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Dialing For Distance

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  #1  
Unread 03-22-2012, 09:54 PM
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Join Date: Jan 2012
Posts: 60
Dialing For Distance

Ok,

In the past I've always used cheap scope for hunting and shooting. I'd zero them for point blank range and then just use hold overs. This has worked out well out to 300 yards or so.

Recently I bought a Viper Vortex. It has 1/4 MOA adjustments. I've never really dailed for distance before and I am a little confused. Since my scope is 1/4 MOA, I assumed that it was 1/4 inch at 100, 1/2 inch at 200, 1 inch at 400 etc .....

But, when I run my velocities for my ammo through JBM, it gives me way different numbers.

For drop in inches at 100, 200, 300 and 400 it says .....

0.0

4.3

15.8

35.9

For drop in MOA it says .......

0.0

2.1

5.0

8.6


Shouldn't these two sets of numbers be the same??

I hope someone can clear this up for me.
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  •   #2  
    Unread 03-22-2012, 10:03 PM
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    Join Date: Jan 2012
    Location: Hot Springs, South Dakota
    Posts: 530
    Re: Dialing For Distance

    What is Minute of Angle

    Hopefully, this helps.

    But, your above numbers are about right.
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      #3  
    Unread 03-22-2012, 10:44 PM
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    Join Date: Dec 2009
    Location: NW MT
    Posts: 3,075
    Re: Dialing For Distance

    it gave you the drop in inches and the moa correction. 1moa=4[1/4] on your scope4.3''= 2.1x2,for 200yrd.35.9'' =8.6x4 for 400 yrd drop.that should be more like 8.9
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      #4  
    Unread 03-23-2012, 05:41 AM
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    Join Date: Jan 2008
    Location: Northeast
    Posts: 3,404
    Re: Dialing For Distance

    The numbers your calculator gave you are correct. One MOA is not equal to one inch, it is equal to 1.047". For example, your 300 yard value:

    15.8"/3= 5.27, 5.27"/1.047=5MOA. This is correct.
    __________________

    "Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt
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      #5  
    Unread 03-23-2012, 10:40 AM
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    Join Date: Dec 2009
    Location: NW MT
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    Re: Dialing For Distance

    Can tell Ive been shooting mil for a while
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      #6  
    Unread 03-23-2012, 10:48 AM
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    Join Date: Mar 2008
    Location: SW Idaho
    Posts: 1,315
    Re: Dialing For Distance

    1 MOA is 1.047 of an inch so each click of a true MOA scope should be .26 of an inch. But your scope may or may not perform to those specs. Be sure to check your turrets to see how they perform. This isn't necessary for close range work but will be as you start to push the distance.

    Your general statement about MOA clicks growing at distance is correct. But the ballistic calculator is telling you how many MOA you need to adjust, not how many clicks. 4 clicks = 1 MOA.

    Do a search from the Google search button at the top of this page. There are a lot of good threads going into detail about this.

    HTH,

    Scot E.
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      #7  
    Unread 03-23-2012, 08:23 PM
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    Join Date: Jan 2012
    Posts: 60
    Re: Dialing For Distance

    I get it. I don't know what the hell I have been thinking. No wonder I got lost in my scope when I was at the range. Had to go back to zero at 100 yards and then work it out again to get on at 545 yards. I was thinking each click was 1/4 inch and so one. Not so. I did manage to take the info and make a drop chart for my rifle using clicks. I just multiplied the MOA measurements by four and went with that.
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