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# Math question on scope adjustment?

#15
11-28-2009, 09:56 PM
 Bronze Member Join Date: Nov 2009 Posts: 58
Re: Math question on scope adjustment?

So on a 300 RUM with a 20" drop at 500, Dead on at three hundred, 1/4". 83 clicks should put me on right? Theory....
#16
11-29-2009, 09:21 AM
 Gold Member Join Date: Dec 2002 Location: mathias wv Posts: 987
Re: Math question on scope adjustment?

Quote:
 Originally Posted by RFears So on a 300 RUM with a 20" drop at 500, Dead on at three hundred, 1/4". 83 clicks should put me on right? Theory....
Not quite,
MOA (minute of angle) a unit of angular measurement equal to 1/60th of 1 degree or 1.0473" per 100 yards of range

so 1/4 MOA is 1.0473/4=.262"
at 500 yards 1/4 MOA is .262" (1/4 moa)X5 (range in hundreds of yards)=1.31 so each 1/4 MOA click on the scope will move point of impact 1.31" at 500 yards
20"/1.31=15.2 or 15 clicks
RR
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#17
11-29-2009, 09:49 AM
 Gold Member Join Date: Mar 2008 Location: clearfield county , Pa Posts: 892
Re: Math question on scope adjustment?

Quote:
 Originally Posted by WEATHERBY460 Can it happen that you are dead set even left/right at 100, then the further out, you are off one way or the other...what causes that?

here is a very good article that explains how to set up your scope . this could be your problem . Jim

Reticle Perpendicularity
#18
11-29-2009, 01:20 PM
 Bronze Member Join Date: Nov 2009 Posts: 55
Re: Math question on scope adjustment?

As a rule of thumb when getting a rifle/scope combo set for extended ranges, I set my POI to be one inch left to allow for bullet spin from a right hand twist. This is not perfect for all calibers or all rifles but it does keep me in the game.
#19
11-29-2009, 01:56 PM
 Platinum Member Join Date: Feb 2005 Location: USA Posts: 2,598
Re: Math question on scope adjustment?

I believe that your scope adjusts in "Inches Per Hundred Yards" ( IPHY) and not I MOA (Minute Of Angle). 1/8 clicks adjusts the reticle .125 inches per click per hundred yards. A 1/8 MOA click adjusts the reticle .130 inches per hundred yards.

Just think in IPHY instead of MOA and you will have an easier time of it
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#20
11-29-2009, 08:53 PM
 Platinum Member Join Date: Oct 2007 Posts: 1,249
Re: Math question on scope adjustment?

Quote:
 Originally Posted by 4xforfun 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.
Can anyone answer this....are the Leupold adjustments in MOA or inches? It looks like my NF is in MOA. I am pretty sure that the litierature from Leupold says inches, but are they just trying to simplify things? You know...the "they mean the same thing" speach they gave me because they don't think we are smart enough to comprehend the differance.
#21
11-30-2009, 01:37 PM
 Platinum Member Join Date: Jun 2007 Location: Wilmington NC Posts: 4,787
Re: Math question on scope adjustment?

Quote:
 Originally Posted by WEATHERBY460 Can it happen that you are dead set even left/right at 100, then the further out, you are off one way or the other...what causes that?
Yes, your scope is not perfectly perpendicular and you need to read the articles on this site about how to check that and confirm perfect vertical.

BH

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