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#7097450 - 11/21/12 10:29 AM Question about ballistics chart
wes7x57 Offline
Campfire Regular

Registered: 12/01/04
Posts: 998
Loc: Jasper, AL
I copied this chart from JBM and had a question. Sorry, I couldn't make it any larger.
With a 100 yard zero. How many clicks would I click up to hit at 450 yards? Assuming 1 click is 1/4" at 100 yards.Please provide the math also.
Thanks



Edited by wes7x57 (11/21/12 10:33 AM)
Edit Reason: added info
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#7097472 - 11/21/12 10:38 AM Re: Question about ballistics chart [Re: wes7x57]
mathman Offline
Campfire Kahuna

Registered: 06/03/04
Posts: 19418
40.4 inches of drop at 450

1/4" click at 100 yards corresponds to 4.5 * .25 = 1.125" click at 450 yards

40.4" / (1.125" per click) = 35.91 --> use 36 clicks

If your clicks are really 1/4 MOA then you'd use 8.6 MOA drop divided by 1/4 MOA per click = 34.4 clicks --> 34 or 35 clicks

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#7097493 - 11/21/12 10:46 AM Re: Question about ballistics chart [Re: mathman]
wes7x57 Offline
Campfire Regular

Registered: 12/01/04
Posts: 998
Loc: Jasper, AL
Thanks!!
It's a Zeiss Conquest 3-9x40 and is marked 1/4" at 100 yards.

600 yards would be 58.2 clicks??
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#7097496 - 11/21/12 10:47 AM Re: Question about ballistics chart [Re: wes7x57]
mathman Offline
Campfire Kahuna

Registered: 06/03/04
Posts: 19418
Looks right.

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#7097509 - 11/21/12 10:52 AM Re: Question about ballistics chart [Re: mathman]
wes7x57 Offline
Campfire Regular

Registered: 12/01/04
Posts: 998
Loc: Jasper, AL
Thank you sir!!
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#7097527 - 11/21/12 11:01 AM Re: Question about ballistics chart [Re: wes7x57]
mathman Offline
Campfire Kahuna

Registered: 06/03/04
Posts: 19418
Just a note: Since that's not a parallax adjustable scope, make sure you're well centered in the sight picture when you zero at 100 and when you go long. Not just consistently positioned shot to shot, but consistently centered.

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#7097530 - 11/21/12 11:04 AM Re: Question about ballistics chart [Re: mathman]
wes7x57 Offline
Campfire Regular

Registered: 12/01/04
Posts: 998
Loc: Jasper, AL
Good to know. I plan to zero at 200. Would that be better?
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Take your kids hunting, instead of hunting your kids.

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#7097532 - 11/21/12 11:06 AM Re: Question about ballistics chart [Re: wes7x57]
wes7x57 Offline
Campfire Regular

Registered: 12/01/04
Posts: 998
Loc: Jasper, AL
BTW, I'm not looking to start shooting animals at long range anytime soon. Just trying to get the concept figured out.
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Take your kids hunting, instead of hunting your kids.

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#7097542 - 11/21/12 11:09 AM Re: Question about ballistics chart [Re: wes7x57]
mathman Offline
Campfire Kahuna

Registered: 06/03/04
Posts: 19418
Originally Posted By: wes7x57
Good to know. I plan to zero at 200. Would that be better?


The same principle applies.

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#7097748 - 11/21/12 12:35 PM Re: Question about ballistics chart [Re: mathman]
greentimber Offline
Campfire Ranger

Registered: 08/03/08
Posts: 1768
Loc: TN
Best thing to do is eliminate inches and clicks from your vocabulary now. Your scope adjusts in IPHY or "inches per hundred yards"

Jbm will output data in IPHY. Re-run your numbers in IPHY. When you adjust your scope, count 1-2-3-One, 1-2-3-Two, 1-2-3-Three, etc. trying to count to 36 or 48, or 162 gets increasingly difficult and is inferior in any regard. Think and operate in relevant units which are IPHY for your scope.
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