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Math question on scope adjustment?

#1
11-27-2009, 04:10 PM
 Silver Member Join Date: Oct 2009 Location: ILLINOIS Posts: 277
Math question on scope adjustment?

22-250

I am dead on at 100 yards
My ballistic calculator says at 400yards, come up 4.7 moa or -19.5"

If my scope says 1 click 1/8" how the heck many clicks do I go, and in what direction?

Thanks...i think it is 37.6 clicks in the following the down arrow, but not sure?

Thanks!
#2
11-27-2009, 04:16 PM
 Gold Member Join Date: Aug 2009 Location: On the road again Posts: 509
Re: Math question on scope adjustment?

To be nitpicky, it matters if your clicks are 1/8" or 1/8 MOA. At longer ranges, you'll need more clicks if it's 1/8".

For now we'll assume it's 1/8 MOA for ease of math.

1/8 = 0.125
4.7 MOA / 0.125 MOA per click = 37.6 ~ 38 clicks. So you were right up to this point.

And you want to turn in the UP arrow direction. That will move your POI 4.75" high at 100 yards, and dead on at 400, assuming correct dope.
#3
11-27-2009, 04:23 PM
 Platinum Member Join Date: Jun 2001 Location: Potomac River Posts: 5,048
Re: Math question on scope adjustment?

The arrow points UP for moving the bullet strike UP. For simple memory " Go UP tp go UP".

There are eight 1/8 per inch. You want to move up 4.7 IPHY then that is 4X8 = 32 clicks plus 0.7 IPHY = 6 clicks Total is 32+6 =38

If your scope is set up in inches then you need to toogle the units in your ballistic calculator so it gives you IPHY instead of MOA. Life will be simpler and more accurate
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#4
11-27-2009, 04:27 PM
 Platinum Member Join Date: Mar 2007 Location: MN Posts: 1,218
Re: Math question on scope adjustment?

just to add to what BB said... most scopes in the US are IPHY. Nikon, bushnell, Tasco, redfield, burris...

your upperend and European scopes are usually MOA.
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I used to re-load but now I "hand-load".
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#5
11-27-2009, 04:39 PM
 Gold Member Join Date: Oct 2007 Posts: 746
Re: Math question on scope adjustment?

Funny story,

A few years ago I got all anal about the whole inch/moa thing. I was not real sure about my Leupold scope.....did it move in inches or moa. I called Leupold for the answer. I talked to several people up the food chain and they all said the same thing...."MOA and inches mean the same thing". When I asked them if 30 MOA and 30 inches at 1000 yards is EXACTLY the same....they said....."YES.....EXATLY" !!!!!!

Go figure.

To this day I am not sure. How about NF Scopes.

Last edited by 4xforfun; 11-27-2009 at 05:46 PM..
#6
11-27-2009, 05:15 PM
 Silver Member Join Date: Oct 2009 Location: ILLINOIS Posts: 277
Re: Math question on scope adjustment?

Can I check this at 100 yards by aiming at the bull, and the bullet should hit 19.5" high?
#7
11-27-2009, 05:29 PM
 Gold Member Join Date: Aug 2009 Location: On the road again Posts: 509
Re: Math question on scope adjustment?

Quote:
 Originally Posted by WEATHERBY460 Can I check this at 100 yards by aiming at the bull, and the bullet should hit 19.5" high?
No. It'll be 4.7" high at 100.

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