Ballistic calculator

Its an Athlon Argos 6x24x50 MOA. It's definitely a 1/4 moa scope. I've tried these calculators with three different rifles, and they will not match up with any of them.

6.5 Grendel 20" proof research barrel
100gr. Lapua Scenar
Distance is 500 yrds
Altitude is 580
Pressure is 29.9
Temp is 79
Humidity is 52%
M.V. 2780
100 yrd zero
Athlon Argos 6x24x50 1/4"MOA
Scpoe height is 2.75
No wind, no angle
Shooting Nort/South
The two editions of Bryan Litz's book ballistic performance of rifle bullets did not list a 100 grain Lapua Scenar the closest one I could come up with is 108 grain
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The short and quick answer is garbage in garbage out one of your input must be off and off a great deal could be something as simple as a decimal point in the wrong place
I have checked, and rechecked the information numerous times, and nothing lines up. This Grendel is a 1/4 moa rifle. I can shoot bullet drops, measure them, adjust my scope for said drops, and it's spot on. I just can't get the ballistic calculators to line up with the ballistics of the rifle. I have the same problem with my other rifles. I have a Remington 700 long range in 300WM, and I run into the same problem with it.
 
I have checked, and rechecked the information numerous times, and nothing lines up. This Grendel is a 1/4 moa rifle. I can shoot bullet drops, measure them, adjust my scope for said drops, and it's spot on. I just can't get the ballistic calculators to line up with the ballistics of the rifle. I have the same problem with my other rifles. I have a Remington 700 long range in 300WM, and I run into the same problem with it.
Time to give BallisticAE a try, works for me
 
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