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# Help with math

#1
02-09-2012, 04:00 PM
 Junior Member Join Date: Feb 2012 Posts: 4
Help with math

Ok i'm just starting out and i use a .308 with a 21 inch barrel. I want to be able to make 500 plus yard shots but 500 will do for now. I was wondering how to do the appropriate math for figureing out how to adjust my scope to hit my mark. My scope is 4-16x40mm and has 1/4" MOA at 100 yards. I plan to use federal 168gr. match ammo.
I was told to calculate the adjustment for the drop was for ex. if my bullet drops 63.3" @ 500 to figure the adjustment to do this.
63.3/1.047=60.458/5=12.091 MOA is this correct? I need help. I would love for now to be able to make a 500 yard to a 600 yard shot . please help and thanks.
#2
02-09-2012, 04:20 PM
 Platinum Member Join Date: Mar 2008 Location: SW Idaho Posts: 1,141
Re: Help with math

There is a free Ballistic calculator on this site that is fantastic for learning what you are after and much, much more. Get to know it, it will be one of the best things you can do to develop a solid base of external ballistics.

Long Range Hunting Ballistics Calculator

If you are just trying to figure out the math of it all then you are on the right track. I personally would just use 1 inch per MOA to start because that is really easy and until you verify that your specific turrets actually track at exactly 1.047 MOA then you are really just guessing anyway. Plus out to 500 yards the difference between 1.047 and 1 is nil in the grand scheme of hunting or shooting.

HTH,

Scot E.

PS. Welcome to LRH!
#3
02-09-2012, 05:41 PM
 Junior Member Join Date: Feb 2012 Posts: 4
Re: Help with math

Thanks . How do I figure my adjustments for wind, spin drift, and the coriolis effect. I'm positive I'm not gonna need to know the coriolis effect because i'm not gonna shoot that far anytime soon. If theres anything else I need to know to pull a 500 yard shot of please share. I'm eager to learn the correct way so I can shoot properly and safely
#4
02-09-2012, 05:56 PM
 Platinum Member Join Date: Mar 2008 Location: SW Idaho Posts: 1,141
Re: Help with math

Ignore Coriolis and spin drift for the distances you mentioned. The program will give you outputs in MOA then you just dial in the appropriate amount.

4 clicks equals 1 MOA on your turret.

Scot E.
#5
02-09-2012, 07:55 PM
 Gold Member Join Date: Jan 2003 Location: North Louisiana Posts: 503
Re: Help with math

It's pretty simple to divide 63 by 5!!
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#6
02-09-2012, 10:40 PM
 Platinum Member Join Date: Jan 2003 Location: The rifle range, or archery range or behind the computer in Alaska Posts: 3,267
Re: Help with math

.25 MOA per click = .26175

63.3" / (.26175 * (500/100)) = 48 clicks or 12 MOA.

In other words you are on the right track. You are definately doing it right by taking into concideration the difference between 1 MOA and 1" at 100 yards. At 500 yards it is of little concern. at 1000 yards its the difference between a hit and a miss. Always factor the 1.047 part into the equation.
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#7
02-10-2012, 01:58 PM
 Gold Member Join Date: Jan 2003 Location: North Louisiana Posts: 503
Re: Help with math

DON'T TAKE IT FOR GRANTED....that whatever scope you're using is giving the amount of movement that the maker states!
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United States Marines: Giving the enemies of America a chance to die for their cause since 1775!

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