Manufacturer's SKU 0845H Manufacturer's Warranty Manufacturer defects - practical lifetime of product Brands Kestrel Feature / Environment Made in USA
The Kestrel 4500 NV with Horus ATrag Ballistics combines Kestrel's flagship meter, the Kestrel 4500 with Night Vision, with Horus ATrag Ballistics software to bring you the first lightweight, hand-held tool to give you both comprehensive environmental data plus integrated aiming solutions. Kestrel Pocket Weather Meters and Horus Vision partnered to provide a powerful shooting tool that combines the critical environmental data and targeting software solutions required for precision shooting.
Pre-programmed Guns: This unit can be used with any combination of scope and reticle, here are several pre-programmed guns that come in each unit:
Gun New Gun 223-BlkHill 308-M24 308-Scout 300-Win 338LabBlkHI 50BMG-HSM Muzzle Velocity 2900 2900 2600 2503 2900 2850 2905 Ballistic Coefficient 0.533 0.372 0.496 0.365 0.533 0.567 0.994 Bullet Weight (grains) 190 77 175 150 190 250 750 Bore Diameter (inches) 0.308 0.223 0.308 0.308 0.308 0.338 0.500 Zero Range (yds) 100 100 100 200 100 300 600 Bore Height (inches) 1.90 2.95 1.85 2.25 1.90 2.00 2.50 Rifling Twist (inches/revolution) 10.00 7.00 7.00 12.00 10.00 9.00 12.00 Rifling Twist Direction Right Right Right Right Right Right Right Click 1/tmoa 1/tmoa 1/toma 1/tmoa 1/tmoa 1/tmoa 1/tmoa *With the exception of New Gun, these can be removed/overwritten with the use of the Gun Loader software distributed by Horus Vision.The Kestrel can measure in TMOA (true minute of angle), SMOA (shooter minute of angle), and MILs (milliradians). The unit displays ballistic tables with data of the shot extending out to various distances (see Range Card on page 17 and 18 in the manual). This Horus meter can provide ballistics solutions out to 4000 yards (or about 3700 meters).What it does:Provides guidance on where to aim the rifle for a very precise shot.Here's how works:in real simple terms, what you do with this unit. Remember, it combines the top of the line weather instrument with the Horus Ballistic software, thereby negating the need for a PDA... its all in one.
While at home:
- Enter your gun(s) data so its in the unit. It can store up to 9 rifles at a time.
- Use Google Earth to determine your Latitude of the place where you'll be shooting. Pretty easy if going to a range, and can be adjusted if you are out in the field. Enter this date for "Lat", in the Environment menu.
- Calibrate the Kestrel compass
- Be sure "Auto" is set to Yes in the Environment menu
- Select the Gun
- Enter the Latitude (if you hadn't done so already at home)
See the target:
- View your range finder
- Enter the range (meters or yards)
- Enter the declination (this is typically provided by any laser range finder)
- With Tgt highlighted, point the unit in the direction of the target, push center button.
- Wind capture screen shows up, point the meter in the direction of the wind and push the center button (or allow it to run continuously for real-time updates to the firing solution.
- Aim accordingly and FIRE!The unit immediately will have told you how many clicks (or hairs) to adjust in your scope. ITS THAT EASY, AND THAT FAST!
What effects the calculation?
Wind speed, wind direction, altitude, humidity, heat index, temperature, and pressure effect the density and viscosity of air. Even slight changes in these parameters can have a big impact down range.It then takes into account the curvature of the earth, speed of earth's rotation, weight of your bullet, spin of your bullet, drop of the bullet based on distance and gravity.Why?It can take 2+ seconds for a bullet to reach its target. Not only must the shooter correct for wind, they must aim higher to account for the 'drop' incurred by the force of gravity over the course of the flight of the bullet.
Gun specific Information
Bullet specific Information
- Zero Range (ZR, distance at which target is exactly in cross-hairs)
- Bore Height (BH, center of barrel to center of scope)
- Adjustment Clicks (click, the amount of adjustment of the scope in MOA or MILS, provided by single click of the adjustment knobs)
- Rifling Twist (RT, distance/1 revolution of grooves in the barrel)
- Rifling Twist Direction (RTd, direction of rotation)
Bluetooth, do you need it?Because the unit is both the wind meter and ballistic software combined, it won't need to talk to anything else when used as a Horus unit in the field. Usually the answer to people is no, you don't need the BT. However, you would consider getting the BT if you were:
- Muzzle Velocity (MV, speed at which bullet leaves the barrel)
- Ballistic Coefficient (BC, drag coefficient of bullet)
- Bullet Weight (BW, weight of bullet measured in grains)
- Bullet Diameter (BD, diameter of the bullet)
- Changing out your guns frequently, as it quicker and easier to use a computer, but not necessary.
- Using the unit in just 4500 mode to communicate with other ballistic software you have.
- Were using the unit as a 4500 weather meter and wanted BT capability for logging data.
Horus software that comes with the 4500 Atrag Ballistics is the civilian version. The military version of the Horus ATrag Ballistics software is only available via special GSA contract to officials with the correct security clearance. The software that ships with the Kestrel 4500 Horus ATrag is version 4.61. It is possible to upgrade the firmware as new versions become available, however it will need to be returned for firmware updates. Version 3.0 is not upgradable. You can tell which version you have by just turning it on, you can not tell from the outside of the meter.
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