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January 4th, 2025

How to See Mirage and Bullet Trace with Spotting Scope

Nikon MEP-30 Reticle Eyepiec
Nikon offers eyepieces with reticles for its flagship Monarch Fieldscopes. Eyepiece reticles help spotters call shot corrections with precise click values (MOA or Mils).

Spotting Scope Video mirage tipsUsing a spotting scope seems simple. Just point it at the target and focus, right? Well, actually, it’s not that simple. Sometimes you want to watch mirage or trace, and that involves different focus and viewing priorities. Along with resolving bullet holes (or seeing other features on the target itself), you can use your spotting scope to monitor mirage. When watching mirage, you actually want to focus the spotting scope not on the target, but, typically, about two-thirds of the distance downrange. When spotting for another shooter, you can also use the spotting scope to watch the bullet trace, i.e. the vapor trail of the bullet. This will help you determine where the bullet is actually landing, even if it does not impact on the target backer.

In this video, SFC L.D. Lewis explains how to use a spotting scope to monitor mirage, and to watch trace. SFC Lewis is a former Army Marksmanship Unit member, U.S. Army Sniper School instructor, and current U.S. Army Reserve Service Rifle Shooting Team member. In discussing how precision shooters can employ spotting scopes, Lewis compares the use of a spotting scope for competition shooters vs. military snipers. NOTE: You may wish to turn up the audio volume, during the actual interview segment of this video.

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January 4th, 2025

You DO Need to Chronograph Factory Ammo to Confirm True MV

muzzle velocity applied Ballistics MV chronograph

Why You CANNOT Rely on the MV Printed on the Ammo Box!
When figuring out your come-ups with a ballistics solver or drop chart it’s “mission critical” to have an accurate muzzle velocity (MV). When shooting factory ammo, it’s tempting to use the manufacturer-provided MV which may be printed on the package. That’s not such a great idea says Bryan Litz of Applied Ballistics. Don’t rely on the MV on the box, Bryan advises — you should take out your chrono and run your own velocity tests. There are a number of reasons why the MV values on ammo packaging may be inaccurate. Below is a discussion of factory ammo MV from the Applied Ballistics Facebook Page.

Five Reasons You Cannot Trust the Velocity on a Box of Ammo:

1. You have no idea about the rifle used for the MV test.

2. You have no idea what atmospheric conditions were during testing, and yes it matters a lot.

3. You have no idea of the SD for the factory ammo, and how the manufacturer derived the MV from that SD. (Marketing plays a role here).

4. You have no idea of the precision and quality of chronograph(s) used for velocity testing.

5. You have no idea if the manufacturer used the raw velocity, or back-calculated the MV. The BC used to back track that data is also unknown.

1. The factory test rifle and your rifle are not the same. Aside from having a different chamber, and possibly barrel length some other things are important too like the barrel twist rate, and how much wear was in the barrel. Was it just recently cleaned, has it ever been cleaned? You simply don’t know anything about the rifle used in testing.

2. Temperature and Humidity conditions may be quite different (than during testing). Temperature has a physical effect on powder, which changes how it burns. Couple this with the fact that different powders can vary in temp-stability quite a bit. You just don’t know what the conditions at the time of testing were. Also a lot of factory ammunition is loaded with powder that is meter friendly. Meter friendly can often times be ball powder, which is less temperature stable than stick powder often times.

3. The ammo’s Standard Deviation (SD) is unknown. You will often notice that while MV is often listed on ammo packages, Standard Deviation (normally) is not. It is not uncommon for factory ammunition to have an SD of 18 or higher. Sometimes as high as 40+. As such is the nature of metering powder. With marketing in mind, did they pick the high, low, or average end of the SD? We really don’t know. You won’t either until you test it for yourself. For hand-loaded ammo, to be considered around 10 fps or less. Having a high SD is often the nature of metered powder and factory loads. The image below is from Modern Advancements in Long Range Shooting: Volume II.

muzzle velocity applied Ballistics MV chronograph

4. You don’t know how MV was measured. What chronograph system did the manufacturer use, and how did they back track to a muzzle velocity? A chronograph does not measure true velocity at the muzzle; it simply measures velocity at the location it is sitting. So you need to back-calculate the distance from the chrono to the end of the barrel. This calculation requires a semi-accurate BC. So whose BC was used to back track to the muzzle or did the manufacturer even do that? Did they simply print the numbers displayed by the chronograph? What kind of chronograph setup did they use? We know from our Lab Testing that not all chronographs are created equal. Without knowing what chronograph was used, you have no idea the quality of the measurement.

5. The MV data may not be current. Does the manufacturer update that data for every lot? Or is it the same data from years ago? Some manufacturers rarely if ever re-test and update information. Some update it every lot (ABM Ammo is actually tested every single lot for 1% consistency). Without knowing this information, you could be using data for years ago.

CONCLUSION: Never use the printed MV off a box of ammo as anything more than a starting point, there are too many factors to account for. You must always either test for the MV with a chronograph, or use carefully obtained, live fire data. When you are using a Ballistic Solver such as the AB Apps or Devices integrated with AB, you need to know the MV to an accuracy down to 5 fps. The more reliable the MV number, the better your ballistics solutions.

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January 3rd, 2025

Great Long-Range Shooting Advice from Bryan Litz — Six Tips

NRA F-Class F-TR F-Open Nationals National Championships Bryan Litz

Berger SW Nationals Bryan Litz

Today we share some smart tips from a past F-Class and Sling Champion who is both a great shooter AND a ballistics wizard. Founder of Applied Ballistics LLC, Bryan Litz is the author of multiple books and creator of advanced Ballistics Software.

Bryan is also a highly skilled competitor. In 2015, Bryan Litz won the F-TR Mid-Range AND Long-Range National Championships hosted at Ben Avery. And at the 2014 Berger SW Nationals (SWN), Bryan took top honors among all sling shooters. If you only know Bryan Litz from his Applied Ballistics Books and DVDs, you may not realize that this guy is a also great marksman along with being an actual rocket scientist!

Given his impressive track record in both F-Class and Palma (Fullbore) out to 1000 yards, we asked Bryan if he had any advice for other long-range competitors.

First Bryan provided three tips concerning Ballistics, his special area of expertise. Next Bryan offered three more general tips about long-range competition — how to analyze your shooting, how to choose your ‘wind strategy’, and how to avoid the most costly mistakes, i.e. how to avoid the “train-wrecks”.

Bryan Litz won the 2015 F-TR Mid-Range and Long-Range Championships with this sleek rig:
NRA F-Class F-TR F-Open Nationals National Championships Bryan Litz

Litz Ballistics Tips

Ballistics TIP ONE. If you’re having trouble getting your ballistic software to match actual drops, you need to look at a number of possible reasons. Here are some common issues that can cause problems.

Click Values Are Not Exact. Scopes and iron sights don’t always produce accurate adjustments. In other words, if your ballistics program predicts 30 MOA of drop, and you dial 30 MOA but hit low, it might be that your sight actually only moved 28 MOA (for example). To see if your sight is adjusting accurately, shoot a tall target at 100 yards and measure group separation when dialing your sight.

Barometric vs. Station Pressure. This is a commonly misunderstood input to ballistics programs. You can avoid this pitfall by remembering the following: station pressure is the actual measured pressure at your location, and you don’t need to tell the program your altitude when using station pressure. Barometric pressure is corrected for sea level. If you’re using barometric pressure, you also have to input your altitude.

Muzzle Velocity. Chronographs are not always as accurate as shooters think they are — your true MV may be off by 10-20 fps (or more). If your drop is different than predicted at long range, it might be because your muzzle velocity input is wrong.

Mixing Up BC (G1 vs. G7). Knowledgeable long range shooters know that the G7 standard is a more representative standard for modern LR bullets. However, using G7 BCs isn’t just a matter of clicking the ‘G7′ option in the program. The numeric value of the BC is different for G1 and G7. For example, the G1 BC of the Berger 155.5 grain Fullbore bullet is .464 but the G7 BC is .237. If you were to enter .464 but click on G7, the results would be way off.

Ballistics TIP TWO. A properly installed level is absolutely essential for long range shooting. Without a good level reference, your long range wind zero will be off due to minor canting of the rifle from side to side. You can verify that your level is installed correctly on a 100-yard ‘tall target’. Draw a plumb line straight up the target and verify that your groups track straight up this line as you go up in elevation.

Ballistics TIP THREE. If your long range ballistic predictions aren’t tracking, always come back and verify your 100-yard zero. Sometimes a simple zero shift can be misconstrued as errors in long range ballistics predictions.

Bryan Litz Tips

Litz Competition Shooting Tips

Competition TIP ONE. Improving your scores in long range competition is a constant process of self-assessment. After each match, carefully analyze how you lost points and make a plan to improve. Beginning shooters will lose a lot of points to fundamental things like sight alignment and trigger control. Veteran shooters will lose far fewer points to a smaller list of mistakes. At every step along the way, always ask yourself why you’re losing points and address the issues. Sometimes the weak links that you need to work on aren’t your favorite thing to do, and success will take work in these areas as well.

CMP Long range camp Perry Nationals National Championships Bryan Litz

Competition TIP TWO. Select your wind shooting strategy carefully. For beginners and veterans, most points are typically lost to wind. Successful shooters put a lot of thought into their approach to wind shooting. Sometimes it’s best to shoot fast and minimize the changes you’ll have to navigate. Other times it’s best to wait out a condition which may take several minutes. Develop a comfortable rest position so you have an easier time waiting when you should be waiting.

Competition TIP THREE. Actively avoid major train wrecks. Sounds obvious but it happens a lot. Select equipment that is reliable, get comfortable with it and have back-ups for important things. Don’t load on the verge of max pressure, don’t go to an important match with a barrel that’s near shot out, physically check tightness of all important screws prior to shooting each string. Observe what train wrecks you and others experience, and put measures in place to avoid them.

Saturday movies F-Class Bisley Ben Avery NRA Championships F-Open F-TR
Looking down-range with F-TR rifle at Ben Avery Shooting Facility in Phoenix, Arizona.

Bullet Stability and Twist Rates

In this video, Bryan Litz talks about bullet in-flight stability and how to calculate barrel twist-rate requirements for long-range bullets. Bryan explains that bullet stability (for conventional projectiles) is basically provided by the spinning of the bullet. But this spin rate is a function of BOTH the nominal twist rate of the barrel AND the velocity of the projectile. Thus, when shooting the same bullet, a very high-speed cartridge may work with a slower barrel twist rate than is required for a lower-speed (less powerful) cartridge. For match bullets, shot at ranges to 1000 yards and beyond, Bryan recommends a twist rate that offers good stability.

Bryan Litz long range shooting advice applied ballistics

You’ll find more expert information on long-range shooting and ballistics on the Applied Ballistics website and the Bryan Litz Ballistics Facebook page. Bryan’s most recent Facebook post talks about the Coriolis effect — the apparent drift of a rifle trajectory due to the rotation of the earth.

To learn more, we recommend you subscribe to the Applied Ballistics Science of Accuracy — with in-depth articles, brilliant podcasts, exclusive videos and more.

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January 2nd, 2025

Electronic vs. Mechanical Gun Safe Locks — Things to Consider

mechanical dial keypad electronic gunsafe safe security locking lock

Electronic (Keypad) Lock vs. Manual (Rotary) Lock

Smart gun owners know they need a good, solid gun safe. But when choosing a gun safe, what kind of lock should you select — electronic or mechanical? Both types have their advantages and disadvantages. This article will help you make the right choice for your needs and also get the most reliable performance from either type.

gunsafe gun safeGunsafes can be fitted with either an electronic keypad-style lock, or a conventional dial lock. In our Gunsafe Buyer’s Guide, we explain the important features of both dial and electronic lock systems. Many safe-makers will tell you that consumers prefer electronic locks for convenience. On the other hand, most of the locksmiths we’ve polled believe that the “old-fashioned” dial locks, such as the Sargent & Greenleaf model 6730, will be more reliable in the long run. CLICK HERE to learn more about the Pros and Cons of Mechanical (dial) Lock vs. Electronic (keypad) safe locking systems.

One safe supplier, The Safe Keeper, notes that mechanical (dial) locks tend to be more reliable over long periods: “When it comes to reliability, a mechanical lock is the way to go. Anything electronic is designed to fail sooner or later. For every 20 broken electronic locks we will get one mechanical. Bottom line is, it’s not that complicated to input a combination on a mechanical lock. Those extra 7 seconds just might save you from being locked out and having your safe drilled opened.”


This Liberty Safe video compares Mechanical (dial or key) vs. Electronic (keypad) safe locking systems.

Here is the opinion of RFB from Michigan. He is a professional locksmith with over two decades of experience servicing locks and safes of all brands and types:

What a Professional Locksmith Says:
For the convenience of quick opening, the electronic locks can’t be beat. However, for endurance and years of trouble-free use, the electronics can’t compare with the dial lock.

I’ve earned my living, the past 22 years, servicing locks of all types. This includes opening safes that can’t otherwise be opened. I do warranty work for several safe manufacturers (including Liberty). What I’ve learned in all those years is that manual dial locks have very few problems. The most common is a loose dial ring which can shift either left or right, which will result in the index point being in the wrong place for proper tumbler alignment. This is simple to fix.

Electronic locks, however, can have all kinds of issues, and none (except bad key-pad) are easy to fix, and when one goes bad, it must be drilled into to open it. IMO, it’s not a matter of ‘if’ an electronic lock will ultimately fail, but a matter of ‘when’ it will fail. Over the past 10 years or so, since electronics have become more and more prevalent, I’ve had to drill open bad electronic locks vs. bad manual dial locks on a ratio of about 20-1.

My professional opinion is to get the manual dial lock, unless you’ve got a good friend who is a locksmith/safecracker.

How Secure is Your Lock?
RFB tells us that both dial and electronic locks offer good security, provided it’s a good quality lock made by LaGard, Sargent & Greenleaf, Amsec, or Kaba/Ilco. However, RFB warns that “Some of the ‘cheaper’ locks (both manual and electronic) however, are very simple to bypass.

An electronic lock that’s glued or ‘stuck’ to the door with double-sided tape, and has its ‘brain’ on the outside of the lock in the same housing as the keypad, and merely sends power to an inner solenoid via a pair of wires through the door, is a thief’s best friend. The good ones have the brain inside the safe, inaccessible from the outside.

No amateur can ‘manipulate’ either a good manual or electronic lock. Both give you a theoretical one million possible combinations. I say ‘theoretical’ because there are many combinations that cannot, or should not, be used. You wouldn’t set your combo on a dial lock to 01-01-01 etc., nor would you set an electronic to 1-1-1-1-1-1, or 1-2-3-4-5-6.”

Tips for Dial Locks
RFB notes that “The speed, and ease of use, of a manual dial lock can be improved upon, simply by having your combo reset using certain guidelines. Avoid high numbers above 50. Having a 1st number in the 40s, 2nd number anywhere from 0-25, and 3rd number between 25 and 35 will cut dialing time in half, without compromising security. (For mechanical reasons I won’t get into here, the 3rd number of a good manual dial lock cannot — or should not — be set to any number between 95 & 20).”

Tips for Electronic Locks
Electronic locks can have the combination changed by the user much more easily than dial locks. That should be a good thing. However, RFB explains: “That can be a double-edged sword. More than a few times I’ve had to drill open a safe with an electronic lock that has had the combo changed incorrectly by the user, resulting in an unknown number that nobody can determine. Also, don’t forget that electronic locks have a ‘wrong-number lock-out’. I would NOT rely on the normal quickness of an electronic 6-number combo in an emergency situation. If for any reason (panic etc.) you punch in the wrong number several times, the lock will shut down for a 5-minute ‘penalty’.

Replace Electronic Lock Batteries Every Year
To get the most life out of any electronic (keypad Lock), you should change the battery at least once a year, whether it needs it or not. Low voltage won’t necessarily shut down the lock, but using it in a low voltage situation is bad for the electronics, and eventually will cause lock failure. So, If you do nothing else to maintain your digital-lock safe, replace the battery every year.

And get a fresh battery (with a release date) from the store — don’t just pull a battery out of a storage bin, even if it’s never been used. Old batteries can lost “juice” and physically degrade, even when in storage.

This article is Copyright 2023 AccurateShooter.com. No reproduction on any other website is authorized without payment of licensing fees or liquidated damages.

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January 1st, 2025

Key Qualities of Winning Barrels — Brux Co-Owner Explains

brux barrels cut-rifle rifling Erik Cortina Krieger Ken Clemens

In this 54-minute video interview, Ken Clemens, co-owner of Brux Barrels, is interviewed by F-Class ace Erik Cortina for the Cortina Precision YouTube Channel. A lot of ground is covered, with many fascinating insights into barrel-making revealed. Watch and learn:

Interview with Ken Clemens, Co-owner of Brux Barrels

brux barrels cut-rifle rifling Erik Cortina Krieger Ken Clemens

If you are involved in competitive shooting, and especially if you compete in F-Class or long-range benchrest, we recommend you take the time to watch this interview, perhaps in a couple of sessions because it runs for a lengthy 54 minutes. Ken Clemens explains the important procedures that go into making match-grade, cut-rifled barrels. Ken also explains some factors to consider when choosing a barrel-maker and specifying length, contour, land/groove configuration, and twist rates.

For more information visit BruxBarrels.com, use the online PRICE ESTIMATOR, or call (608) 592-3324.

brux barrels cut-rifle rifling Erik Cortina Krieger Ken ClemensAbout BRUX Barrel-Making Methods
Brux starts with 4150 chrome-moly or 416R stainless steel double-stress-relieved bar stock — the best available. Barrels are bored with the Barnes gun drill, and reamed with an industry-standard Pratt & Whitney reamer. Brux uses solid carbide cutter hooks and employs special methods to achieve best results.

After the bore-cutting process is complete, each barrel is hand-lapped to high-precision standards. Multi-point inspections and meticulous hand processes (not possible in mass production) ensure extremely high quality. The Brux website says: “If there is the slightest deviation in surface finish or tolerance, the barrel is discarded.”

BRUX Specializes in Cut-Rifled Gun Barrels
Brux produces custom cut-rifled barrels, precision-crafted by professionals with extensive experience in both machine tools and competitive shooting. While Brux earned its reputation building great barrels for F-Class, benchrest, and long range competition, Brux also crafts hunting barrels. Brux states: “Hunters, big game and varmint, can benefit from the accuracy and dependability of a custom barrel made to your specifications.”

brux barrels cut-rifle rifling Erik Cortina Krieger Ken Clemens

BRUX Barrels’ Owners Are Competitive Shooters
Brux owners and machinists are shooters themselves. So they understand how important a truly top-quality barrel can be. Everything else about a rifle can be great, but you need a superb barrel to win at the highest level. Owners Ken Clemens (pictured above) and Norm Brux are both seasoned shooters with years of experience using their own products.

Made in the USA — About the Home of Brux Barrels
The Wisconsin River Valley near Lodi has a storied history of hunting and shooting. The glacier spared many granite escarpments, leaving secluded glens and a topography rich in soil and wildlife habitat, which attracted families with old-world values and skills. Many of their descendants turned raw steel and iron into the tools necessary for farming – and some evolved to precision tooling and making gun barrels.

brux barrels cut-rifle rifling Erik Cortina Krieger Ken Clemens
Wisconsin River Valley near Ferry Bluff State Natural Area.

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January 1st, 2025

What Causes .22 LR Rimfire Misfires and How to Prevent Them

rimfire Ammo 22 plinkster cheaper than dirt

“22 Plinkster” is an avid shooter who has produced a number of entertaining videos for his YouTube Channel. In the video below, he tackles the question “Why Do Misfires Occur in .22 LR Rimfire Ammunition?” This is the most common question posed to 22 Plinkster by his many viewers. He identifies four main issues that can cause .22 LR misfires or faulty ignition:

1. Damaged Firing Pin — The dry firing process can actually blunt or shorten the firing pin, particularly with older rimfire firearms. Use of snap caps is recommended.

2. Poor Ammunition — Some cheap brands have poor quality control. 22 Plinkster recommends using ammo from a manufacturer with high quality control standards, such as CCI and Federal.

3. Age of Ammunition — Rimfire ammo can function well for a decade or more. However the “shelf life” of rimfire ammunition is not infinite. You ammo’s “lifespan” will be shortened by heat, moisture, and humidity. You should store your rimfire ammo in a cool, dry place.

4. Mishandling of Ammunition — Tossing around ammunition can cause problems. Rough handling can cause the priming compound to be dislodged from the rim. This causes misfires.

Preventing misfires is essential if you want to succeed in NRL22 competition and other rimfire competition disciplines run “on the clock”.

rimfire Ammo 22 plinkster cheaper than dirt

Top Image courtesy Cheaper Than Dirt Shooters Log.

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December 30th, 2024

How to Sell Firearms Online Via Auctions and Forum Classifieds

Gunbroker shooters forum gun classified ads

online sales auctionsThese days, online gun Auctions and Classifieds attract more attention than ever. With so many folks accessing the internet daily, many gun owners find it easier to sell their firearms online rather than in the local gun store. Online selling opens up a much larger audience. With over 76,500 members in the AccurateShooter Forum, we have a very active gun Classifieds area. And then of course, there are the big dogs — Gunbroker and GunsAmerica. You’ll find tens of thousands of guns for sale on those big sites.

Before selling your stuff online, you should survey the major online sales and auction sites, comparing their fees and features. The costs are NOT all the same. For example, though you can list an item on Gunbroker for free, if the gun sells you may end up paying a LOT of money. Confirm this with the Gunbroker FEE Calculator. Using Gunbroker’s Fee Calculator we determined that, for a $2500.00 gun, the seller will pay $108.00 in fees! Yes, that’s for a single sale.

That’s why many sellers prefer to list their rifles on Benchrest.com, or on the AccurateShooter.com FORUM Classifieds. Currently, basic Accurate Forum members get two (2) free adverts in a 12-month period, while Gold and Silver members get unlimited classifieds for 12 months. A $30 Silver membership is less than you’d pay to sell one single $600 item on Gunbroker ($32.00 fee).

SEVEN TIPS for Selling Your Gear Online

1. Include Good, Sharp Photos: A custom rifle or expensive optic will sell two to three times as quickly, at a higher price, if you include good sharp photos. We can’t over-emphasize the importance of good photos. For all products, show multiple angles, and include the original boxes if you still have them. For a rifle, include detail shots as well as a photo of the complete gun.

online auction product selling accurateshooter forum classifieds

2. Resize Your Photos Before Posting: Half of users will probably be viewing your ads with a smartphone. So you don’t need huge photos. We recommend you size your photos down to 1000 pixels wide. This will make uploads more efficient and ensure the Forum server can handle the file sizes.

3. Be Fair and Complete in Your Description: Buyers appreciate honesty and thoroughness in product descriptions. Potential buyers want details. For a rifle, list the gunsmith, barrel-maker, round count, and provide the specifications. If the rifle has a winning competition history, say so. Always highlight the positives in your description, but you should disclose significant flaws. A buyer will be more willing to purchase if he thinks the seller is 100% honest.

4. Don’t Forget Contact Info: We’re amazed by how many adverts omit key contact info. In a forum classified ad, include a first name, e.g. “Ask for Dan.” We also suggest you list your residence city and state. Some buyers will prefer to buy from a seller in their home state. When communicating with a buyer, provide your phone number and email address. We recommend that all buyers and sellers actually talk live on the phone before concluding high-value deals.

5. Make the Price Attractive: Buyers, everywhere, are looking for good deals. If you want your item to move quickly, set the price accordingly and don’t expect top dollar. Check comparable listings and then discount by 10-15% if you want the item to move fast.

6. Include a Call to Action: Advertisements can be twice as effective if they include a “Call to Action”, i.e. a statement that directly inspires the potential buyer to respond. Sample calls to action are: “Free Shipping — today only.” Or, you can use a time limit: “Special Sale Price good ’til the end of the month”.

7. Always Follow ALL Applicable Laws: Even in states where private face-to-face gun sales are allowed, we recommend ALWAYS using an FFL for firearms transfers. This will protect YOU the seller. In addition, do your homework. Don’t sell to a buyer in a city or state (such as California) state or city where the particular firearm (such as an AR15) may be restricted

Classified Advert vs. Auctions
For benchrest, F-Class, Silhouette, Tactical or High Power rifles, you may get the best results posting a For Sale ad on a Forum that caters to the right discipline. You want your ad to reach the right audience. On the other hand, a GunBroker.com auction will have tens of thousands of potential buyers. Realistically, however, if you price your rig attractively, it should sell quickly in a Forum Classified Advert. Plus with conventional Classifieds, you can sell immediately — you don’t have to wait for the auction to end. For scopes and reloading equipment (but not firearms, actions, barrels etc.), also consider eBay, which still allows many gun-related items.

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December 28th, 2024

Access 60+ Authoritative Sierra Ballistics Articles for FREE

Sierra Bullets Ballistics Resources

Need some informative reading material for winter days? Here’s a vast resource available free from Sierra Bullets. Here are links to over 60 articles with information on bullets, ballistic coefficients, wind drift, up/down angles, temperature effects, tailwind effects and much more. Most of these resources come from the respected Sierra Reloading Manuals, 4th and 5th Editions. There are enough articles to read one per week for a year!

Major Ballistics Reference Articles
The Ballistic Coefficient by William T. McDonald & Ted C. Almgren (Adobe .PDF)
Deflections and Drift of a Bullet in a Crosswind by William T. McDonald (Adobe .PDF)
Inclined Fire by William T. McDonald

Table of Exterior Ballistic Coefficients
(5th Edition Reloading Manual)

Rifle
Handgun
.22 Rimfire

Exterior Ballistic Tables
(4th Edition Reloading Manual)

Rifle Tables – Select by Bullet
Handgun Tables – Select by Bullet
Silhouette Tables – Select by Bullet

5th Edition Manual Exterior Ballistics Section
Section 1.0 Introduction
Section 2-2.1 The Ballistic Coefficient Explained
Section 2.2 Bigger Is Not Always Better
Section 2.3 How the Ballistic Coefficient is Measured
Section 2.3.1.1 Measurement Procedure
Section 2.3.1.2 Important Precautions and Points to Consider
Section 2.3.2 Initial Velocity and Time of Flight Method
Section 2.3.3 Doppler Radar Method
Section 2.4 Lessons Learned from Ballistic Coefficient Testing
Section 2.5 Examples of Ballistic Coefficient Measurements
Section 3.0 Exterior Ballistic Effects on Bullet Flight
Section 3.1 Effects of Altitude and Atmospheric Conditions
Section 3.2 Effects of Wind
Section 3.3 Effects of Shooting Uphill or Downhill
Section 3.4-3.4.1 Trajectory Considerations for Sighting in a Gun
Section 3.4.2 Determining Zero Range from Firing Test Results
Section 3.4.3 Sighting in for a Change in Shooting Location
Section 3.5 Point Blank Range
Section 3.6 Maximum Horizontal Range of a Gun
Section 3.7 Maximum Height of Fire of a Gun
Section 4.0 Six Degree of Freedom Effects on Bullet Flight
Section 4.1 Basic Physical Concepts
Section 4.2 Yaw of Repose and Resulting Crossrange Deflection
Section 4.3 Turning of a Bullet to Follow a Crosswind and Resulting Deflections
Section 4.4 Turning of a Bullet to Follow a Vertical Wind and Resulting Deflections
Section 5.0 Trajectory Tables
Section 6.0 Sierra’s Infinity Exterior Ballistics Software

4th Edition Manual Exterior Ballistics Section
Section 2.0 Introduction
Section 3.0 Historical Summary
Section 4.0 The Ballistic Coefficient
Section 4.1 Basic Definitions
Section 4.2 Ballistic Coefficients Effects on Bullet Trajectories
Section 4.3 How the Ballistic Coefficient is Measured by Firing Tests
Section 4.4 Lessons Learned From Ballistic Coefficient Measurements
Section 4.5 Ballistic Coefficient Variations with Muzzle Velocity near the Speed of Sound
Section 4.6 Ballistic Coefficient Dependence on Coning Motion
Section 5.0 Exterior Ballistics Topics
Section 5.1 Effects of Altitude and Atmospheric Conditions
Section 5.2 Effects of Altitude and Uphill/Downhill Shooting
Section 5.3 Wind Effects
Section 5.3.1 Headwinds and Tailwinds
Section 5.3.2 Crosswinds
Section 5.3.3 Winds from Any Direction
Section 5.4 Changing the Zero Range
Section 5.5 Point Blank Range
Section 5.6 Muzzle Velocity Dependence on Cartridge Temperature
Section 6.0 Equations of Bullet Flight
Section 6.1 Differential Equations of Bullet Motion
Section 6.2 Drag Force and the Drag Function
Section 6.3/Section 6.3.1 Siacci’s Method/The Change of Independent Variables
Section 6.3.2 The Assumption
Section 6.4 Mayevski’s Analytical Form of the Drag Model
Section 6.5 Closed-Form Solutions for Trajectory Parameters
Section 6.6 Other Useful Equations
Section 6.6.1 References

Sierra Bullets Ballistics Resources

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December 27th, 2024

How to Rebate Case Rims to Shoot Bigger Cases in PPC Actions

30BR 6 PPC rim rebated Butch Lambert

Many short-range Benchresters have thought about converting their 6 PPC to shoot a 30BR for score matches, or a Dasher for mid-range (or even 1000-yard) games. That way you have a rifle that does double duty, giving you the most bang for your buck. Though an action with a PPC bolt won’t normally work with 30BR/6BR/Dasher cases with their larger .308-class rim (0.4728″ diameter), there is a pretty easy solution that allows you to cycle these bigger cartridges with a 6PPC-style bolt (designed to fit .220 Russian rims).

“Rebating case rims … lets you shoot a 30BR in score matches using your PPC action. All you need is a new barrel. This saves buying another bolt, receiver, or rifle.” — Butch Lambert

Butch Lambert of ShadeTree Engineering provided this tip. Butch notes that many 6 PPC benchrest group shooters also enjoy shooting in score matches. But to be really competitive in the BR for score game, that means shooting a 30BR, which has a wider, .308-class rim (0.4728″ diameter). Likewise, if you want to compete in 600-yard registered BR events or in varmint matches, you probably want to run a bigger case, such as the 6BR, 6mm Dasher, or 6-6.5×47. Those cartridges also have the larger 0.4728″ rims.

30Br Butch Lambers 6 PPC

Rebate Your 30 BR Rims
To convert a PPC-boltface action to shoot bigger cases you can spend a ton of money to buy a new bolt. That can cost hundreds of dollars. The simpler solution is to turn down the diameter of the larger cases on a lathe. Butch explains: “We’ve seen plenty of interest in rebating case rims. This lets you shoot a 30BR in score matches using your PPC action. All you need is a new barrel. This saves buying another bolt, receiver, or rifle if you have a PPC boltface. Anyone who has access to a lathe can do this job pretty easily. Yesterday I turned 150 case in about an hour.”

At right is the lathe form tool Butch uses to rebate the case rims.

Cutting Head for Rebating Rims
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December 26th, 2024

Access FREE State-Specific Travel Guides for Gun Owners

Lawshield Travel guide state national PDF

Summer is approaching. That means many of our readers will be on the road traveling to matches or holiday destinations. LawShield, America’s largest provider of Legal Defense for Self Defense® coverage, offers a National Travel Guide for Gun Owners and state-specific Travel Guides for Gun Owners. These guides feature practical information for people traveling through nearly every state in the USA.

State-Specific Travel Guides — Access for FREE
State-specific Travel Guides and a National Travel Guide for Gun Owners can be accessed for FREE on the the U.S. LawShield website. For planning future travel, bookmark Resources.uslawshield.com/travel-guide,

Lawshield Travel guide state national PDF

Lawshield Travel guide state national PDFAccording to Kirk Evans, President of U.S. LawShield, “Because there are so many details for people to understand before they leave home, we developed state-specific guides to help folks stay on the right side of the law. Take the time to learn the laws before hitting the road because they are not the same everywhere. Don’t wait until after the fact to plan for your guns when preparing for your trip.”

Travel Guide for Gun Owners Topics:
Permits/licenses recognized by specific states
State laws you should know, including vehicle carry, duty to notify law enforcement, and open and concealed carry laws
Where you can legally carry your gun
Federal laws you should know
Carrying in National Parks
Transfer of firearms
Traveling from state to state and the Safe Passage provision
Flying with a firearm, including TSA requirement warnings and how to pack ammunition
Driving with a firearm

See Travel Guide for Gun Owners Summary (8-page PDF) »

Two Knowledgeable Attorneys Explain State Law Issues When Traveling

In this video U.S. LawShield Independent Program Attorneys Richard Hayes and Emily Taylor provide essential information for traveling with firearms. Discussion includes essential information needed to stay safe and responsible while traveling with firearms.

Know the Laws of Every State You Travel Through
“There is no standardization of gun laws within the 50 individual states, so even if a state recognizes your handgun license or permit, they may have additional restrictions on certain types of firearms, magazines, or ammunition,” said Evans. “In some states, it’s illegal for a non-resident to possess a firearm in the passenger compartment of their vehicle. And, because you are subject to a state’s laws when you are in that state, if you break their laws, you could be committing a crime — whether you think you intentionally broke the law or not,” he added.

“Remember, not knowing the law is not a valid defense,” stated Evans. “Use our Travel Guide for Gun Owners for whatever state you’re traveling through, and learn which states honor your carry license or permit before you go.”

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December 25th, 2024

Get FREE SHOT Show 2025 Mobile App for iOS or Android

SHOT Show 2025 Mobile App iOS Apple Android smartphone iphone

Headed to SHOT Show in Las Vegas? Then you should download the FREE SHOT Show Mobile App. Available for all mobile devices, this App really makes it easier to plan your SHOT Show schedule, and navigate the SHOT Show Exhibit zones. The 2025 SHOT Show Mobile App is now available for download. There are versions for Apple and Android smartphones and tablets. And there is even an Apple Watch version. Apple users will find the App in the App Store, Android users will find their version in the Google Play Store. Learn more at SHOT Mobile App Page.

Visit SHOT Mobile Page | GET FREE Apple (iOS) App | GET FREE Android OS App

SHOT Show 2025 Mobile App iOS Apple Android smartphone iphone

Handy Interactive Map
The App includes an interactive map that can direct you from your current location to your next destination. Arrange your meetings with a handy scheduling calendar. And you can search for any SHOT exhibitor by name or product category. In addition, the App lists major show events as well as important new products.

SHOT SHOW 2025 APP FEATURES
— Locate Exhibitor Booths with searchable Vendor Database/Floor Map
— Build a personalized Schedule and bookmark Exhibitors
— Visit bookmarked Exhibitors with Quick Route Feature
— Multi-Device Sync for smartphones, tablets, laptops
— Up-to-date Exhibitor, Speaker, and Event information

The 2025 SHOT Show takes place January 21-24 at the Venetian EXPO and Caesars Forum in Las Vegas, Nevada. Media Day at the Range takes place Monday the 20th in Boulder City. To learn more about SHOT Show, including seminar times, educational resources, event listings, and hotel/travel information, visit SHOTShow.org.

SHOT Show 2024 Mobile App iOS Apple Android smartphone iphone

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December 23rd, 2024

Want to Make an Xmas Gift of a Gun? Learn the Laws First!

firearm gun gift law rules NSSF
Image Courtesy NSSF. This story is based on an NSSF Article.

‘Tis the season of gift-giving (Christmas Day is 8 days hence). Perhaps you’re considering giving a a first rifle to your grandson or perhaps a carry pistol to a spouse. When making a gun gift to a friend or family member, however, there are some very important legal considerations. Also the rules on firearms gift transfers vary from state to state. Bottom line here — you need to know the law BEFORE you deliver that shiny new firearm to a family member, close friend, or relative.

The first thing to remember if you’re thinking about giving someone a gun is that … it’s a gun! You already know that ownership of a firearm brings with it some serious legal and ethical obligations that other consumer products don’t. So let’s look at some questions you may have about giving a firearm as a gift.

firearm gun gift law rules NSSF
Image Courtesy NSSF

ATF Firearms gun giftsThe first question you have to ask is whether the intended recipient can legally own the firearm where he or she lives. With more than 20,000 different gun laws on the books, even the kinds of firearms that law-abiding citizens can own vary from place to place. For example, juveniles (under age 18) generally speaking are precluded by law from possessing a handgun. Check out the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) website for an overview of local laws and, whatever you do, don’t forget that you can never under any circumstances transfer a firearm to someone you know — or have reasonable cause to believe — legally can’t own one. That’s a federal felony, so be careful.

There’s no federal law that prohibits a gift of a firearm to a relative or friend who lives in your home state. Many states — including California, Colorado, Connecticut, Delaware, New York, Oregon, Rhode Island, Washington State and the District of Columbia — require you to transfer a firearm through a local FFL-holder so an instant background check will be performed to make sure the recipient is not legally prohibited from owning the gun. Maryland and Pennsylvania require a background check for private party transfer of a handgun. And yes, Oregon has new restrictions due to the passage of Ballot Measure 114 (though a State Judges has issued an injunction blocking some provision BM 114). There are exceptions, so it’s important to check the law of your state or ask your local firearms retailer.

ATF Firearms gun giftsConsider a Gift Card Instead of Direct Gift
The ATF recommends that if you want to give someone a new firearm, rather than going to a gun store and buying the gun on your own, consider instead purchasing a gift certificate/card from your favorite gun retailer. Then give that gift card as the present. That way the recipient can choose the exact gun he or she wants, and there’s no question about who is “the actual buyer of the firearm”, which is a question any purchaser must certify on the Federal Form 4473 at the time of purchase. The Gift Card option avoids any “straw purchaser” issues.

Intra-Family Transfers and Antique Arms
What if you want to give “Old Betsy,” your favorite old deer rifle, to your son or daughter as a college graduation gift? Again, in some states, there’s no law that says you can’t, but many states require even intra-family transfers to go through a licensed dealer. Remember, you can never transfer a firearm directly to another person who is a resident of a different state. In that case, you must transfer the firearm through a licensed dealer in the state where the person receiving the gift resides.

Using a gift certificate from a firearms retailer near where the recipient lives might be a good solution. Be safe and check with an in-state FFL dealer before you give any firearm to a friend or family member.

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