System: The integration of weather, range, ballistics, optics and a precision firing platform. Clockwise from right: The FN SPR-A1 with Horus Falcon 5-20×50 scope with an H25 reticle, the Vectronix LRF, Horus ATragMX ballistics computer and the Kestrel 4500 pocket weather meter. The author ranges the target with the Vectronix LRF attached via cable to the ATragMX Ballistics Computer.

For precision shooters, the operational challenge of getting a safe and accurate first-round shot grows increasingly complex as defense and law enforcement units are tasked with both expanded missions and an increased sensitivity towards liability. For snipers, success requires more than what one Army instructor referred to as “lying on your stomach and making an accurate shot.” Distances to multiple targets, shot angle—particularly in urban environments—as well as environmental factors all combine to impact ballistic performance and optics adjustment. TW combined the FN SPR rifle and Horus/Vectronix SORD ballistics and ranging system to test two of the industry’s newest precision shooting tools and learn if the combination was greater than the sum of its parts.

Special Police Rifle

FNH USA’s SPR (Special Police Rifle) series was designed with simplicity and reliability in mind. The SPR was awarded an FBI HRT (Hostage Rescue Team) contract in 2004, and according to FN, “The SPR A3 was selected after a 10,000- round endurance test with two rifles resulting in no parts breakage, misfires or malfunctions while exceeding the accuracy requirement of .50 MOA.” TW evaluated the SPR A1 for this article.

The SPR’s pre-’64 Winchester action features a claw extractor and the traditional CRF (controlled round feed) mechanics. While volumes have been written in the debate between CRF and “push feed actions,” the Mauser-inspired claw does reliably control the round via contact with the rim throughout the cycle (as opposed to the push feed which engages the rim only when the bolt handle is turned down and fully locked).

Author: Len Waldron
Read original article: www.tactical-life.com

Judging wind is probably the most difficult aspect of long-range shooting. Former SOF sniper Steve Adelmann has some tips on how to master the breeze in part 1 of this two-part series.

Learning to read winds and apply useful corrections to hit long-range targets is one of the more difficult precision-shooting tasks to master. The more time a projectile spends in flight, the more time winds have to move it off the intended path. Therefore, accurate wind estimation becomes more critical as the bullet’s flight time increases due to long-range or slow-moving projectiles. I can’t provide a detailed lesson here, but hopefully this two-part primer will help get you headed (or holding) in the right direction.

There are good arguments for measuring winds at the shooter, the target or somewhere between. I’ve experienced the pros and cons of each method, but prefer to look most closely at winds from the halfway point on out to the target. In open country and rough terrain, winds coming from opposite directions are common and appear anywhere along the bullet’s path. If you plan to hit challenging targets, you’ve got to find and factor in those winds. Low light, extreme heat or extended ranges will further complicate accurate wind measurements downrange. In those cases, or whenever winds are noticeably different near the firing line, I factor them in as well.

Handheld anemometers like the battle-tested Kestrel 4000 have been the “gold standard” for measuring winds in the field for many years. I use one for winds and other atmospherics that factor into precision-firing solutions. Anemometers have two weaknesses: They’re electronic devices that eventually fail and they only read winds at their current position. Unless you have an elaborate system of multiple sensors attached to transmitters, they won’t give you downrange data. Fortunately, your eyes can provide the downrange clues needed. Look for these natural indicators between the firing line and target:

• Wind felt on the face/body
• Low-to-ground vegetation (long grasses, weeds)
• Deciduous trees (longer branches, larger leaf surface
  areas to catch more wind)
• Coniferous trees and bushes
• Blowing dust from loose surface material or bullet impacts in dirt/sand
• Flags or streamers (if present) ! Rain (lateral movement while falling)
• “Mirage” effect created when light refracts as it passes through different densities of air

Each of these indicators has different levels of observable movement to indicate wind speed and direction. If you have an anemometer, practice your skills by judging winds visually then check your work electronically to adjust the “calibration” of your eyes. Judging visual indicators such as dust, flags and vegetation comes fairly easily with practice, but estimating speeds based on mirage requires more effort to master.

The mirage we use for shooting is the same effect seen over pavement on a sunny day. As the sun heats the ground, rising thermal layers and water vapor rise. Any wind component present will push these layers in a detectable direction, creating a visible mirage. Spotting this effect between you and your target allows determination of the two factors needed: direction and speed. The former is determined by watching the waves closely to see the direction of drift as they rise from the ground. You can practice this by simply looking at the roof of a car on a hot summer day from several feet away. Compare what you see in the rising vapors with the wind you feel to get the hang of it before ever firing a round on the range. Speed judgment takes more practice. Mirage varies from “boiling” waves that appear to shimmer as they rise straight up when there’s no wind to horizontal waves moving rapidly, low to the ground in 10-15 mph winds. Above 15 mph, mirage is harder to see because the wind moves the waves laterally out of sight too fast to detect them. My experience has been that at 15 to 20 mph mirage starts to disappear. The good news is that as winds get higher, other indicators, such as blowing branches and debris, become more apparent and reliable for judging wind values.

Mirage can be especially tough to see on cloudy days and in cool weather. Look for a horizontal surface in the vicinity of the target, such as a rooftop, railroad timber, cement pad or target frame and focus on its top edge. The darker the color, the easier it is to see mirage. To find mirage closer to your position, change the focus of your optics to a point 1/2 to 2/3 of the distance to the target. Opposing winds may offset or cancel each other out completely, so look closely. If winds are gusty, either wait for lulls or apply your corrections into the direction the wind is coming from either by adjusting sights or by holding into the wind. Part 2 of this series will discuss different methods of applying the measured wind speed and direction to your shooting.

Author: Steve Adelmann
Read original article: www.shootingillustrated.com

“Another critical and often overlooked component in ballistic testing is weather data. It may be difficult to duplicate a particular load or result if you are not aware of the climatic conditions at the time of testing. To record important and necessary weather data, I have been using the Kestrel Model 4000 hand-held weather station. This instrument is simple to use and provides you with more [than enough] data than you will need.”

Originally published in “The Varmint Hunter Magazine”
Read original article: Download PDF (1.3 mb)

Kestrel Pocket Weather Meter: Monitors Concrete Curing The Kestrel 4300 Construction Weather Meter is designed for instant measurement of ambient conditions at the site of a concrete pour. The pocket−sized weather meter features integrated Bluetooth data transfer to instantly send weather data to a laptop or smart phone. Kestrel Pocket Weather Meters; 800−784−4221; www.kestrelweather.com

Originally published: March 25, 2011

“We’re all obsessed by the weather but even more so when we’re planning our weekend boating. This weather meter is a must-have gadget to keep on board and impress your crew with up-to-the-minute forcasts. It features an easy-to-read display with backlight, on which it shows wind speed and maximum gusts. It will also tell you the water temperature before you swim – rather more accurately than your big tow.”

Originally published in “Motor Boat Yachting”
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Originally published in “Shooting Sports News”
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We reviewed the Kestrel 4500 in 2008 as a useful for target shooters and hunters, but had not had the opportunity to take it into the mountains ourselves. That changed in February 2010, when I traveled to the Floridas Mountains of New Mexico on the Mexican border to hunt for Persian Ibex.

The Floridas are among the roughest mountains in the Rocky Mountain chain. They are simply large piles of disintegrating conglomerate rock, shale and cactus rising straight up from the desert s floor. No gentle slopes to gradually work your way up; all access are by goat trails at incredible angles.

The ibex is well suited to this terrain as their hooves have a soft inner area which is surrounded by the hard material of the outer hoof. In essence, they function like suction cups, allowing the critter to go anywhere they wish in the rocky terrain. Often, into areas that not even Spiderman could traverse. One of the guides remarked that Ibex are gyro- stabilized with flypaper feet, capable of walking on a six inch wide ledge at a 75 degree angle. Of course, humans are not.
I recorded the winds, air temperature and barometric pressure several times each day during our hunt. Although the skies were clear and the winds were mild (0-5mph), conditions can change drastically in those mountains. For six days, the weather was perfect and the K4500 indicated no changes were coming. On the afternoon of the seventh day, the winds abruptly increased to 25 mph. We were so high up and precariously perched on the ledge of a cliff that I asked my guide to take the wind reading. (I don t like the edges of cliffs when the winds are howling.) When he handed me the Kestrel back, I checked the barometric pressure and found it had dropped drastically in the past thirty minutes and so had the temperature (from 60 degrees down to 50).

Although I am not a meteorologist, I surmised that with those two parameters tanking, a major weather front was about to move it. There was still some time for hunting left, so we stayed put, but I monitored the K4500 every half hour.

Just before dark, I shot a nice Ibex with my Savage muzzle loader. After a brutal climb down to the Ibex, we began the process of dressing and caping. I checked the Kestrel again and the temperature was still dropping, from 50 degrees to 35 degrees, and the barometric pressure was even lower. I told my guide that we had better hurry up and get out of these mountains, NOW! We called in the other two guides to assist us in packing out the meat and headed down of the mountain.

We arrived at our base camp at 9:00 PM, having hiked for three hours in the dark. By now, the winds had died down and everyone was wondering if the K4500 had given us a false alarm. We had our answer by the next morning. Clouds had rolled in overnight and snow covered the mountains. By mid-morning, the winds quickly reached 45 mph at our base camp, creating a sandstorm that made it impossible to see the base of the mountains and it was cold as hell.

Bottom line, if we had been in those mountains when the storm hit, it would not have been good. It was obvious to everyone that the K4500 saved our party from a potentially disastrous situation. As I said in my original article, if you are going into the mountains, you should take a Kestrel. It is the cheapest insurance policy you can buy.

Originally published in “Guns and Shooting Online”
Author: Dr. Jim Clary

Originally published in “Farm and Dairy” Magazine
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