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# Math question on scope adjustment?

#8
11-27-2009, 06:24 PM
 Silver Member Join Date: Oct 2009 Location: ILLINOIS Posts: 277
Re: Math question on scope adjustment?

ohhhhhhhhhhhhhhh

its beginning to click now...lol
#9
11-27-2009, 06:34 PM
 Silver Member Join Date: Oct 2009 Location: ILLINOIS Posts: 277
Re: Math question on scope adjustment?

I shot, and am about 8" high at 400 yards....so that means I need to move the scope in the "down arrow" direction........am I right?

i am bad a my left/rights/up/downs...lol
#10
11-27-2009, 06:39 PM
 Platinum Member Join Date: Nov 2003 Location: Washington State Posts: 2,412
Re: Math question on scope adjustment?

4.7 MOA at 100yds is approx. 4.7 inches, or to be more exact, multiply 4.7 by 1.0471996 to = 4.92 inches at 100 yards. 4.7 MOA at 400 yds is approx. 19.69 inches.

1 MOA converted to inches at 100yds is 1.0471996 inches, or just 1 inch to make it easy, but 1 MOA at 400yds would be 4 x 1.0471996 inches. That's how I got the ~19.69 inches above.

Take the yardage to target, divide it by 100 and that is what 1 MOA at that yardage will be in inches. That's close enough for estimated MOA typically.

1000yds-1MOA is 10" To be more exact-- multiply 10 by 1.0471996.

600yds-1MOA is 6"

200yds-1MOA is 2"

559 yds-1MOA is 5.59"

...etc.

Sorry if that's not helpful. Jon
__________________
In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

#11
11-27-2009, 06:40 PM
 Platinum Member Join Date: Nov 2003 Location: Washington State Posts: 2,412
Re: Math question on scope adjustment?

Quote:
 Originally Posted by WEATHERBY460 I shot, and am about 8" high at 400 yards....so that means I need to move the scope in the "down arrow" direction........am I right? i am bad a my left/rights/up/downs...lol
Yes. 2 MOA down should get you very close if your shooting ability and equipment and ammo are all working very consistently. But again, if you don't know what units your scope is adjusting in, you need to find out and then start using those units in your ballistics program and start thinking in those units, whatever they may be.
__________________
In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

#12
11-28-2009, 02:10 AM
 Silver Member Join Date: Oct 2009 Location: ILLINOIS Posts: 277
Re: Math question on scope adjustment?

I actually shot a 1" 3 shot group somehow at 400yds....but i have also shot basically a 1 hole 5 shot at 100 group...so the gun and ammo are working.

I was a little off to the right also, but next time I shoot I will use a level to make sure I am holding square.

I want to get the height right, then tweak everything else.

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?
#13
11-28-2009, 10:40 AM
 Platinum Member Join Date: Nov 2003 Location: Washington State Posts: 2,412
Re: Math question on scope adjustment?

"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?"

Wind, spin drift, coriolis potentially. Might want to check out Bryan Litz's new book:

New Book: "Applied Ballistics for Long Range Shooting"

And perhaps pick up a copy of Carlock's first video:

Long Range Hunting DVD

Some of this will start making alot more sense after going through these resources.
__________________
In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

#14
11-28-2009, 04:07 PM
 Silver Member Join Date: Oct 2009 Location: ILLINOIS Posts: 277
Re: Math question on scope adjustment?

Im good.....as far as left rights...just need a couple clicks to fix that. i shot pretty good today with the calm wind. actually really good.

I seem to be 31 clicks (1/8 per click) between 0@100 and 0@400 . I chronoed this 50 grain bullet at only 3600fps. Little slow, but it shoots super for me.

I am going to menards to buy some wood to make a better target at 400 yards.

I am surprised at the ballistic charts of how much bullets drop from 400-500 yards.

Thanks for the help!

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