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When things don't compute

 
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  #1  
Old 03-08-2013, 09:23 PM
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Join Date: Mar 2011
Location: Tennessee
Posts: 247
When things don't compute

My load, according to my chronograph with 162 A-max is 2900fps. That is fine and what it should be with my load but. With a 200 yd zero, The drop chart said to come up 7moa for 500 yards and that is low. Have to come up to 8.25 moa to hit center. To get a drop chart to works at 500, the fps has to be 2700 with a 8.25 moa. Why does it not compute right at 2900fps?
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  #2  
Old 03-08-2013, 09:34 PM
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Join Date: Jan 2009
Location: Centre County, Pa
Posts: 214
Re: When things don't compute

That is the reason behind doing range varification!! The chrono graph is a good way to get an idea of the speed your bullet is traveling, but in most instances will not matchup in the field and will need to be tweaked up or down to match your drops. If one was to chrono there perticular load then just go hunting for instance you might be fine for the first couple hundred yards but the further out you went the further off target you would be and get very frustrated!! Now that you have your corrected velocity to match up with your 500 yard drops, go out and test it a little further out and see where you are at should be very close. Hope this helps!
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  #3  
Old 03-08-2013, 09:41 PM
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Join Date: Apr 2010
Location: ND
Posts: 230
Re: When things don't compute

And you should check the elevation clicks to make sure they are what they are supposed to be.
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  #4  
Old 03-08-2013, 10:17 PM
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Join Date: Feb 2013
Location: Central MT
Posts: 756
Re: When things don't compute

Only trust your cronograph and click value so much until you have verified their accuracy. You're on the right track. Practice your drop chart or computed should hit to did hit data at various ranges and adjust your charts/programs to as closely as possible to where they match the actual drop.
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  #5  
Old 03-08-2013, 10:24 PM
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Join Date: Aug 2008
Location: east central fl. /n.c. pa.
Posts: 658
Re: When things don't compute

sorta like those gas milage stickers on car windows.
they lie also.
trust what you see not what youve been told.
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  #6  
Old 03-08-2013, 10:51 PM
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Join Date: Mar 2013
Location: Casper
Posts: 54
Re: When things don't compute

Some of that deviation could be attributed to a variation in the bullets BC, could it not?
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  #7  
Old 03-08-2013, 10:59 PM
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Join Date: Sep 2005
Location: Central AZ
Posts: 941
Re: When things don't compute

Exactly my thought. What bullet are you shooting?
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