December 2nd, 2016

Firearms Barrel Length and Overall Length — Know the Law

The Legal Brief is a feature of TheGuncollective.com that focuses on firearms rules and regulations. In this Legal Brief video, Attorney Adam Kraut explains key State and Federal regulations governing firearms, and explains how to ensure compliance with all applicable laws.

This five-minute video explains barrel length rules for rifles and shotguns, and also explains the best (and most fool-proof) methods to measure your barrel. In addition, the video explains how to measure firearm overall length. A rifle or shotgun which is less than 26 inches overall can also be classified as a “Short-barreled” rifle/shotgun subject to the NFA. NOTE: Under federal law “If the rifle or shotgun has a collapsible stock, the overall length is measured with the stock EXTENDED”.

short barrel barreled rifle shotgun NSA tax stamp ATF legal brief guncollective.com

Highlights of LEGAL BRIEF Discussion of Barrel Length and Firearm Overall Length

The ATF procedure to measure the length of a barrel is to measure from the closed bolt or breech face to the furthest end of the barrel or permanently attached muzzle device. ATF considers a muzzle device that has been permanently attached to be part of the barrel and therefore counts towards the length.

How to Measure Barrel Length: Drop [a] dowel or rod into the barrel until it touches the bolt or breech face, which has to be closed. Mark the outside of the rod at the end of the muzzle crown (if you don’t have a permanently attached muzzle device) or at the end of the muzzle device if it is permanently attached. Remove the rod and measure from the mark to the end of the rod. That is your barrel length[.]

Remember, if the barrel length is less than 16 inches, it is possible that the firearm could be a short barrel rifle (if you are building a rifle or it is already on a rifle) and if the barrel length is less than 18 inches, it is possible the firearm could be a short barrel shotgun (again if you are building a shotgun or it is already a shotgun). Both of these firearms would be subject to the purview of the National Firearms Act and would require the firearm to be registered accordingly.

How to Measure Overall Length:The overall length of your rifle or shotgun may also classify it as a Short Barrel Rifle or Short Barrel Shotgun. The overall length of a firearm is the distance between the muzzle of the barrel and the rearmost portion of the weapon measured on a line parallel to the axis of the bore. … If the rifle has a permanently attached muzzle device, that is part of the overall length. … If the rifle or shotgun has a collapsible stock, the overall length is measured with the stock extended.

READ FULL ARTICLE on Ammoland.com.

Links for this episode:

ATF Method for Measuring Barrel Length and Overall Length:
https://www.atf.gov/firearms/docs/atf-national-firearms-act-handbook-chapter-2/download
Firearm – 26 USC § 5845: https://www.law.cornell.edu/uscode/text/26/5845
Firearm – 27 CFR § 479.11: https://www.law.cornell.edu/cfr/text/27/479.11
Short Barrel Rifle – 18 USC § 921(a)(8): https://www.law.cornell.edu/uscode/text/18/921
Short Barrel Rifle – 27 CFR § 478.11: https://www.law.cornell.edu/cfr/text/27/478.11
Short Barrel Shotgun – 18 USC § 921(a)(6): https://www.law.cornell.edu/uscode/text/18/921
Short Barrel Shotgun – 27 CFR § 478.11: https://www.law.cornell.edu/cfr/text/27/478.11

Permalink - Articles, Gunsmithing No Comments »
November 28th, 2016

Wind-Reading Tips from Champion Shooters

Shooting Sports USA

The digital archives of Shooting Sports USA magazine (SSUSA) features an Expert Forum on Wind Reading. This outstanding article on wind reading starts off with a section by ballistics guru Bryan Litz, author of Applied Ballistics for Long-Range Shooting. Then four of the greatest American shooters in history share their personal wind wisdom. Lanny Basham (Olympic Gold Medalist, author, Winning in the Wind), Nancy Tompkins (Past National HP Champion, author, Prone and Long-Range Rifle Shooting), David Tubb (11-Time Camp Perry National Champion), and Lones Wigger (Olympic Hall of Fame) all offer practical wind-reading lessons learned during their shooting careers.

CLICK HERE for Full Article in Shooting Sports USA Archive

CLICK HERE to Download Article Issue in Printable PDF Format.

Whether you shoot paper at Perry or prairie dogs in the Dakotas, this is a certified “must-read” resource on reading the wind. Here is a sample selection from the article:

Shooting Sports USA



Visit www.SSUSA.org

Shooting Sports USA magazine (SSUSA) has a modern, mobile-friendly website with tons of great content. Log on to www.ssusa.org. There you’ll find current news stories as well as popular articles from the SSUSA archives. The SSUSA website also includes match reports, gear reviews, reloading advice, plus expert marksmanship tips from the USAMU.

Permalink - Articles, Shooting Skills 3 Comments »
November 27th, 2016

Pistol Fundamentals Explained — Infographic and Video

pistol fundamentals NRA marksmanship sight alignment
Photo courtesy St. Bernard Indoor Shooting Center.

Do you enjoy shooting pistols for sport, or perhaps you carry a handgun for self-defense? If you’re like most of us, you might benefit from a “refresher course” on the fundamentals of handgun shooting. The NRA has created a useful Infographic that covers important basics of handgun marksmanship — key things such as Sight Alignment and Trigger Control. Here are the first two (2) lessons. Click the link below to see all SIX (6) training topics: Sight Alignment, Sight Focus, Trigger Control, Breath Control, Hold Control, and Follow-Through.

CLICK HERE for FULL INFOGRAPHIC with SIX LESSONS

pistol fundamentals NRA marksmanship sight alignment

VIEW ALL Six Handgun Fundamentals

Video Shows Sight Alignment, Grip, Stance, Trigger Control and More
In this USAMU video, SGT Shane Coley talks about the basics of sight alignment and trigger control. But then SGT Coley talks about other important control factors such as grip, arm position, and body stance. For rapid-fire shooting, you need to have a good arm and body positioning to control recoil and get back on target quickly. This video is a valuable complement to the NRA Infographic because it demonstrates all the important pistol fundamentals during live fire, at the range.

Permalink - Articles, - Videos, Handguns No Comments »
November 24th, 2016

Learn How the Human Ear Works — And Protect Your Hearing

hearing protectionAll shooters, even rimfire enthusiasts, should always wear ear protection when at the range. A typical rifle gunshot is very loud — in the region of 140 to 170 decibels (the pain threshold is 130-140 db). Without ear protection, you can permanently damage your hearing during a single shooting session. We all know older shooters who are partially deaf, or who suffer from Tinnitus, because they didn’t use earplugs or muffs when they were younger.

How Humans Hear Sounds — Amazing Video Reveals All
The human sense of hearing involves multiple delicate internal membranes, bones, organs, and nerves. Shooters understand the importance of protecting their hearing, but they may not understand the bio-mechanics of human hearing. We hear sounds through Auditory Transduction. Sound waves vibrate the ear drum (tympanic membrane), but that is only the beginning. These vibrations are passed along via tiny rocker-arm-like bones to be “processed” in a spiral chamber, the cochlea. Vibrations moving through the cochlea are separated into frequencies and then sent as neural messages to the brain. It is an astonishingly complex process, one that truly seems miraculous when you examine the bio-engineering involved. In the Video below, the process of human Auditory Transduction is explained and illustrated with 3D animation. You really should watch this amazing video. By the end you will have a new-found appreciation for your ability to hear.

This remarkable VIDEO explains how humans hear sounds. We strongly recommend you take the time to watch and learn. The hearing you save may be your own!

Ear diagram courtesy Siemens Medical Solutions.

Permalink - Articles, Tech Tip No Comments »
November 15th, 2016

Altitude, Air Pressure and Ballistics — What You Need to Know

Trajectory of Bullet fired at Sea Level

Trajectory of Bullet fired at 20,000 feet

You can do your own experimental calculations using JBM Online Ballistics (free to use). Here is an extreme example, with two printouts (generated with Point Blank software), 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.

Suunto AltimeterOne 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 member Milanuk explains 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.

Note that 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.

It’s important to remember 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 Kestrel, or remember to mentally correct the radio station’s pressure, by 1″ per 1,000 feet.”

If you want to learn more about all aspects of External Ballistics, ExteriorBallistics.com provides a variety of useful resources. In particular, on that site, Section 3.1 of the Sierra Manual is reprinted, covering Effects of Altitude and Atmospheric Pressure on bullet flight.

Permalink - Articles, Bullets, Brass, Ammo No Comments »
November 13th, 2016

How and Why to Reload at the Range

Glen Zediker Reloading at Range

Glen Zediker Reloading at RangeThe February 2013 edition of Shooting Sports USA magazine has an interesting feature by Glen Zediker. In this Transporting Success, Part I article, Zediker explains the advantages of loading at the range when your are developing new loads or tuning existing loads. Glen, the author of the popular Handloading for Competition book, discusses the gear you’ll need to bring and he explains his load development procedure. In discussing reloading at the range, Glen focuses on throwing powder and seating bullets, because he normally brings enough sized-and-primed brass to the range with him, so he doesn’t need to de-prime, re-size, and then re-prime his cases.

Zediker writes: “Testing at the range provides the opportunity to be thorough and flexible. You also have the opportunity to do more testing under more similar conditions and, therefore, get results that are more telling. Once you are there, you can stay there until you get the results you want. No more waiting until next time.”

Zediker starts with three-shot groups: “I usually load and fire three samples [with] a new combination. I’ll then increase propellant charge… based on the results of those three rounds, and try three more. I know that three rounds is hardly a test, but if it looks bad on that few, it’s not going to get any better.”

Glen reminds readers to record their data: “Probably the most important piece of equipment is your notebook! No kidding. Write it down. Write it all down.

RCBS Partner PressThere’s More to the Story…

Editor’s Note: In Zediker’s discussion of loading at the range, he only talks about throwing powder and seating bullets. In fact, Glen opines that: “there is little or no need for sizing.” Well, maybe. Presumably, for each subsequent load series, Zediker uses fresh brass that he has previously sized and primed. Thus he doesn’t need to de-prime or resize anything.

That’s one way to develop loads, but it may be more efficient to de-prime, re-size, and load the same cases. That way you don’t need to bring 50, 80, or even 100 primed-and-sized cases to the range. If you plan to reload your fired cases, you’ll need a system for de-priming (and re-priming) the brass, and either neck-sizing or full-length sizing (as you prefer). An arbor press can handle neck-sizing. But if you plan to do full-length sizing, you’ll need to bring a press that can handle case-sizing chores. Such a press need not be large or heavy. Many benchresters use the small but sturdy RCBS Partner Press, on sale now at Amazon for $65.99. You may even get by with the more basic Lee Precision Compact Reloading Press, shown in Zediker’s article. This little Lee press, Lee product #90045, retails for under $35.00.

Glen Zediker Reloading at Range

Permalink - Articles, Reloading No Comments »
November 13th, 2016

Ten Great Hunting Books

Favorite Hunting books Hemingway Roosevelt Leopold Hunter Amazon.com

Recommended Books about Hunting
There’s no shortage of good hunting-related reading material. Here are some of the best books written about hunting. You can find all these titles on Amazon.com. Many are offered in eBook format as well as printed versions. Click on the link(s) below to preview a sample from each book.



Favorite Hunting books Hemingway Roosevelt Leopold Hunter Amazon.comHemingway on Hunting by Ernest Hemingway.

A Sand County Almanac by Aldo Leopold.

Beyond Fair Chase: The Ethic and Tradition of Hunting by Jim Posewitz.

Meditations on Hunting by Jose Ortega y Gasset.

Ranch Life and the Hunting Trail by Theodore Roosevelt (illustrations by Frederic Remington).

Greatest Hunting Stories Ever Told by Lamar Underwood (Editor).

It’s Only Slow Food Until You Try to Eat It by Bill Heavey.

The Beginner’s Guide to Hunting Deer for Food by Jackson Landers.

American Hunter: How Legendary Hunters Shaped America by Willie Robertson and William Doyle.

Whitetail Nation: My Season in Pursuit of the Monster Buck by Peter Bodo.

Permalink - Articles, Hunting/Varminting 3 Comments »
November 11th, 2016

Honor All Who Served on This Veterans Day

Memorial Veterans Day Vet Army Navy Marines WWII

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.

Memorial Veterans Day Vet Army Navy Marines WWII

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.

CLICK HERE for List of Regional Veterans Day Ceremonies.

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.

Permalink - Articles, News 1 Comment »
November 7th, 2016

Extreme Long Range: Understanding the Coriolis Effect

Whittington Coriolis Effect
Photo by Dustin Ellermann at Whittington Center Range.

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.

Coriolis Effect Bryan Litz Applied BallisticsWhen 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 Effect Bryan Litz Applied Ballistics

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)

Permalink - Articles, - Videos, Tech Tip No Comments »
October 31st, 2016

The Mother of All Rimfire Ammo Tests — AccurateReloading.com

rimfire ammunition test

We first featured this story in 2010, but the results of this rimfire ammo test have been of such widespread interest that we try to bring the test to readers’ attention every year.

In 2010, the staff of AccurateReloading.com Forum completed a massive .22LR Rimfire Ammunition Testing Project. Some 55 different types of ammo were tested, using a highly-accurate Swiss-made Bleiker rifle, with a 2-stage trigger. All ammo varieties were tested at 50 yards, 75 yards, and 100 yards, shooting five, 5-shot groups at each distance. Though these tests were completed some time ago, many readers have requested a “reprint” of the ammo rankings, so we’ve republished this data below.

The results are fascinating to say the least (and perhaps eye-opening). The tester observed: “I got some amazing groups, and some which are, frankly, absurdly bad! This has re-enforced what I had experienced with 22 ammo in the past — that is being consistently inconsistent.”

While we strongly caution that .22LR rimfire ammo may work well in one gun and not another, and ammo performance can be improved through the use of barrel tuners, the AccurateReloading.com research provides invaluable guidance for smallbore shooters. Overall, the testers burned through over 4,000 rounds of ammo, and you can see the actual test targets online. To read all the test reports, and view target photos visit AccurateReloading.com.

Bleiker .22LR Rifle

The lists below rank the average accuracy (by brand) of five, 5-shot groups shot at 50, 75, and 100 yards. CLICK HERE for Complete Test Results with target photos.

50-Yard Results 75-Yard Results 100-Yard Results
0.162 Eley Tenex Ultimate EPS
0.164 Lapua Midas Plus
0.177 Lapua Polar Biathlon
0.187 Eley Match EPS
0.193 Eley Match
0.203 Lapua Midas M
0.215 Lapua Center X
0.216 Western Value Pack
0.229 Lapua Signum
0.241 Lapua Master L
0.243 Eley Pistol Match
0.256 Olin Ball
0.256 Akah X-Zone
0.261 Lapua Midas L
0.261 Lapua Master M
0.263 Eley Tenex Semi Auto
0.270 Lapua Super Club
0.272 Eley Tenex
0.303 Lapua Standard Plus
0.312 CCI Standard Velocity
0.319 RWS R 50
0.319 Eley Standard
0.328 SK High Velocity
0.339 Eley Club Xtra
0.340 Winchester T22
0.356 Federal Champion
0.362 Eley Subsonic HP
0.371 CCI Mini Mag
0.376 Federal American Eagle
0.377 Norinco Target
0.380 Sellier & Bellot Club
0.384 Eley Club
0.387 Eley Sport
0.388 Totem
0.392 Swartklip Match Trainer
0.398 Federal Gold Medal
0.403 Swartklip HV
0.409 Eley Match Xtra Plus
0.424 Sellier & Bellot Std
0.443 Remington Target
0.461 Lapua Crow HP
0.475 Eley Silhouex
0.479 Magtech
0.498 Eley High Velocity
0.513 Winchester Super X
0.516 Kassnar Concorde
0.539 CCI Blazer
0.560 Winchester Supreme Pistol
0.576 Norinco Pistol Revolver
0.593 SK Standard
0.611 Sellier And Bellot HP
0.626 SK Standard HP
0.686 Logo HV
0.956 Pobjeda Target
0.274 Lapua Center X
0.283 Lapua Standard Plus
0.295 Eley Tenex Ultimate EPS
0.307 Lapua Midas M
0.329 Lapua Master M
0.346 Eley Match
0.373 Lapua Polar Biathlon
0.399 RWS R 50
0.432 Lapua Midas L
0.448 Eley Tenex Semi Auto
0.467 Eley Match EPS
0.474 Lapua master L
0.491 Eley Match Xtra Plus
0.494 CCI Standard
0.496 Eley Subsonic HP
0.507 Eley Sport
0.512 Federal American Eagle
0.513 SK High Velocity
0.514 Eley Standard
0.516 Eley Tenex
0.516 Lapua Crow HP
0.532 Western Value Pack
0.533 Fed. Champion Target
0.535 Lapua Midas Plus
0.564 Akah X Zone
0.566 Olin Ball
0.573 Eley Club Xtra
0.616 Lapua Signum
0.631 Winchester T22
0.639 Swartklip HV HP
0.641 Eley Club
0.642 Eley Silhouex
0.647 CCI Mini Mag
0.679 Eley Pistol Match
0.682 Swartklip Match Trainer
0.690 Federal Gold Medal
0.692 Remington HV
0.703 Lapua Super Club
0.720 Winchester Super X
0.738 Eley High Velocity
0.759 Kassnar Concorde
0.765 Sellier And Bellot Club
0.770 Winch. Supreme Pistol
0.770 Norinco target
0.775 CCI Blazer
0.802 Norinco Pistol Revolver
0.841 LVE Logo HV
0.855 Sellier & Bellot Std
0.871 Magtech
0.923 Sellier & Bellot HP
0.934 SK Standard HP
1.017 Remington Target
1.257 Totem Standard
1.442 SK Standard
1.578 Pobjeda target
0.455 Eley Match
0.510 Lapua Midas Plus
0.549 Lapua Midas M
0.611 Lapua Polar Biathlon
0.611 Eley Tenex Ultimate EPS
0.619 Eley Match EPS
0.622 Eley Club
0.630 Lapua Center X
0.631 RWS R50
0.679 Eley Tenex Semi Auto
0.694 Lapua Midas L
0.729 Eley Tenex
0.739 Lapua Master L
0.753 Lapua Super Club
0.785 Lapua Master M
0.831 Eley Sport
0.851 Eley Match Xtra
0.859 Lapua Standard Plus
0.867 Akah X-Zone
0.877 Eley Pistol Match
0.907 Norinco Target
0.924 Eley Silhouex
0.939 CCI Standard
0.952 Eley Subsonic HP
0.963 Magtech
0.970 Olin Ball
0.978 Kassnar Concorde
0.995 Eley Club Xtra
1.009 Western Value Pack
1.032 Federal Champion
1.087 Norinco Pistol Revolver
1.100 CCI Mini Mag
1.112 Lapua Crow HP
1.143 Winchester T22
1.142 Federal Gold Medal
1.144 federal American Eagle
1.156 Swartklip Hollo Point
1.165 Lapua Signum
1.170 Swartklip Match Trainer
1.175 Fed. Champion Value Pk
1.182 SK high Velocity
1.201 Totem
1.224 Winchester Super X
1.358 Eley Standard
1.367 Remington High Velocity
1.375 CCI Blazer
1.414 Eley High Velocity
1.450 Remington Target
1.504 LVE Logo
1.813 SK Standard
1.879 S&B Club
1.947 S&B Hollow Point
2.073 SK Standard HP
2.221 S&B Standard
2.266 Pobjeda Target
Permalink - Articles, Bullets, Brass, Ammo 2 Comments »
October 15th, 2016

Measure Your Groups Precisely with OnTarget Software

OnTarget Target group size measure measuring software program

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.

CLICK HERE to Download OnTarget Group-Measuring Software (v1.10 FREE; v2.10 $11.99)

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.

OnTarget software group scanning measureAfter 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.

Permalink - Articles, Competition, Gear Review No Comments »
October 8th, 2016

How to Correct for Parallax — Optics Tip from Nightforce

Nightforce Optics Parallax Newsletter Scope Video

PARALLAX – What is it and Why is it important?

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.

Nightforce Optics Parallax Newsletter Scope Video

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.

Permalink - Articles, - Videos, Optics No Comments »
October 6th, 2016

Precision Rifle Blog Reveals Muzzle Brake Blast Patterns

Precision Rifle Blog Muzzle Brake Test Blast Powder

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.

GO to PRB Muzzle Brake Blast Pattern TEST PAGE

Precision Rifle Blog Muzzle Brake Test Blast Powder

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.

Permalink - Articles, Tactical No Comments »
October 1st, 2016

AccurateShooter.com Offers Wealth of Content and Active Forum

AccurateShooter.com Facebook Page

If you enjoy our stories and would like to get daily News Updates and Tech Tips, go to www.facebook.com/accurateshooter and click the “LIKE” button.

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.

accurateshooter.com Cartridge Guide Content Diagram

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.

AccurateShooter.comAccurateShooter.com Features:

Permalink - Articles, Reloading No Comments »
September 26th, 2016

Are These Really the TEN BEST Bolt-Action Rifles?

Ten 10 best bolt action rifles shooter

A while back, RifleShooter online magazine published a list of the purported Ten Best Bolt-Action Rifles of All Time. Ten classic rifle designs (including the Remington 700 and Winchester Model 70) were featured with a paragraph or two explaining their notable features.

“Best” Lists Stir Controversy…
These Top 10 lists are always controversial. While most readers might approve of half the entries, there are always some items on the Top 10 list that some readers would challenge. Here is RifleShooter’s Top 10 list. What do you think? Are there some other bolt-actions that are more deserving?

1. Springfield M1903
2. Mauser 98
3. Winchester Model 70
4. Remington Model 700
5. Weatherby V

6. Sako L61/AV
7. Savage Model 110
8. Ruger M77
9. Tikka T3
10. Mannlicher-Schonauer

10bolt1402.

Permalink - Articles, Gunsmithing 10 Comments »
September 20th, 2016

3D Metal Printed Rimfire Receiver from New Zealand

Rimfire .22 LR Receiver action 3D Printer Printing custom action New Zealand 40X PT&G

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.

Rimfire .22 LR Receiver action 3D Printer Printing custom action New Zealand 40X PT&G

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.”

Rimfire .22 LR Receiver action 3D Printer Printing custom action New Zealand 40X PT&G

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.”

Permalink - Articles, Gunsmithing, New Product 1 Comment »
September 15th, 2016

Dennis Does Perry — Two Weeks at the National Matches

Dennis Santiago First Time Camp Perry

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.

Dennis Santiago First Time Camp Perry

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.
Dennis Santiago First Time Camp Perry

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.

Permalink - Articles, Competition 1 Comment »
September 6th, 2016

Stock Reborn: Second-Hand Anschutz Becomes F-Open Beauty

Anschutz 1411 stock gunsmithing project wood work palma rifle f-class F-Open stocking

Here is an interesting project by one of our Forum members. Martin C. (aka “Killick”) modified an Anschutz 1411 Match 54 rimfire prone stock to become a comfortable, great-tracking F-Class Open Division Stock. No Killick didn’t sacrifice a perfectly good rimfire rifle for this project — he bought the Anschutz stock by itself on eBay, then transformed it…

Killick explains: “This project started about seven years ago. I bought the Anschutz prone stock on eBay and whittled it a bit into a Palma rifle with a Barnard action and block and a Doan Trevor cheek piece and scope rail. Then about two years ago I decided to re-task the stock/action assembly into an F-Open rig. With more whittling, gluing, sanding, body fillering, sanding, filling, sanding, more sanding…and sanding, forming, priming, sanding, painting, waiting, painting, painting…painting and before you know it, Bob’s your uncle.”

Here is the eBay-sourced Anschutz 1411 stock, with new high-gloss blue finish, as initially modified for use in Killick’s centerfire Palma rifle. Looks nice!

Anschutz 1411 stock gunsmithing project wood work palma rifle f-class F-Open stocking

Next step was the addition of a 3″-wide wood fore-end for F-Open duties with front rest:

Anschutz 1411 stock gunsmithing project wood work palma rifle f-class F-Open stocking

Anschutz 1411 stock gunsmithing project wood work palma rifle f-class F-Open stocking

Almost done here… just needs priming and final painting:

Anschutz 1411 stock gunsmithing project wood work palma rifle f-class F-Open stocking

Here is Killick’s completed F-Open rifle with its much-modified Anschutz stock now finished in fire-engine red lacquer. This image shows the detail of the grip and customized cheekpiece.

Anschutz 1411 stock gunsmithing project wood work palma rifle f-class F-Open stocking

To learn more, visit Killick’s Anschutz Stock F-Class Project Thread on our Shooters’ Forum.

Permalink - Articles, Gunsmithing No Comments »
September 3rd, 2016

TECH SAVVY: Check out AccurateShooter’s Technical Articles

AccurateShooter.com technical articles

AccurateShooter.comReaders 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.

pillar Bedding

Stress-Free Pillar Bedding. Richard Franklin explains how to do a top-quality bedding job, start to finish.

On Target Software Review

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 Torque Settings

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.

Precision Case Prep for Reloading

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.

rifle stock painting and spraying

Stock Painting Instructions. Step-by-step guide for stock painting by expert Mike Ricklefs. Mike shows both simple coverage and fancy effects.

Permalink - Articles, Tech Tip 1 Comment »
September 1st, 2016

Humidity and Powder Burn Rates — What You Need to Konw

Tech Tip Norma Powder gunpowder moisture temperature humidity

Most shooters realize that significant changes in temperature will alter how powders perform. That’s why you want to keep your loaded ammo out of the hot sun, and keep rounds out of a hot chamber until you’re ready to fire. But there are other factors to be considered — HUMIDITY for one. This article explains why and how humidity can affect powder burn rates and performance.

We’ve all heard the old adage: “Keep your powder dry”. Well, tests by Norma have demonstrated that even normal environmental differences in humidity can affect the way powders burn, at least over the long term. In the Norma Reloading Manual, Sven-Eric Johansson, head of ballistics at Nexplo/Bofors, presents a very important discussion of water vapor absorption by powder. Johansson demonstrates that the same powder will burn at different rates depending on water content.

Powders Leave the Factory with 0.5 to 1.0% Water Content
Johansson explains that, as manufactured, most powders contain 0.5 to 1% of water by weight. (The relative humidity is “equilibrated” at 40-50% during the manufacturing process to maintain this 0.5-1% moisture content). Importantly, Johansson notes that powder exposed to moist air for a long time will absorb water, causing it to burn at a slower rate. On the other hand, long-term storage in a very dry environment reduces powder moisture content, so the powder burns at a faster rate. In addition, Johansson found that single-base powders are MORE sensitive to relative humidity than are double-base powders (which contain nitroglycerine).

Tests Show Burn Rates Vary with Water Content
In his review of the Norma Manual, Fred Barker notes: “Johansson gives twelve (eye-opening) plots of the velocities and pressures obtained on firing several popular cartridges with dehydrated, normal and hydrated Norma powders (from #200 to MRP). He also gives results on loaded .30-06 and .38 Special cartridges stored for 663 to 683 days in relative humidities of 20% and 86%. So Johansson’s advice is to keep powders tightly capped in their factory containers, and to minimize their exposure to dry or humid air.”

Confirming Johansson’s findings that storage conditions can alter burn rates, Barker observes: “I have about 10 pounds of WWII 4831 powder that has been stored in dry (about 20% RH) Colorado air for more than 60 years. It now burns about like IMR 3031.”

What does this teach us? First, all powders start out with a small, but chemically important, amount of water content. Second, a powder’s water content can change over time, depending on where and how the powder is stored. Third, the water content of your powder DOES make a difference in how it burns, particularly for single-base powders. For example, over a period of time, a powder used (and then recapped) in the hot, dry Southwest will probably behave differently than the same powder used in the humid Southeast.

Reloaders are advised to keep these things in mind. If you want to maintain your powders’ “as manufactured” burn rate, it is wise to head Johannson’s recommendation to keep your powders tightly capped when you’re not actually dispensing charges and avoid exposing your powder to very dry or very humid conditions. The Norma Reloading Manual is available from Amazon.com.

Real-World Example — “Dry” H4831sc Runs Hotter

Robert Whitley agrees that the burn rate of the powder varies with the humidity it absorbs. Robert writes: “I had an 8-lb. jug of H4831SC I kept in my detached garage (it can be humid there). 43.5-44.0 gr of this was superbly accurate with the 115 Bergers out of my 6mm Super X. I got tired of bringing it in and out of the garage to my house for reloading so I brought and kept the jug in my reloading room (a dehumidified room in my house) and after a few weeks I loaded up 43.5 gr, went to a match and it shot awful. I could not figure out what was going on until I put that load back over the chronograph and figured out it was going a good bit faster than before and the load was out of the “sweet spot” (42.5 – 43.0 gr was the max I could load and keep it accurate when it was stored in less humid air). I put the jug back in the garage for a few weeks and I now am back to loading 43.5 – 44.0 gr and it shoots great again. I have seen this with other powders too.”

If you have two jugs of the same powder, one kept in a room in your house and one somewhere else where it is drier or more humid, don’t expect the two jugs of the same lot of powder to chrono the same with the same charge weights unless and until they are both stored long enough in the same place to equalize again.

Permalink - Articles, Reloading No Comments »