Target Solution

Target Solution Help

The current Gun and Cartridge settings are displayed at the top of the view.

Change Environmental Settings Button – If you wish the target solution to include local temperature and altitude select this button to enter them. See Environmental Settings Help file for more information.

Select Input Units – This is a Drop-Down Menu. The available options are:

  • Yards, inches, moa: (Yards, inches, m(inute)o(f)a(ngle) The English System units used in the inputs collected below. Drop and windage correction are shown in both inches and moa.

  • Yards, inches, mil: (Yards, inches, mil(milli-radian) Similar to first option except mil is used instead of moa. Select moa or mil to match the correction method provided by the scope manufacturer.
  • Meters, inches, moa: (Meters, inches, m(inute)o(f)a(ngle) Similar to first option except target distance units are Meters rather than Yards.
  • Meters, inches, mil: (Meters, inches, mil(milli-radian) Similar to second option except target distance units are Meters rather than Yards.
  • Meters, cm, mil: (Meters, centimeter, mil(milli-radian) All metric unit system. Bullet path is shown in centimeters instead of inches.

The selected units will be reflected in the input prompts below.

  • Target Distance – The distance to the target in the specified units.

  • Target Direction (relative to the line of sight) – The direction the target is moving in degrees. Away from the shooter is 0 degrees, right angle to the right of the line of sight is 90 degrees, toward the shooter is 180 degrees, right angle to the left of the line of sight is 270 degrees. The correction when the target is moving directly toward or away from the shooter is too small to be concerned with. The changing distance to the target in this case is much more important.

  • Gun Bore Elevation – The units for this item are always degrees. Enter 0 for flat or small angle shooting. This entry will correct the computed bullet drop for the angle the gun bore makes with level (also called line of sight angle). A bullets drop is determined by the horizontal, not the total distance to the target. Most shooters shoot high when engaging uphill or downhill targets at angles greater than 30 degrees and distances greater than the sight zero distance. Always enter this as a positive number, irregardless of whether it is uphill or downhill. The difference for uphill versus downhill trajectories is negligible for shooting solutions out to 1000 yards. For example a 270 Winchester with a muzzle velocity of 3060 fps has only a quarter inch difference in the target solution at 1000 yards for 45 degrees uphill versus 45 degrees downhill.

  • Wind Speed – The wind speed in the specified units.
  • Wind Direction (relative to line of sight) – The units for this item are always degrees. Enter a wind blowing at a right angle to the right of the line of sight as 90 degrees, and blowing to the left at a right angle to the line of sight as 270 degrees. The correction required for a wind blowing toward the target (0 degrees) or towards the shooter (180 degrees) is too small to be concerned with.

Spin Drift Correction – This is a Drop-Down Menu. The available options are:

  • No Correction – Spin drift will not be computed.

  • Right Hand Twist – Spin drift will be computed for right hand twist (clockwise) rifling.

  • Left Hand Twist – Spin drift will be computed for left hand twist rifling.

The spin drift and wind drift values will be added and displayed together in the “Wind + Spin Drift” column on the report. This value will also be combined with the target lead value in the “Net Windage” value on the report. To see just the effect of spin drift, set the wind speed to 0.

Note that the sight zero distance value of spin drift is subtracted from the value of spin drift at the target distance. To compute spin drift, the cartridge properties must have a bullet length. This can be added to the cartridge by doing a “long selection” on the cartridge and choosing “Edit This Cartridge Profile”. The spin drift correction value at the rifle zero distance can be displayed by displaying the Target Solution for a range of “0”.

Display Target Solution Button – Press when your are done with the inputs. No fields can be blank. Enter zeros for those you don’t care about. The target solution will be displayed on the next screen.

Sight Selection – This is a Drop-Down Menu whose result may be used in the Simulate Sight Alignment View in the future. The options depend on the rifle characteristics. If the gun profile indicates “iron sights”, then the only available option will be “Open Sights”. If the gun profile indicates “Scope” then the available options are:

  • Scope 1.5 Power: This is normally a handgun scope.

  • Scope 3 Power: This is either a fixed power scope or a variable power scope set on the 3 power setting.
  • Scope 6 Power: This is either a fixed power scope or a variable power scope set on the 6 power setting.

  • Scope 9 Power: This is either a fixed power scope or a variable power scope set on the 9 power setting.
  • Scope 12 Power: This is either a fixed power scope or a variable power scope set on the 12 power setting.

Simulate Sight Alignment Button Press when your are done with the inputs. No fields can be blank. Enter zeros for those you don’t care about. A running boar silhouette sight simulation will be displayed on the next screen.

Wind and Target angles are shown in the figure. Line of Sight runs from bottom to top on the N S line. Muzzle is at N.

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