all shooting glorified howitzers. It's alway an arc. 
 
I am sure you probably already chose a zero by now but "Chairgun Pro" app on your phone or computer once data is input will tell you "optimum zero". In all honestly I have entered tons of rifles and such and 30 yards or so seems to be the best bet in most air rifles between .177 and .25 caliber. 30 would be much better than a 15 yard zero ill tell you that from experience even if you only plan to shoot 40! Good luck!