Tactical Watch with Full-Featured Horus Ballistics Calculator

Just when we thought we’d seen everything, Horus Vision has teamed up with 5.11 to create a wristwatch with a built-in ballistics calculator. Priced at $219.99, the 5.11 Ballistics Field Watch incorporates the Horus Vision SureShot™ ballistic calculator, plus a digital compass to indicate direction and degree. The watch has a molded polycarbonate body, offered in three color choices: black, olive drab, and coyote tan. Equipped with a backlight for night use, the 5.11 Field Watch also features dual time zones, a stopwatch, a countdown timer, and alarm.

Full-featured Ballistics Calculator
The ballistics functions are fairly complete. Using the four control buttons you can input temp, scope height (above bore), altitude, zero range, target distance, inclination (up/down angle), wind speed, wind direction, bullet BC (Ballistic Coefficient), and Muzzle Velocity. Then the watch will calculate your elevation and windage correction in either Mils or MOA-fraction clicks. It’s amazing that Horus was able to pack all these features into a normal-sized watch.

CLICK HERE for full explanation of Watch Functions with Interactive Demo.

NOTE: This online product demo is very cool. By clicking the buttons on an interactive watch mock-up, you can test all the functions and see how to input values into the Ballistics Calculator.

We haven’t compared the Horus/5.11 Ballistics Calculator watch with more sophisticated ballistics programs, but if you can remember all the buttons to push (and in what order) this watch appears to be a compact alternative to a laptop or PDA with ballistics software installed. Buyers have rated the watch highly: “Brillliant — I ordered the 5.11 Tactical Field Watch for my husband to use on his tour in Afghanistan. He loves it. He loves every feature it comes with and says that it’s accurate and durable. This watch highly recommended and in high demand.”

CLICK HERE for more detailed product review from DefenseReview.com.

Shooting Skills: Reading the Wind When Hunting

Thomas Haugland, a Shooters’ Forum member from Norway, is a long-range target shooter and hunter. He has created an interesting video showing how to gauge wind velocities by watching trees, grass, and other natural vegetation. The video commentary is in English, but the units of wind speed (and distance) are metric. Haugland explains: “This is not a full tutorial, but rather a short heads-up to make you draw the lines between the dots yourself”. Here are some conversions that will help when watching the video (thanks Boyd):

.5 m/s = 1.1 mph | 1 m/s = 2.2 mph | 2 m/s = 4.5 mph
3 m/s = 6.7 mph | 4 m/s = 8.9 mph | 5 m/s =11.2 mph

More Interesting Videos from Norway
There are many other interesting videos on Haugland’s YouTube Channel, including Game Stalking, Precision Reloading, and Tips on how to use a Mildot Reticle on a scope with MOA-based clicks.

MOBALL Deployable Ballistics Computer from Bryan Litz

There are a variety of ballistics programs that can be used with handheld PDAs, and even Apple iPhones. But Bryan Litz, author of the new Applied Ballistics for Long Range Shooting book, has come up with something bigger and better. Employing the powerful Texas Instruments (TI) Voyage 200 graphing calculator, Bryan has created a Mobile Ballistics Solution (MOBALL) that is more sophisticated (and accurate) than typical PDA-based programs.

MOBALL includes TI graphing calculator and ballistics software. Kestrel windmeter NOT included.

Bryan tells us: “The Mobile Ballistics Computer (MOBALL) was created for one purpose: to provide shooters with the most accurate and complete ballistic firing solution possible for application in the field.” MOBALL runs on a TI graphing calculator — a sturdy, stand-alone, non-network device. That means you don’t need long-term cell phone contracts, expensive data plans, or weekly OS “updates” and patches. The TI also delivers long run-time on ordinary AAA batteries. That’s a big advantage over most laptop computers, which run out of “juice” after only 4-5 hours in the field.

According to Bryan, what sets MOBALL apart from other “deployable” ballistics calculators is that: “MOBALL provides a complete ballistic solution, with the ability to account for every major and minor variable affecting a bullets trajectory. In addition to the standard variables like atmospherics, uphill/downhill angles and wind, MOBALL also has the ability to account for more subtle ballistic effects like spin drift, Coriolis effect, and multiple winds in up to 3 zones.”

Importantly, Bryan’s MOBALL device can employ Ballistic Coefficients (BCs) referenced to the G7 standard. Compared to the older G1 BC model, the G7 BC standard better matches the characterics of the long, boat-tail bullets actually used by long-range shooters. Trajectories calculated using the G7 BC are more accurate for long-range bullets because the G7 BC doesn’t vary with velocity like the conventional G1 BC.

The difference between G1 and G7 BCs is explained online in the Berger Blog article A Better Ballistic Coefficient. The subject is also discussed in detail in Chapter 2 of Bryan’s Applied Ballistics book.

At $290.00, MOBALL isn’t the least expensive option for a mobile ballistics device, but that price includes the TI Voyage 200 graphing calculator, worth $180.00 by itself. Bryan adds: “As already mentioned, the feature set is extensive, and the software is much more sophisticated than most ballistics programs designed for PDAs. The solution is VERY accurate (CLICK to download MOBALL Accuracy Report). Also, the TI Voyage 200 is an impressive device itself, capable of solving advanced engineering and math problems. If you’re a high school/college student, engineer, etc, the TI Voyage 200 can be used for many school and work tasks unrelated to ballistics.”

Save $20 on MOBALL and Ballistics Book Combo
As a special Holiday Offer valid through December 31, 2009, you can save money when purchasing MOBALL and Bryan’s Applied Ballistics book together. The book and MOBALL unit are being offered as a Holiday Combo Set for $309.95. That’s a $20 savings over the $329.95 cost of purchasing both book and MOBALL unit separately.

Great Gift Books for Serious Shooters

Christmas Day is just two weeks away. Books have always been popular Xmas gifts. If you haven’t completed your holiday shopping, here are some recommended titles that should please the serious shooters and firearms enthusiasts on your shopping list. For Shooting Clubs, books also make great end-of-season member awards. Most of us would rather have a useful book than one more piece of wood to toss in a box in the closet.

Here are six recommended titles, in alphabetical order:

	Applied Ballistics for Long-Range Shooting by Bryan Litz, $39.95 (Hardcover) If you’re a serious long-range shooter you NEED this book. Since its release earlier this year, this 536-page hardcover has become the definitive resource on long-range ballistics and bullet design. While Bryan covers some very advanced topics, Bryan does a very good job of making the text comprehensible to the layman. You don’t need a degree from MIT to read this work. Bryan’s book comes compete with a CD packed with ballistics software and additional reference materials.
	A Hunter’s Wanderings in Africa by Frederick Courteney Selous, $19.95 (Softcover) Frederick Selous was a legendary African hunter. It was for him that Tanzania’s famous Selous Game reserve was named. If you have an interest in big game hunting in Africa, you should get this book. As readers have noted, this is “Classic Africana”… “one of the very best exploration/hunting history books about Africa”. It is an excellent book, well-written and “all about hunting”. Selous’ life was full of adventure, and his book lets readers experience, vicariously, the danger and excitement of African hunting in a bygone era.
	Precision Shooting Reloading Guide Edited by Dave Brennan, $22.95 (Spiral Bound Softcover) This handy reference guide contains scores of useful tips from many top shooters. However, this is NOT a load manual. Rather, it explains the techniques for precision reloading, and offers advice on how to get the “Nth” degree of accuracy from your handloads. Each topical chapter is authored by a different expert. Chapters include: Reloading for Extreme Accuracy, High Power (Bolt Guns), High Power (Gas Guns), Benchrest, Magnums, Wildcats, Cast Bullets, and working up an accuracy load. Readers have praised this compact (5.5″ x 8.5″) reference: “I’ve been reloading for many many years, and [this] book still managed to contain pearls of wisdom I’d never heard before.” –T. Pratt.
	Prone and Long-Range Rifle Shooting by Nancy Tompkins, $34.95 (Softcover) Tompkins’ 318-page treatise is a must-read for serious Palma, F-Class, and High Power shooters. Topics include Mental & Physical training, Reading Wind & Mirage Shooting Fundamentals, International Competition, and Loading for Long Range. Nancy Tompkins is a 4-time winner of the National Long Range Championships, and has won countless other major events. Nancy has been on six Palma Teams (as both a shooter and a coach).
	Rifle Accuracy Facts by Harold R. Vaughn, $34.95 (Softcover) Decades after it was written, Vaughn’s work remains a seminal treatise on accuracy. Vaughn was a serious scientist, working for the Sandia National Laboratories. Many “gun writers” toss out hunches about rifle accuracy. Vaughn, by contrast, did serious empirical testing and statistical analysis. Vaughn wondered why some guns shot well while seemingly identical rifles did not. Vaughn studied fine details in a way that often ran contrary to conventional wisdom. Rifle Accuracy Facts covers a wide variety of topics, including internal ballistics, chamber design, barrel vibration, bullet imbalance, external ballistics, scope design and more. Writer Boyd Allen notes: “If you are serious about precision shooting, Vaughn’s book belongs in your library.”
	Rifleman’s Guide to Rimfire Ammunition by Steven Boelter, $29.95 (Softcover) Steven Boelter’s 352-page book is a comprehensive study of all types of rimfire ammunition (including 17s and 22 mags), with over 600 photos. In a remarkable undertaking, Steven Boelter fired every brand and sample of rimfire ammo he could acquire (including 22LR, 17 Mach 2, 17HMR and 22 WMR), and recorded all the results. In all, Steven tested 11 brands and 137 different rimfire rounds, firing over 32,000 test rounds.

Ballistics Factors: Altitude and Air Pressure

One of our readers asked “What effect does altitude have on the flight of a bullet?” The simplistic answer is that, at higher altitudes, the air is thinner (lower density), so there is less drag on the bullet. This means that the amount of bullet drop is less at any given flight distance from the muzzle. Since the force of gravity is essentially constant on the earth’s surface (for practical purposes), the bullet’s downward acceleration doesn’t change, but a bullet launched at a higher altitude is able to fly slightly farther (in the thinner air) for every increment of downward movement. Effectively, the bullet behaves as if it has a higher ballistic coefficient.

Forum members Milanuk explain that the key factor is not altitude, but rather air pressure. Milanuk writes:

“In basic terms, as your altitude increases, the density of the air the bullet must travel through decreases, thereby reducing the drag on the bullet. Generally, the higher the altitude, the less the bullet will drop. For example, I shoot at a couple ranges here in the Pacific Northwest. Both are at 1000′ ASL or less. I’ll need about 29-30 MOA to get from 100 yard to 1000 yards with a Berger 155gr VLD @ 2960fps. By contrast, in Raton, NM, located at 6600′ ASL, I’ll only need about 24-25 MOA to do the same. That’s a significant difference.

One thing to remember — it is the barometric pressure that really matters, not simply the nominal altitude. The barometric pressure will indicate the reduced pressure from a higher altitude, but it will also show you the pressure changes as a front moves in, etc. which can play havoc w/ your calculated come-ups. Most altimeters are simply barometers that read in feet instead of inches of mercury.”

As Milanuk states, it is NOT altitude per se, but the LOCAL barometric pressure (sometimes called “station pressure”) that is key. The two atmospheric conditions that most effect bullet flight are air temperature, and barometric pressure. Normally, humidity has a negligible effect.

One important thing to remember is that the barometric pressure reported on the radio (or internet) may be stated as a sea level equivalency. So in Denver (at 6,000 feet amsl), if the local pressure is 24″, the radio will report the barometric pressure to be 30″. If you do high altitude shooting at long range, bring along a Kestral, or remember to mentally correct the radio station’s pressure, by 1″ per 1,000 feet.”

You can do your own experimental calculations using FREE Point Blank Ballistics software. Here are two printouts, one showing bullet trajectory at sea level (0′ altitude) and one at 20,000 feet. For demonstration sake, we assigned a low 0.2 BC to the bullet, with a velocity of 3000 fps.

Trajectory of Bullet fired at Sea Level

Trajectory of Bullet fired at 20,000 feet

Here’s a useful resource on External Ballistics if you want to learn more about the effects of altitude and barometric pressure on bullet flight.

NEW URLs for JBM Ballistics Program

The web-based JBM Ballistics Program is one of the most sophisticated and accurate ballistics calculators available — and it’s free. The latest version of the JBM Trajectory Calculator includes field-test-derived actual G7 BCs, as well as bullet drag data from Lapua’s Doppler radar testing. Whenever we have web access, the JBM program is our “go-to” resource for dependable ballistics calculations. In our experience, with most bullets, if you input all the correct variables for the JBM program, it should get you within 1/2 moa (2 clicks), at 600 yards.

The creator of the JBM program advised us that some of the URLs for the calculations pages have changed. You may want to update your bookmarks with the following web addresses:

JBM Calculations Entry Page: www.jbmballistics.com/calculations/calculations.shtml.

JBM Advanced Trajectory Calculator: www.jbmballistics.com/cgi-bin/jbmtraj-5.0.cgi.

JBM Simple Trajectory Calculator: www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.0.cgi.

JBM Trajectory Cards (Come-up Table) Generator: www.jbmballistics.com/cgi-bin/jbmcard-5.0.cgi.

Greatest Hits: Ballistics App for I-Pods and I-Phones

LINK: Advanced Ballistics Program for I-Phones and I-Pods
Apple’s I-Phone and I-Pod offer a superb user interface with serious computing power. Here’s a very trick software App (good enough for the U.S. military) that runs ballistic calcs and even has a bullet database.

Another Amazing Video from Kurzzeit.com

Werner Mehl, the engineering genius behind Kurzzeitmesstechnik (Kurzzeit), a German technology company, has come up with another spectacular ultra-slow-motion video. Werner has developed some of the most advanced video equipment in the world, allowing him to film bullets in flight with frame rates up to 1,000,000 frames per second. That’s not a misprint — some of the Kurzzeit video cameras can record at ONE MILLION frames per second, though typical Kurzzeit “high-speed” videos might be shot at 200,000 or 250,000 frames per second.

This 10-minute video was specially prepared by Werner for the 2009 SHOT Show. A masterpiece of high-speed movie-making, Werner’s video displays an amazing array of projectiles and targets. You can see bullets hitting armored and non-armored targets, bullets ripping through ballistic gelatin, bullets shattering glass, and even shotgun pellets striking rifle bullets in mid-air. Look for the effect of hollow points as they pass through the ballistic gelatin, and at the 4:26 mark you can see an airgun pellet slice though a paper target.

High-Tech Equipment from Kurzzeit
In addition to producing high-speed video equipment, Kurzzeit builds the PVM-21, the most advanced consumer chronograph on the market. The “all-infrared, all the time” PVM-21 works in any lighting conditions, including total darkness. It employs two banks of infrared sensors (front and back — the black boxes in right photo). These are aligned vertically and placed 8″ apart (left to right.) That gives you a huge 4.5″ x 8″ sensor area to register shots. We’ve worked with some other chronographs where the practical “sweet spot” for reliable results was just 2″ x 2″, when using an air rifle. The PVM-21’s large sensor area makes it easy to align your rifle, and you don’t get errors if your shot is just a little off-center.

The PVM-21 can hook up directly to a lap-top computer. That way you can record all your shot velocity data directly into a spreadsheet. The PVM 21’s large sensor area and software interface make the PVM one of this Editor’s favorite chronos, along with the classic Oehler model 35P. In the USA, the Kurzzeit PVM-21 is sold by Neconos.com. The $749.95 price includes sensor unit (with infrared), processing/display unit, infrared remote control, and software. It’s an impressive package — we just wish Werner would upgrade the display unit to include a rechargeable 12V DC battery. Right now you need to use an inline 120V AC to 12V DC transformer, or carry a separate 12V battery. I personally prefer to use a 3.5″x1.5″ rechargeable 12V battery rather than a 120v transformer and extension cords.

Coming Soon… Ballistics Software Package for Cell Phones

One of our readers, Rafal Walczowski, revealed that programmers from Poland have developed ballistics software for cell phones. The new program, KABAL, should be able to operate in over 90% of programmable mobile phones. Rafal tells us: “Our idea was to develop software which could be used on the most common devices people carry all the time — mobile phones.” Current mobile ballistics programs require a separate device (such as a Windows PDA), or are limited to a single type of phone (e.g. the KAC program for the I-Phone). The Polish developers came up with a handier, more universal application: “We made software that should work on every device with JAVA MIDP.2.0. That should work for about 90-95% of the phones on the market. And, later, we will make a KABAL version that runs with older versions of JAVA.”

Rafal reports the KABAL Ballistics program for mobile phones has worked well in field tests: “The algorithm for our calculator was field-tested for 18 months at ranges up to 1076 meters. Many different calibers, rifles, and bullets were employed during testing. We are pleased with the results, even when compared to QuickTarget and Exbal programs. Our KABAL program often proved more accurate, especially for long-range calculations, whereas QuickTarget and Exbal could be too optimistic.”

English Version Coming Soon — and Free BETA Version Online
Rafal reports: “Several weeks ago we finished the Polish version of KABAL and we are selling it for mobile phones. We are now are working on an English-language version, which is currently in beta testing.” There is a free English test version that works in a PC browser. This includes a BC database, a bullet stability calculator, plus tooltips describing each field. You can try out the free online beta version by clicking the link below. Rabal adds: “We would highly appreciate any opinions/feedback about our software”.

CLICK HERE for Beta Version of English KABAL Ballistics Software (Web use only)

“Miracle Device” Cuts Groups in Half — Guaranteed

Well, yes, that headline is a come-on. But there’s truth in the promise. The “miracle device” to which we refer is a simple wind indicator.

Remarkably, many shooters who spend $3000.00 or more on a precision rifle don’t bother to set up windflags when they shoot. Whether you’re a competitive shooter, a varminter, or someone who just likes the satisfaction of drilling small groups, a set of windflags is something you should take to the range every time. And yes, if you pay attention to your windflags, you can easily cut your group sizes in half. Here’s proof…

Miss a 5 mph Shift and Double Your Group Size
In the following table we show the effect of a 5 mph crosswind at 100, 200, and 300 yards. You may say to yourself, “well, I’d never miss a 5 mph let-off.” Consider this — if a gentle 2.5 mph breeze switches from 3 o’clock (R to L) to 9 o’clock (L to R), you’ve just missed a 5 mph net change. What will that do to your group? Look at the table below to find out.

Values from Point Blank Ballistics software for 500′ elevation and 70° temperature.

Imagine you have a 6mm rifle that shoots half-MOA consistently in no-wind conditions. What happens if you miss a 5 mph shift (the equivalent of a full reversal of a 2.5 mph crosswind)? Well, if you’re shooting a 68gr flatbase bullet, your shot is going to move about 0.49″ at 100 yards, nearly doubling your group size. With a 105gr VLD, the bullet moves 0.28″ … not as much to be sure, but still enough to ruin a nice small group. What about an AR15, shooting 55-grainers at 3300 fps? Well, if you miss that same 5 mph shift, your low-BC bullet moves 0.68″. That pushes a half-inch group well past an inch. If you had a half-MOA capable AR, now it’s shooting worse than 1 MOA. And, as you might expect, the wind effects at 200 and 300 yards are even more dramatic. If you miss a 5 mph, full-value wind change, your 300-yard group could easily expand by 2.5″ or more.

If you’ve already invested in an accurate rifle with a good barrel, you are “throwing away” accuracy if you shoot without wind flags. You can spend a ton of money on fancy shooting accessories (such as expensive front rests and spotting scopes) but, dollar for dollar, nothing will potentially improve your shooting as much as a good set of windflags, used religiously.

Which Windflag to buy? Click here to view many windflag designs.

Aussie Windflag photo courtesy BenchRestTraining.com (Stuart and Annie Elliot).

New Ballistics Program for I-Pod Touch and I-Phones

Knights Armament has developed a sophisticated yet easy-to-use ballistics program that runs on the Apple I-Pod Touch and Apple I-Phone platforms. The KAC Bullet Flight 2.0.0 software contains all the features you would want, including: user-selectable BC models (G1, G7, G8 etc.); output in inches, cm, MOA, Mils, and scope clicks; 360° wind drift calculation; computation of actual BC from collected data; and built-in accelerometer for angle detection.

In addition, KAC Bullet Flight 2.0.0 comes with a large database of bullet types (including weights, BCs etc.). You can also create your own custom ammo profiles (with velocity, BC, bullet type), allowing you to easily output ballistic plots for multiple firearms, without having to enter the rifle/bullet profile every time.

KAC Bullet Flight 2.0.0 is a very sophisticated program that rivals anything you can run on your home computer. A version of Bullet Flight is already in use with the U.S. Military in Iraq and Afghanistan. The Apple I-Pod touch/I-Phone platform was chosen because this is now the #1 hand-held computing platform in the world. (With the I-Pod Touch, you do NOT need a phone service contract.) Also the Apple operating system and “multi-touch” screen allows an extremely user-friendly, easy-to-operate interface. “Ruggedized” Otterbox carry cases are also available for both first- and second-generation I-pods.

Software Starts at Just $3.99
There are three versions of KAC Bullet Flight, all very affordable. The basic L1 version costs just $3.99. We recommend the L2 version ($11.99) which adds a full calculation screen, the ability to generate a range-card, cosine-angle calculation, and GPS functionality. Finally, the $24.99 Level ‘M’ (Military) version further adds the ability to calculate an actual BC based on bullet drop, two velocities, or flight time. With Level ‘M’ you can also correct for very subtle factors, such as the Coriolis Effects, which come into play at ultra-long ranges.

SCPRC Match Report — 2-Day Comp Truly Challenging

Our “master fabricator” and silhouette guru Mark LaFevers recently attended the SoCal Precision Rifle Competition, Mark’s first-ever tactical match. Competition was fierce at this year’s SCPRC. The match winner, and “top gun” among the 50+ competitors was Sgt. Dan Gilland, (USMC), a scout-sniper from a nearby Marine base. This was only Dan’s second civilian match and yes, the young Marine was shooting a .308 Win (7.62×51 to be precise). Jason Boak took second place while Gordon Campfield finished third. Jason was the top shooter among the NorCal guys, who did well, capturing 6 of the top 10 places, earning California intra-club bragging rights.

Mark told us that the match was a humbling yet very fun experience. In these kind of matches very few, if any, sighters are allowed, and you’re often shooting at unknown distances. Accordingly, it is imperative that you have rock-solid come-ups at all distances, before you arrive at the match. In addition, the SCPRC offered the challenges of angled shooting (requiring ballistic compensation), and lowlight shooting. Log on to the CalGuns.net Forum for a complete match report by NorCal shooter Vu Pham, with lots of photos, plus stage descriptions (match directors take note).

A wide variety of calibers were shot at the match, and Mark observed that no one chambering seemed to have the edge (though a .308 finished on top). However, most of the top shooters were running detachable magazines, and had barrels fitted with muzzle brakes. You can see the dust kicked up from the muzzle brakes in the video below. The first part of the video shows a stage where competitors had to start with standing (off-hand) shots, then transition to a stepped barricade, moving lower and lower as the timer ticked off the seconds. For the standing stages, Mark noted, you wanted a rifle that balanced well and was not too heavy. Some of these beefy tactical rifles, optimized for prone work, are tough to hold offhand.

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