The Gun Counter

Whenever shooting at distance and at a slope, either downhill or uphill you have to allow for gravity’s effect on your bullets flight…

Deflection Chart
Slope° Multiply by
00.......1.00
05.......0.99
10.......0.98
15.......0.96
20.......0.94
25.......0.91
30.......0.87
35.......0.82
40.......0.77
45.......0.70

Example = 300 yards @ 45° angle = 300 x .70= 210 yards if you’ve set your sights at 300 you’ll probably miss…

Example = 500 yards @ 33° = 500 x .87 (30°) = 435 plus 500 x .82 (35°) = 415 + 435 = 850÷2 = 425 yards

Published in American Rifleman, March 2006 issue, page 15


Here is a tool that helps to calculate the adjustments automatically in the field.

Submitted by SeekHer

[[Category: Shooting Tips and Techniques]]
[[Category: Rifle]]

Are they the same coefficient for both uphill and downhill?

Yes.

The Coeficient is just the Cosine of the angle. However, it's only a first approximation, as it does not account for loss of velocity due to air drag.