Calculating firing solution with angle

KISS
shooting low , aim high
shooting High, aim low

Was squirrel hunting, 20 foot away from truck, squirel was about 18 foot high, aimed @ middle of head, hit the shoulder,
Click to expand...
It's actually:

Shooting low, aim low.
Shooting high, aim low.

It's the same adjustment whether aiming upwards or downwards.

Hitting lower on the squirrel than expected in the scenario described, is probably due to shooting at very close range.

When shooting a rifle (especially a scoped rifle) at close range, the bullet will hit lower than expected because the bore is quite a bit below the sights. Shooting upwards will make the bullet impact higher than it otherwise would, but probably not enough to get it up to the sightline within 6-7 yards from the muzzle.
 
jonnefudge said:
I am rather new to shooting and just bought this app ballistic arc. I have a really hard time understanding the results when it is calculating firing solution when firing in a angle uphill or downhill. I can not understand how it can more hold over on flat ground than shooting upward and also how small the hold over difference is between uphill or downhill.

Three solutions is provided below with 0, 30 and -30 degrees respectively.

Any input is greatly appreciated!

Jonne
Sweden



Rifle Scenar n140
Position 65.8° 21.7°
Shot Bearing 229°
Shot Angle 0.2°
Wind 2.1 m/s @ 360°
Pressure 29.9 in Hg
Temperature 1 °C
Relative Humidity 84%
Density Altitude -4041 m
Range (m) Elevation (mils) Wind (mils) Velocity (m/s) Energy (J) Time (sec)
0.0 * * 792 3150 0.00
100.0 0.0 R 0.1 727 2657 0.13
200.0 U 0.6 R 0.2 666 2226 0.28
300.0 U 1.6 R 0.3 607 1852 0.43
400.0 U 2.8 R 0.4 552 1529 0.61
500.0 U 4.1 R 0.5 499 1250 0.80
600.0 U 5.6 R 0.6 448 1008 1.01
700.0 U 7.5 R 0.7 400 803 1.24
800.0 U 9.6 R 0.8 355 632 1.51
900.0 U 12.1 R 1.0 319 511 1.81
1000.0 U 15.1 R 1.1 302 459 2.13


Rifle Scenar n140
Position 65.8° 21.7°
Shot Bearing 229°
Shot Angle 29.9°
Wind 2.1 m/s @ 360°
Pressure 29.9 in Hg
Temperature 1 °C
Relative Humidity 84%
Density Altitude -4041 m
Range (m) Elevation (mils) Wind (mils) Velocity (m/s) Energy (J) Time (sec)
0.0 * * 792 3150 0.00
100.0 D 0.1 R 0.1 727 2653 0.13
200.0 U 0.5 R 0.2 665 2221 0.28
300.0 U 1.4 R 0.3 606 1847 0.43
400.0 U 2.4 R 0.4 551 1525 0.61
500.0 U 3.6 R 0.5 498 1247 0.80
600.0 U 5.0 R 0.6 448 1007 1.01
700.0 U 6.7 R 0.7 400 803 1.24
800.0 U 8.6 R 0.8 355 633 1.51
900.0 U 10.9 R 1.0 319 511 1.81
1000.0 U 13.6 R 1.1 302 457 2.13




Rifle Scenar n140
Position 65.8° 21.7°
Shot Bearing 232°
Shot Angle -29.8°
Wind 2.1 m/s @ 360°
Pressure 29.9 in Hg
Temperature 1 °C
Relative Humidity 84%
Density Altitude -4041 m
Range (m) Elevation (mils) Wind (mils) Velocity (m/s) Energy (J) Time (sec)
0.0 * * 792 3150 0.00
100.0 D 0.1 R 0.1 728 2660 0.13
200.0 U 0.3 R 0.2 666 2230 0.28
300.0 U 1.1 R 0.3 608 1856 0.43
400.0 U 2.1 R 0.4 552 1532 0.61
500.0 U 3.2 R 0.5 499 1251 0.80
600.0 U 4.4 R 0.6 448 1008 1.01
700.0 U 5.9 R 0.8 399 801 1.24
800.0 U 7.7 R 0.9 354 629 1.51
900.0 U 9.8 R 1.1 318 509 1.81
1000.0 U 12.3 R 1.3 303 460 2.13
Click to expand...

I have been shooting and reloading for over 45yrs now and I wouldn't waste my time on that. What ever rifle that stuff came from, it's not your's. Beside that I haven't a clue what I'm looking at there!
 
Beside that I haven't a clue what I'm looking at there!
Click to expand...

Dont know why, thats nothing more then computer results of what we use to do by hand.

Now we have smart phones, laptops, LRFs that give up the info which (regarding angle shooting) is nothing more then the cosine of the angle, times the distance to give us the distance we need to adjust for, up or down.

The data provided just shows us the input data and firing solutions.
 
I use a ballistic computer to get me in the neighborhood, but there’s no substitute for keeping DOPE and figuring out the load and the rifle. The computer says what it should do. Your DOPE says what it does. In my experience those are close, and close enough under 500yds, but that’s when they start wandering off. If you want to shoot with pecision at distance you have to learn how that particular rifle with that particular load behaves in reality.

There is something to be said for putting the computer away figuring it out long hand. It builds the good habits of keeping accurate logs, and forces you to think about how it works rather than just reading a value and dialing...
 
It stands to reason that you must have worked out the door to know where to dial. If my angle compensated range says 670, I have to know how to dial in 670.
 
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