“On that day, let us solemnly remember the sacrifices of all those who fought so valiantly, on the seas, in the air, and on foreign shores, to preserve our heritage of freedom, and let us reconsecrate ourselves to the task of promoting and enduring peace so that their efforts shall not have been in vain.”
– 1954, President Dwight D. Eisenhower, Veterans Day proclamation.
On the 11th hour, of the 11th day, of the 11th month of 1918, bugle calls signaled the ‘cease fire’ ending the First World War. (The official Armistice was signed earlier that morning.) To those who endured it, WWI was the “Great War”, “the War to End All Wars.” Tragically, an even greater conflict consumed the world just two decades later.
Today, 98 years after the end of WWI, Americans mark the anniversary of the WWI Armistice as “Veterans Day”. In Canada it is known as Remembrance Day. On this solemn occasion we honor all those who have served in the military in times of war and peace.
While more WWII veterans pass away each year, there are still over 21.8 million veterans in the United States. Take time today to honor those soldiers, sailors, and airmen who have served their nation with pride. Today we remember that… “All gave some, and some gave all.”
Former Secretary of Veterans Affairs Dr. James Peake asked Americans to recognize the nation’s 21.8 million living veterans and the generations before them who fought to protect freedom and democracy: “While our foremost thoughts are with those in distant war zones today, Veterans Day is an opportunity for Americans to pay their respects to all who answered the nation’s call to military service.”
On Veterans Day we especially need to remember the seriously wounded combat veterans. These men and women summon great courage every day to overcome the lasting injuries they suffered in battle. Some of these soldiers have lost limbs, yet volunteered to return to combat duty. That is dedication beyond measure.
National Veterans Day Ceremony
The Veterans Day National Ceremony is held each year on November 11th at Arlington National Cemetery. The ceremony commences precisely at 11:00 a.m. with a wreath laying at the Tomb of the Unknowns and continues inside the Memorial Amphitheater with a parade of colors by veterans’ organizations. The ceremony is intended to honor and thank all who served in the U.S. Armed Forces. Major regional ceremonies and events are also held throughout the country.
The Coriolis Effect comes into play with extreme long-range shots like this (2100 yards at Raton, NM). The rotation of the earth actually moves the target a small distance (in space) during the long duration of the bullet’s flight.
When you’re out at the range, the Earth seems very stable. But it is actually a big sphere zooming through space while spinning around its axis, one complete turn every 24 hours. The rotation of the earth can create problems for extreme long-range shooters. During extended bullet flight times, the rotation of the planet causes an apparent deflection of the bullet path over very long distances. This is the ballistics manifestation of the Coriolis Effect.
Bryan Litz of Applied Ballistics has produced a short video that explains the Coriolis Effect. Bryan notes that Coriolis is “a very subtle effect. People like to make more of it than it is because it seems mysterious.” In most common shooting situations inside 1K, Coriolis is not important. At 1000 yards, the Effect represents less than one click (for most cartridge types). Even well past 1000 yards, in windy conditions, the Coriolis Effect may well be “lost in the noise”. But in very calm conditions, when shooting at extreme ranges, Bryan says you can benefit from adjusting your ballistics solution for Coriolis.
Bryan explains: “The Coriolis Effect… has to do with the spin of the earth. You are basically shooting from one point to another on a rotating sphere, in an inertial reference frame. The consequence of that is that, if the flight time of the bullet gets significantly long, the bullet can have an apparent drift from its intended target. The amount [of apparent drift] is very small — it depends on your latitude and azimuth of fire on the planet.”
Coriolis is a very subtle effect. With typical bullet BCs and velocities, you must get to at least 1000 yards before Coriolis amounts to even one click. Accordingly, Bryan advises: “Coriolis Effect is NOT something to think about on moving targets, it is NOT something to think about in high, uncertain wind environments because there are variables that are dominating your uncertainty picture, and the Coriolis will distract you more than the correction is worth.”
“Where you could think about Coriolis, and have it be a major impact on your hit percentage, is if you are shooting at extended range, at relatively small targets, in low-wind conditions. Where you know your muzzle velocity and BC very well, [and there are] pristine conditions, that’s where you’re going to see Coriolis creep in. You’ll receive more refinement and accuracy in your ballistics solutions if you account for Coriolis on those types of shots. But in most practical long-range shooting situations, Coriolis is NOT important. What IS important is to understand is when you should think about it and when you shouldn’t, i.e. when applying it will matter and when it won’t.”
The Coriolis Effect — General Physics
The Coriolis Effect is the apparent deflection of moving objects when the motion is described relative to a rotating reference frame. The Coriolis force acts in a direction perpendicular to the rotation axis and to the velocity of the body in the rotating frame and is proportional to the object’s speed in the rotating frame.
A commonly encountered rotating reference frame is the Earth. The Coriolis effect is caused by the rotation of the Earth and the inertia of the mass experiencing the effect. Because the Earth completes only one rotation per day, the Coriolis force is quite small, and its effects generally become noticeable only for motions occurring over large distances and long periods of time. This force causes moving objects on the surface of the Earth to be deflected to the right (with respect to the direction of travel) in the Northern Hemisphere and to the left in the Southern Hemisphere. The horizontal deflection effect is greater near the poles and smallest at the equator, since the rate of change in the diameter of the circles of latitude when travelling north or south, increases the closer the object is to the poles. (Source: Wikipedia)
Jeffrey Block has created a great FREE software program, OnTarget, that measures shot groups quickly and precisely. All you need is a photo or scan of your target. The program allows you to set your target distance, and provides caliber-specific tools to precisely mark the center of each shot. Once you’ve marked each bullet hole, Jeff’s OnTarget program automatically calculates group center, maximum group spread (CTC), average distance to center, group width and height, and group offset from point of aim. The program will even measure multiple groups on the same target.
Video Tutorial Shows How OnTarget Software Works
Jeff created an excellent Animated Tutorial demonstrating OnTarget’s functions. It shows how to import a target image or scan, how to set target distance and scale, how to set bullet size, how to circle each bullet hole, and how to save the marked and measured target. VIEW OnTarget TUTORIAL.
After just a few minutes spent learning the program’s tool buttons, we were able to plot shot groups on a variety of targets with ease. Once you select the target distance and bullet diameter, figuring group size is a simple matter of centering a circle tool over each bullet hole. Then the program “connects the dots” and provides all the info you could want automatically.
The program worked with bullet holes as small as 17 caliber and as large as 50 caliber. It is very precise, but remember that if your target photo was taken at an angle, distorted perspective can cause slight errors in measurement. Therefore, for the ultimate precision, you want to start with a flat scan of the target.
OnTarget Compared to Measuring Manually
We found OnTarget to be especially useful for groups with widely dispersed bullet holes, or very small bullet holes, such as 17 caliber holes. We’ve found that it’s difficult to measure 17-cal group sizes with a standard caliper, because the tool itself obscures the tiny holes. With OnTarget, the program can zoom up your target view, making it much easier to plot the center of each shot. And with a widely dispersed group of shots, the program automatically finds the two most distant shots. You can’t mistakenly pick the wrong pair of shots to measure.
MEASURING REAL TARGETS — Actual Examples
Here are examples we created with OnTarget. The first photo shows a 17 Mach 2 target. These tiny 17-cal holes are notoriously hard to measure. With OnTarget, it’s a snap. You just load the target image into the program, zoom in with the controls, and then click on the center of the holes. The program automatically calculates group size, displaying measurements in both inches and minutes of angle (MOA)
Original Target (with ruler for scale)
Target Captured and Displayed in Program
Detail of Group, Enlarged by Program
10-shot Groups? — No Problem
Here’s another target, showing 6mm bullet holes at 600 yards. The first image shows the target image loaded into the program with the ten holes circled in red.
Target Displayed in Program
For this target we have used the Aiming Point option. The Aim Point was set at the center of the “X” and the program calculates average distance from the Aim Point. Very cool.
Detail of 10-Shot Group, Enlarged by Program
No Scanner Needed
The OnTarget program grabs target scans directly from a flatbed scanner using Microsoft’s Windows Image Acquisition system. But don’t worry if you don’t have a scanner. You can just take a digital photo of your target and OnTarget will import it quickly and easily. To set target scale, a simple tool allows you to mark a known length on the target (such as the diameter of the “X” Ring), and the program will then size the target accordingly. Is OnTarget precise and accurate? Here’s what Forum Member Steve W. says: “I used the extreme spread measurement of a group on one of my 600-yard match targets… as it was officially scored at the match. By clicking the +—+ icon, then clicked the cursor in the centers of the two extreme spread holes, I then entered that value in the reference window. After that it was simple because the bullet placement cursor’s circle was the same size as the black outline of the actual bullet holes on the picture of the target. OnTarget’s measurement came up within .006″ of the official 2.772 inch measurement of the group. That’s pretty darned close; well inside the human judgment of aligning the tips of a micrometer on the bullet holes.”
Bottom Line — Great Program — Download It Today
Jeffrey Block has done a great service for shooters by creating the FREE OnTarget program. It is easy to learn, it functions great, and it can save you time and effort measuring targets. It also lets you easily archive and compare multiple targets produced during load development or rifle testing. You can record ammo type, date, location, weather etc. in note fields accessed by “Group Info” and “Target Info” tabs.
Keep in mind that OnTarget was NOT created to replace existing methods for scoring competition targets. But for all other target measuring purposes it does a great job. Visit Jeff’s website, OnTargetShooting.com, view the tutorial, and check out OnTarget for yourselves.
To learn more about OnTarget, see more measuring samples, and read advanced Power-User Tips, visit our full OnTarget Product Review.
What is Parallax?
Parallax is the apparent movement of the scope’s reticle (cross-hairs) in relation to the target as the shooter moves his eye across the exit pupil of the riflescope. This is caused by the target and the reticle being located in different focal planes.
Why is it Important?
The greater the distance to the target and magnification of the optic, the greater the parallax error becomes. Especially at longer distances, significant sighting error can result if parallax is not removed.
How to Remove Parallax
This Nightforce Tech Tip video quickly shows how to remove parallax on your riflescope.
While keeping the rifle still and looking through the riflescope, a slight nod of the head up and down will quickly determine if parallax is present. To remove parallax, start with the adjustment mechanism on infinity and rotate until the reticle remains stationary in relation to the target regardless of head movement. If parallax has been eliminated, the reticle will remain stationary in relation to the target regardless of eye placement behind the optic.
This Parallax Discussion first appeared in the Nightforce Newsletter. To get other helpful Tech Tips delivered to your mailbox, CLICK HERE to open the Nightforce Newsletter sign-up page.
For a prone shooter, particularly on dusty, dirty or sandy ground, muzzle blast is a major bummer. Muzzle blast can be very disturbing — not just for the trigger-puller but for persons on either side of the gun as well. Some muzzle brakes send a huge shockwave back towards the shooter, and others send blast towards the ground, kicking dirt and debris into the prone shooter’s face. If there was a way to illustrate those factors — shockwave and debris — that might help shooters select one brake design over another.
Cal Zant at PrecisionRifleBlog.com applied a unique blend of creativity and resourcefulness to try to answer that question for 20+ muzzle brakes. Using high-speed photography and household products, he captured the blast pattern of 20+ different brake designs for easy side-by-side comparison. Can you figure out how Cal managed to show muzzle brake blasts so clearly? His “hi-viz” solution, revealed in the article, is very clever. See the eye-opening results for 20+ brakes, with illustrative photos, by visiting the Precision Rifle Blog Muzzle Brake Ground Signature Test Page.
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We’ve learned that many first-time visitors to AccurateShooter.com may come in via a link to the Daily Bulletin rather than through our home page. As a result, they may not be aware that there is a wealth of other content available to our readers. Our Shooters’ Forum, with nearly 33,000 registered members, is one of the best places on the web to discuss precision shooting and advanced reloading. We also offer FREE Forum Classifieds. On the editorial side, AccurateShooter.com offers hundreds of pages of content, with thousands of photos. Our Cartridge Guides are definitive one-stop resources for popular match calibers, while our Guns of the Week articles spotlight outstanding custom rifles, most with competition pedigrees. In addition, we offer videos, gear reviews, book reviews, gunsmithing tips, and even FREE downloadable targets.
If you’re a new visitor to AccurateShooter.com, you should check out all that we have to offer. There are hundreds of informative articles to read … and they’re all FREE.
Here’s something truly innovative — a 3D-printed metal rimfire receiver!
Forum member Marcos G. (aka MFP_BOP) has designed and created his own rimfire action. But it’s not machined or forged. This new action was created with a 3D sintered metal printer. A 3D modeler by profession, Marcos has the requisite skill set and access to a very high-tech (and expensive) metal printer. As printed, the actual receiver is shown below. It has just been sent out to be age-hardened to 40 HRC, after which final finish work (e.g. cleaning up tenon threads) will be done. To learn more about this 3D-printing project, read this FORUM Thread.
When most of us think of 3D printing, we think of small plastic parts — nothing as strong as steel. But there are 3D printers that employ sintered metal to build complex metal components. Marcus says the receiver he’s created should have “stated yield and tensile strength similar to investment casting.” The material used for the action is 15-5 PH® Stainless Steel (in sintered form).
The action was designed to use a PT&G 40X rimfire bolt. Marcos notes that “There is an extraction cam inside of the action, something that would be very hard or impossible to do by regular machining and/or EDM.”
Born in Brazil, Marcos now lives in New Zealand. He tell us that: “New Zealand is a very gun-friendly country. I just need my A-CAT license to make [a receiver.]” So there are no special legal restrictions (as might apply in the USA). The printer is EOS270 laser metal sintering machine. Marcos says: “The current price for one of those machines is in five figures, but I am 99.99% sure that in 5-7 years this technology will be readily available to anyone.”
As designed, the receiver was 1.4″ in diameter. Marcos reports it came out of the printer at 1.403″. The designed boltway is .690″ and it came out .687″. Marcos notes: “I haven’t noticed any warping. The threads are rough, really! Interior and exterior finishes are really good though, probably because of the way it’s been printed: upside down (must have gone through tumbling afterwards). I will have to run some taps and single-point-cut the tenon threads to clean them up.”
Marcos says the actual printing process took a lot of time: “I should have asked how long it took to be printed!” But consider this, the 7″-long receiver is created in layers only 20 microns thick, so you can understand why the process took so long.
Reasons to Print a Rimfire Receiver
Marcos 3D-printed his own action basically to save money: “Some may be asking why I printed this receiver. Here’s a little history… I tried different ways to bring a Stiller 2500X action into New Zealand. The final price to my door was NZ $3000.00 (about $2195.00 USD). Designing and making one would be way cheaper, but I felt nobody here could machine the internal abutments with precision. Also printing was still a little cheaper and printing offered the chance to put in it all details I wanted — such as M4 threads, internal cam, and fillets.”
This summer, our friend Dennis Santiago made his first-ever pilgrimage to Camp Perry, Ohio to compete in the National Matches. He recounts his experience in a fascinating, informative, and often humorous story on his Dennis Talks Guns Blog. When you have a few moments to spare, you should definitely read Santiago’s account of his First Time at Camp Perry. This is much, much more than a match report. Dennis gives insights into the human side of the experience — and the little things that make Camp Perry so special. CLICK HERE to Read Full Camp Perry Story.
Dennis competed in a number of events during his two-week stay. Shooting “classic” service rifle and his new scoped, “modern AR” service rifle Dennis competed solo (in Presidents 100 and NTI matches among others) and also as a member of the California Adult Team in the 4-man NTT match.
Santiago’s First Time at Camp Perry report is a “must-read” for anyone contemplating a Camp Perry visit. Here are some highlights — but honestly folks, do read the entire story — it’s well worth it.
First Time at Camp Perry, by Dennis Santiago
Perry Ain’t Like Home
Iron Sights and “Perry-Vision”
This range is kicking me hard. I tell people about how hard I was pushing my eye into my aperture. They smile that “welcome to Camp Perry” smile again. They ask what sights I’m shooting on my A2 and I tell them I’ve got an 0.050″ front and 0.038″ rear to maximize depth of field. They smile more broadly and tell me my problem is that I’m from the Western provinces where the sun is bright and the ground is devoid of flora. Lots of light. It’s green here and we have clouds I’m told. Not nearly the same ambient lighting. You have the wrong sights my son. Where the green grass grows you want a big fat 0.072″ front the size of an aircraft carrier deck and a huge 0.046″ hole in the morning and maybe close it down to an 0.042″ rear aperture later if the sun comes out. But that desert glare sight system of yours will lose you about 5-8 points in these parts. Well there you go. Learn something every day.
Baptism at Camp Perry
One’s first visit to Camp Perry is a series of baptismal rites. I shall now enumerate them…
Walk the Base. Do not drive around. Get used to walking. Walk from your hut to everything. Walk to the administration buildings. Walk to the ranges. Walk to commercial row. Walk to the CMP North Store. Walk to the CMP or Army trailer to have the triggers of your rifles(s) weighed. Walk. This is your primary mode of transportation while on base for the next couple of weeks.
Go Shopping. It’s called Commercial Row. It is the best shopping mall for competitive shooters ever. The sale prices here are Black Friday quality. You stock up on supplies. You can buy elusive powders in quantity with the same lot number. Same with bullets and primers. Everything you need to keep making your pet loads. Oddly, not cases. This is a service rifle tournament. Pretty much everyone is using LC or WCC cases. I stocked up. Then I began politely watching my expected cubic feet and gross weight capacity for the drive home as other people asked if I could take stuff back for them instead of shipping their loot.
Learn about the Perils of Perry. One, evacuate the range. It rains at Camp Perry. Sometimes that rain comes with lightning. When that happens range controls issues an evacuation order. Depending on where you are and how much time you have, you either grab your stuff and make for a sheltered structure or leave your stuff under whatever rain cover you have and leave it there until the storm cell passes. This happened on squadded practice day. There was no squadded practice. There was learning to make a better rain cover for the next two weeks because it’d probably happened again. I was particularly proud of my final design which involved a very large tarp and many bungee cords. Modern art to be sure. I received many compliments.
Peril Two — Cease fire, boat in the impact area. One has not truly been to Camp Perry until your shooting string is put on hold while range control sends someone out to tell an errant yacht or jet ski that it’s not a good idea to go into that area with all the buoys with the signs on them that say, Danger. Live Fire. Keep Out.
Shooting Gear
I brought two rifles with me to Camp Perry. The first was my iron sights-configured AR-15. Being my very first trip to the Nationals, I wanted to check off a bucket list item to shoot irons at a National Match. The gun has a Geiselle trigger and an upper I assembled from White Oak Armament parts. The barrel is a Krieger that had 3,800 rounds arriving at Perry. The sights are pinned 1/4×1/4s. I run Sierra 77gr SMKs short line and 80gr SMKs seated .015″ off the lands Long Line with it.
The other rifle I brought was for NRA week. It’s a 2016 Rule Service Rifle, Optic. It has a collapsible UBR stock and a Geiselle Mk VII quad rail. The barrel is an older DPMS .223 that was cryo-treated back in the day. Round count on arrival at Nationals was around 1,800. Same ammunition combination [as the iron sights rifle]. The chamber on this barrel has a shorter throat so I brought a Lee Hand Press with an RCBS competition seater die to set the 80gr SMKs back to proper jump for NRA week. The sighting system for this gun was one of the very new Nightforce 4.5X Competition SR’s with the CMP R223 reticle. Parallax is set to 200 yards. It’s mounted using Nightforce’s superbly engineered AR-15 service rifle Unimount.
Members of the State of California Teams at Camp Perry. Dennis is front row left.
Coaching — When It All Comes Together, at Last
I coached one of the California teams in the NTIT Rattle Battle match. This was the day I finally began to be comfortable at Camp Perry. Walking up and down the field, first as a verifier and then as a coach, I felt back in the game. At team matches you get to confer with your teammates comparing wind calls and observing the effects of their calls as the shooting members of their squads send rounds downrange. You watch the traces of bullets arcing in the air going left or right of the bull’s center depending whether or not the call was right. This process was cathartic. I began to remember that I really can read a range once I get the hang of it.
Readers who have just recently discovered the Daily Bulletin may not realize that AccurateShooter.com has hundreds of reference articles in our archives. These authoritative articles are divided into mutiple categories, so you can easily view stories by topic (such as competition, tactical, rimfire, optics, shooting skills etc.). One of the most popular categories is our Technical Articles Collection. On a handy index page (with thumbnails for every story), you’ll find over 120 articles covering technical and gunsmithing topics. These articles can help you with major projects (such as stock painting), and they can also help you build more accurate ammo. Here are five popular selections from our Technical Articles archive.
Stress-Free Pillar Bedding. Richard Franklin explains how to do a top-quality bedding job, start to finish.
OnTarget Software Review. Our Editors test free software that measures shot groups with great precision. We explain how to use the program and configure advanced features.
Savage Action Tuning. Top F-TR shooter Stan Pate explains how to enhance the performance of your Savage rifle by optimizing the torque settings of the action screws.
Complete Precision Case Prep. Jake Gottfredson covers the complete case prep process, including brass weight sorting, case trimming, primer pocket uniforming, neck-sizing, and, case-neck turning.
Stock Painting Instructions. Step-by-step guide for stock painting by expert Mike Ricklefs. Mike shows both simple coverage and fancy effects.
John Whidden of Whidden Gunworks used the .243 Winchester cartridge to win the 2016 NRA Long Range Championship, his fourth LR title at Camp Perry. John selected the .243 Win because it offers excellent ballistics with manageable recoil. John says that, at least for a sling shooter, the .243 Win is hard to beat at long range. Yes, John says, you can get somewhat better ballistics with a .284 Win or .300 WSM, but you’ll pay a heavy price in increased recoil.
.243 Winchester — The Forgotten 6mm Cartridge for Long Range
by John Whidden, 2016 National Long Range Champion
My experience with the .243 cartridge for use as a Long Range High Power cartridge dates back about 10 years or so. After building a .300 WSM, I realized that the recoil was hurting the quality of my shots. The WSM shot great, but I couldn’t always execute good shots when shooting it. From here I built a 6.5-284, and it shot well. I also had a very accurate 6mmBR at the time, and my logic in going to the .243 Win was to get wind performance equal to the 6.5-284 with recoil similar to the 6mmBR. The experiment has worked out well indeed!
Championship-Winning Load: Berger Bullets, Lapua Brass, and Vihtavuori N160
For a load, currently I’m shooting Lapua brass, PMC primers (Russian, similar to Wolf), VihtaVuori N160 single-base powder, and Berger 105 grain Hybrid bullets. I switched to the Hybrid bullets fairly recently at the beginning of the 2015 season. Previously I shot the 105gr Berger hunting VLDs, and in testing I found that the Hybrids were just as accurate without having to seat the bullet into the lands. The velocity of this combination when shot through the excellent Bartlein 5R barrels (32” length) is around 3275 FPS.
For my match ammo, I seat the Berger 105 Hybrids well off the lands — my bullets are “jumping” from .035″-.060″. I only use one seating depth for ammunition for multiple guns (I know some benchrest shooters will stop reading right here!) and the bullets jump further in the worn barrels than in the fresh barrels. The bullets are pointed up in our Bullet Pointing Die System and are moly-coated. The moly (molybdenum disulfide) does extend the cleaning interval a little bit, probably 20% or so. The Lapua .243 Win brass is all neck-turned to .0125″ thickness.
Whidden’s .243 Win Ammo is Loaded on a Dillon
My loading process is different than many people expect. I load my ammo on a Dillon 650 progressive press using our own Whidden Gunworks dies. However powder charges are individually weighed with a stand-alone automated scale/trickler system from AutoTrickler.com (see below). Employing a high-end force restoration scale, this micro-processor controlled system offers single-kernel precision. The weighed charges are then dropped into the cases with a funnel mounted to the Dillon head.
The Lapua .243 Win brass is full-length sized every time, and I run one of our custom-sized expanders in my sizer die. The expander measures .243″ which yields the desired .001″ neck tension. In my experience, the best way to get consistent neck tension is to run an expander in the case neck at some point. When sizing the case neck by a minimal amount such as is the case here, I don’t find any negative points in using an expander in the sizer die.
In my experience, the keys to accurate long range ammo are top quality bullets and the most consistent neck tension you can produce. From these starting points, the use of quality components and accurate powder measurement will finish out the magic.
Great Ballistics with 6mm 105s at 3275 FPS
Running at an impressive 3275 FPS, Berger 6mm 105 grain Hybrids deliver ballistics that are hard to beat, according to John Whidden:
“My .243 Win shoots inside a 6.5-284 with 142-grainers. Nothing out there is really ahead of [the .243], in 1000-yard ballistics unless you get into the short magnums or .284s and those carry a very significant recoil penalty. In the past I did shoot the 6.5-284. I went to the .243 Win because it had similar ballistics but had much less recoil. It doesn’t beat me up as much and is not as fatiguing.
With the .243 Win, there’s no tensing-up, no anticipating. With the reduced recoil (compared to a 7mm or big .308), I can break and shoot very good quality shots. I find I just shoot better shots with the .243 than I ever did with the 6.5-284.”
When you’re out at the range, the Earth seems very stable. But it is actually a big sphere zooming through space while spinning around its axis, one complete turn every 24 hours. The rotation of the earth can create problems for extreme long-range shooters. During extended bullet flight times, the rotation of the planet causes an apparent deflection of the bullet path over very long distances. This is the ballistics manifestation of the 
After just a few minutes spent learning the program’s tool buttons, we were able to plot shot groups on a variety of targets with ease. Once you select the target distance and bullet diameter, figuring group size is a simple matter of centering a circle tool over each bullet hole. Then the program “connects the dots” and provides all the info you could want automatically.
