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Figuring Drop based on "Come Ups"?

#22
11-20-2008, 02:07 PM
 Silver Member Join Date: Jan 2008 Location: Elko, NV Posts: 461
Re: Figuring Drop based on "Come Ups"?

Longshot38,

If you and your gun can shoot .5 MOA, and you are off nearly 1 MOA on your drop calc, and you have some error reading the wind say .25 MOA (if you're good), and your scope clicks are .25 MOA spacing, it can all add up to a miss or bad shot. .5 + .9 +.25 + .25 +??? >= 1.9 MOA circle of accuracy.

For me, it's important to minimize all possible errors so you have the highest probability of clean kill shot. The drop calc is the easiest variable to get right. This gives you more room for error with the other factors.

I think it's more important to get it right when shooting animals than shooting a match because of what's at stake.

Paul Stimac
#23
11-20-2008, 02:43 PM
 Platinum Member Join Date: Feb 2005 Location: USA Posts: 2,598
Re: Figuring Drop based on "Come Ups"?

Quote:
 Originally Posted by pstimac Longshot38, The errors add up though. If you and your gun can shoot .5 MOA, and you are off nearly 1 MOA on your drop calc, and you have some error reading the wind say .25 MOA (if you're good), and your scope clicks are .25 MOA spacing, it can all add up to a miss or bad shot. .5 + .9 +.25 + .25 +??? >= 1.9 MOA circle of accuracy. For me, it's important to minimize all possible errors so you have the highest probability of clean kill shot. The drop calc is the easiest variable to get right. This gives you more room for error with the other factors. I think it's more important to get it right when shooting animals than shooting a match because of what's at stake. Paul Stimac
Acctualy it is worse than your example, becuase of the 9.44" error. Since it is an error you are not even aware of it before the shot. What this means is that the very best that you can do in the verticule plannes is 9.44" inches low. Now add in the .5 MOA which adds another 5" to the equation and as you can see the problems keeps compounding as well as the .5moa aiming error that lighting conditions can and do cause. Your circle that you can hit is lower than expected as much as 14" low, if this is not a huge huge error then I don't know what is
__________________
range it,check the wind, dial in correction, aim and only one shot

Last edited by jwp475; 11-20-2008 at 03:03 PM.
#24
11-20-2008, 04:59 PM
 Silver Member Join Date: May 2008 Location: Texas Posts: 151
Re: Figuring Drop based on "Come Ups"?

Quote:
 Originally Posted by jwp475 Acctualy it is worse than your example, becuase of the 9.44" error. Since it is an error you are not even aware of it before the shot. What this means is that the very best that you can do in the verticule plannes is 9.44" inches low. Now add in the .5 MOA which adds another 5" to the equation and as you can see the problems keeps compounding as well as the .5moa aiming error that lighting conditions can and do cause. Your circle that you can hit is lower than expected as much as 14" low, if this is not a huge huge error then I don't know what is
And all this conversation brings up back to one of the basic principals of Long Rang shooting. Verify your range tables with field data before attempting a shot and don't shoot unless you know you can make the shot. The tables created by ballistics software are nice and helpful but I use them as a starting point to make my own tables based on field data. I'm sure most of use here do the same.
#25
11-20-2008, 05:53 PM
 Platinum Member Join Date: Feb 2005 Location: USA Posts: 2,598
Re: Figuring Drop based on "Come Ups"?

Longshot38, I have maybe been lucky, but I have found that wne I feed ExBall the proper Info (Velocity, BC, Barometric pressure, etc) and lock them inot sight-in conditions and then imput my field data then my program matches my drop and works as designed.

I have gone from sea level to 7400" of elevation and the program accurately correct my drop tables for me. I have been and I currently am very satisfied with ExBall
__________________
range it,check the wind, dial in correction, aim and only one shot

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