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October 19th, 2016

Lapua Releases FREE Advanced 6DOF Ballistics Mobile APP

Lapua Ballistics App 6DOF degrees of Freedom solver doppler radar bullet BC Apple iOS Android OS mobile smartphone iphone

Lapua, maker of premium brass, bullets, and loaded ammo, has released a new, state-of-the-art Ballistics program that runs on smartphones and mobile devices. The all-new Lapua Ballistics Mobile App is the first mobile ballistics app utilizing the 6DOF calculation model. 6DOF refers to “Six Degrees of Freedom”, referring to the multiple variables the software calculates. As explained below, a 6DOF solver can account for 3 components of movement PLUS 3 components of rotation. Of course, as with other ballistics software, the Lapua Mobile App looks at Bullet BC, velocity, and cross-wind effects. This software can also account for subtle, extreme long range factors such as the Coriolis Effect.

Lapua Ballistics App 6DOF degrees of Freedom solver doppler radar bullet BC Apple iOS Android OS mobile smartphone iphone

CLICK HERE for FREE 28-page Ballistics App USER GUIDE

Notably, the new Lapua Ballistics App includes a library of up-to-date bullet profiles based on extensive field tests with Doppler Radar. Having an ultra-sophisticated 6DOF solver combined with Doppler Radar data makes the Lapua Mobile App one of the most accurate ballistics Apps on the market. Lapua Ballistics offers the latest, Doppler-proven Lapua cartridge and bullet data for you to combine with your firearm and local weather information. The App also includes the option to define custom bullets.

Lapua Ballistics App 6DOF degrees of Freedom solver doppler radar bullet BC Apple iOS Android OS mobile smartphone iphone

The Lapua Ballistics App is available for Android and iOS smart phones and mobile devices free of charge. For more info, visit

Lapua Ballistics App 6DOF degrees of Freedom solver doppler radar bullet BC Apple iOS Android OS mobile smartphone iphone

6DOF, the most accurate calculation method. Lapua cartridge / bullet information. Distance, wind speed and angle. outputs numerical, reticle, table and graph views, metric and imperial values. Set Point Blank-range to different sight-in distances and impact windows. Define custom bullets ( BC G1 or G7 and Siacci method), Pre-set max 4 powder temperature.Sight-in-POI, Coriolis calculation

Permalink Bullets, Brass, Ammo, New Product, Tech Tip No Comments »
May 10th, 2014

Digital Level + Protractor Tool Has Many Uses

Here’s a cool product that can help you level your front rest and rear bag, level your scope, align your target frame, and perform a myriad of tasks around the house. The Digital Angle Cube (aka Electronic Level and Protractor Gauge) is basically a high-tech level that gives you exact angular read-outs to within 0.2 degrees. That’s a lot more precise than any bubble level.

Numerous Shooting-Related Applications
For you position shooters who like to run angled sights, this tool will help you set the rear sight and front tower to exactly the same angle. For High Power guys with 3-way and 4-way adjustable buttstocks, this digital angle gauge can help you quickly and precisely set buttstock angle and cast-off. Even tactical shooters and long-range hunters can use this device to confirm exact shot angle, with greater precision than a plastic protractor or even an expensive Angle Degree Indicator (ADI). Heck you can even use the thing as an anti-cant device (if you don’t mind the extra weight). We’re sure that our clever readers can find even more uses for a digital angle read-out tool.

The Digital Angle Tool sells on for $29.50. It comes with magnets on the sides so you can attach the tool to any ferrous metal surface for a “hands-free” reading. You can find similar devices in hardware and home improvement stores. One of these square, magnet-equipped electronic protractor/levels is made by INSIZE. The illustration below shows how the INSIZE gauge can be used in the field.

Story Sourced by Edlongrange.
Permalink Gear Review, New Product 4 Comments »
September 2nd, 2011

David Rolls and The Slope Doper

By Dr. Jim Clary

Rolls Slope DoperOne cannot discuss one of the most useful tools for long range shooters, The Slope Doper, without saying something about its inventor, David Rolls. David was a bold man, bigger than life, who dedicated his life to the service of others. Yet, he was full of fun and a little mischief. He had little tolerance of fools (a man after my own heart), but had great respect for those who deserved respect. It was a loss to all when he passed away in August 2008 at the young age of 61. That being said let me tell you of how he lived and what he accomplished with The Slope Doper.

David Rolls’ Background
David worked for years with the Baltimore City Fire Department as a firefighter and paramedic, retiring at 45. Not being content to sit around, he applied for a job with the Sheriff’s Department of Mineral County, West Virginia and graduated from the state police academy. No small feat for a man of any age, let alone one in his forties. David rose to the rank of Sergeant and held that rank until his passing. As a firefighter, paramedic and police officer, he was the kind of man you would want if you were in a tight spot. He never backed down when it came to helping others. Throughout his life he was active in the Boy Scouts and community activities. He was a lifetime member of the NRA holding the status of Golden Eagle and Certified Firearms Instructor.

As a shooter, David was intensely interested in tactical competitions and was a member of the American Sniper Association. Long distance tactical shooters are frequently faced with the problem of making adjustments when shooting uphill or downhill, as well as windage and normal bullet drop. Chucks Hawks provided a superb discussion of the effects of uphill/downhill shooting for the hunter. I strongly urge every reader to look up Chuck’s article to better understand the problem.

Even knowing that we will be shooting over our target (or at best higher than our aiming point), most hunters do not know how to make the required adjustments in the field. Something had to be devised that could be used quickly in the field by the average hunter. Enter David P. Rolls!

Slope Doper Debuts in 1998 at Storm Mountain
After a great deal of thought, David showed up at the Carlos N. Hathcock II Charity Sniper Competition at the Storm Mountain Training Center in 1998 with a prototype of his Slope Doper. It was somewhat crude by comparison to the current day production model, consisting of a laminated paper protractor with a weight and string, but it worked. It allowed a shooter to determine the impact point of his bullet when shooting at any angle. David had succeeded in combining the science of mathematics with the practicality required for field use. It should be noted that military shooters have used protractors for years, but they had to subtract numbers to arrive at the correct angle. Dave’s invention placed the zero degree point at the top of the arc, virtually eliminating the possibility of error. Ever the perfectionist, with an eye to the future, he asked his best friend, Fred Fischer to design a “professional” version with AutoCad, which Fred gladly did. Fred also had contacts with a manufacturer who happened to be a shooter and they were off. Fred still chuckles when he remembers all of the last minute changes that Dave came up with, but at least they had the basic artwork locked into the AutoCad program to go into production. The rest is history.

Rolls Slope Doper

The Quantico marine sniper instructor who was the first military member to see a production version of the Slope Doper (and incidentally a member of the two-man team who won the Carlos Hathcock Sniper Competition) was impressed enough by it to remove his personal protractor from his data book and replace it with the Slope Doper David gave him. The Slope Doper is now standard issue with the Marine Corp sniper weapon system; The Slope Doper is packed with each rifle and its accessories. The pointer is easily replaceable with string and a weight if it is lost and the printing on both sides is actually fire resistant. It is mil spec and made to withstand combat conditions. It is aluminum rather than plastic, so that it will not break in cold conditions.

To understand how the Slope Doper works, it is best for me to let David tell you in his own words:

To begin with, you must understand that when you shoot up or downhill, gravity has a diminished effect on your projectile such that if you do not make any adjustment for angle, you will likely shoot over your target. This applies at long distances (greater than 300 yards) at slight angles and at severe angles (greater than 30 degrees) at lesser distances. With slight angles at short distances the adjustment may not be enough to worry about. The Slope Doper is a photo etched, anodized, aluminum plate that has two scales inscribed along an arc. The first scale tells you the angle in degrees, the inner scale gives you the cosine of the angle (what I call the “Slope Angle Factor”) at 10 degree intervals.

To use the Slope Doper, you must first know the range to your target. Next you have your partner (guide) hold the Slope Doper along side the bore centerline of your rifle while you take aim and read the Slope Angle Factor. If you are alone, you can sight your target along the top edge of the Slope Doper and capture the pointer with your thumb and then read the Slope Angle Factor. If you are not at an exact Slope Angle Factor, it is easy to interpolate. Now take the known distance and multiply that by the Slope Angle Factor. The answer you get is the effective range. You should now shoot as if the actual distance is the lesser distance (at 30 degrees, a Slope Angle Factor of 0.87, 500 yards becomes 435 yards). All other environmental factors, like wind, are still in effect at the actual distance (500 yards of wind is still 500 yards of wind).

To make my life easier, I attached some Velcro to the back of my Slope Doper and on the forend of my rifle. After using my rangefinder for distance, I simply point my rifle at the target, capture the pointer with my thumb, read the Slope Angle Factor, make a quick mental calculation and shoot. If you are an experienced shooter with a scope that has a mil dot reticule, the back of the slope doper has your ranging formulas. The Slope Doper is a must-have for every person who hunts in mountainous country, from the Appalachians to the Rockies. It will help prevent you from missing your quarry. It is a bargain when compared to the $300 – $500 we pay for our rangefinders and binoculars. You can purchase the Slope Doper directly from the Slope Doper Website for $24.95 plus $5.00 shipping (PayPal or mail-order). U.S. Tactical Supply also sells the Slope Doper for $24.95.

A final note: I was watching the Outdoor Channel last week and watched a hunter on a ridge shoot over a 6×6 bull elk in the valley below. The elk disappeared, and the show ended with the hunter and guide talking about the thrill of the chase, even though they missed the elk. Good for public relations, but not so good for the freezer. They should have had The Slope Doper!

Permalink Gear Review, Optics 6 Comments »
July 18th, 2009

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.

SoCal Precision Rifle Competition SoCal Precision Rifle Competition

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 Forum for a complete match report by NorCal shooter Vu Pham, with lots of photos, plus stage descriptions (match directors take note).

SoCal Precision Rifle Competition

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.

Please enable Javascript and Flash to view this VideoPress video.

SoCal Precision Rifle

Permalink - Videos, News No Comments »
July 14th, 2009

New Bushnell RangeFinder with Angle Range Compensation

Bushnell has released a new Legend 1200 ARC laser rangefinder (LRF) with a claimed 1,200-yard capability on highly reflective objects. Bushnell claims the Legend 1200 will range a tree out to 850 yards, or a deer-sized animal out to 475 yards.

AccurateShooter Bushnell Laser Rangefinder

A compact 4.3″ x 2.9″ x 1.7″ size, the Legend 1200 weighs just 7.4 ounces. This is small and light enough to carry in a shirt pocket. The Legend 1200 features a multi-coated 6X optic and all external lens surfaces are coated with RainGuard HD. With a $349.00 MSRP, the Legend 1200 is available in black or Realtree® AP™ camouflage.

AccurateShooter Bushnell Laser RangefinderBuilt-In Angle Compensation
The Legend 1200 has a built-in inclinometer so it can give you true horizontal yardage for up-angle and down-angle shots. That is very important for hunters and tactical shooters who must rapidly adjust for shot angle to ensure a hit. In Rifle Mode the Legend 1200 calculates the angle and indicates the holdover required in either inches or MOA (user selectable output). The range of angle measurement is -90 to +90 degrees.

A new feature in the Legend 1200 is Variable Sight-In Distance capability or VSI™. In Rifle Mode, users can select between 100, 150, 200 or 300 yard sight-in distances to accommodate their shooting styles and preferences. Other standard features include SCAN, Bulls Eye and Brush Modes for better targeting and accuracy. The Legend 1200 ARC is rubber armored and fully waterproof. It comes with a carrying case, lanyard and 3-volt CR2 battery.

Permalink New Product, Optics No Comments »
June 28th, 2009

TECH TIP: Keep Your Rifle Level for Better Scores

Experienced marksmen know they should keep their rifles level when shooting. But they may not understand exactly what happens if they allow their rifle to be canted (tilted left or right), even a few degrees. While the physics are complicated to explain, here’s what you need to know: if you cant your rifle to the left, your shots will impact to the left, and lower, than your point of aim. Likewise, if you cant your rifle to the right, your bullets will impact low and right.

Effects of Rifle Canting
The effects of rifle canting are explained in great detail on the Long Shot Products Ltd. website. There, you’ll find a technical discussion of the Physics of Rifle Canting, plus a page with Sample Targets shot with canted rifles.

Referring to the above illustration, the Long Shot Products article explains: “Notice how the trajectory of the vertical hold stays within the vertical plane, so when the projectile drops, it drops into the line of sight and down to the center of the target. The trajectory of the cant hold does not achieve the same height as the trajectory of the vertical hold and the projectile diverges from the line of sight, thereby missing the target.”

The Long-Shot article makes two other important points. First, cant error increases with distance, and second, cant-induced windage errors are worsened by mounting your scope high above the bore axis:

“This component of cant error becomes more significant at more distant targets due to the increased original included angle between the line of sight axis and the bore axis (more elevation compensation) at the vertical hold.”

“Use of large-diameter objective scopes, mounted high off the barrel, exacerbates the cant error problem. To keep the scope elevation knobs centered for maximum adjustment, precision shooters sometimes use elevation-compensated scope mounting rings or bases. Although this solves the adjustment problem, it greatly exaggerates cant error because the distance between the bore axis and the line of sight axis increases and the included angle between the sight axis and the bore is larger, producing more windage error when canting.”

Test Targets Reveal Cant Errors
The Long Shot Products Ltd. website also displays actual Test Targets showing the effects of canting error. These targets were shot with air rifles and rimfire rifles, but the same effects can and will occur with centerfire rifles. Shown below is a target shot at 50 yards with a Feinwerkbau .22LR match rifle using RWS Match ammo (1012 fps MV). As you can see, canting the rifle 20 degrees to the left produced a huge movement of the point of impact. The shots from the canted rifle impacted 1.81″ Left, and 0.6″ below the point of aim.

CLICK HERE to view more Canted Rifle TARGETS.

Permalink - Articles, Optics 1 Comment »