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August 11th, 2023

How Primers Are Made — Start to Finish at Federal Factory

Federal Primer Priming Tool Magnum primers foil anvil primer construction reloading powder CCI

Do you know how gun primers are made — how the explosive elements are applied into those tiny cups? Find out by watching this video filmed at a Federal ammunition factory. It starts out with empty primer cups loaded, 1000 at a time, into trays using vibration (0:05 time-mark). While much of the process is automated, there is still a significant role played by production workers who apply a green, paste-like charging compound to the inside of hundreds of primer cups.

At the 0:17-second time-mark you can see the factory worker “charging” the primers with the priming compound. After the cups are filled, then the plate of cups “mates up with a plate of anvils” (0:40 time-mark). Then the primers are unloaded from trays and inspected.


Federal Primer Priming Tool Magnum primers foil anvil primer construction reloading powder CCI

Primer “Mysteries and Misconceptions” Article

There is an excellent article about primers on the Shooting Times website. This authoritative Shooting Times article explains the fine points of primer design and construction. The author reveals some little-known facts about primers and corrects common misconceptions. Here are some highlights:

Primer Priming Tool Magnum primers foil anvil primer construction reloading powder CCISize Matters
Useful Trivia — even though Small Rifle and Small Pistol primer pockets share the same depth specification, Large Rifle and Large Pistol primers do not. The standard pocket for a Large Pistol primer is somewhat shallower than its Large Rifle counterpart, specifically, 0.008 to 0.009 inch less.

Magnum Primers
There are two ways to make a Magnum primer — either use more of the standard chemical mix to provide a longer-burning flame or change the mix to one with more aggressive burn characteristics. Prior to 1989, CCI used the first option in Magnum Rifle primers. After that, we switched to a mix optimized for spherical propellants that produced a 24% increase in flame temperature and a 16% boost in gas volume.

Foiled Again
Most component primers have a little disk of paper between the anvil and the priming mix. It is called “foil paper” not because it’s made of foil but because it replaces the true metal foil used to seal early percussion caps. The reason this little disk exists is strictly a manufacturing convenience. Wet primer pellets are smaller than the inside diameter of the cup when inserted and must be compacted to achieve their proper diameter and height. Without the foil paper, the wet mix would stick to the compaction pins and jam up the assembly process.

Read Full Primer Story on ShootingTimes.com

Video find by Boyd Allen. We welcome reader submissions.
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August 11th, 2023

Leica $50-$200 Discounts on Rangemaster Laser Rangefinders

leica laser rangefinder rangemaster crf 2400-R 2800.com 3500.com sale discount

Leica Sport Optics has a limited-time promotion on its excellent Rangemaster CRF laser rangefinders (LRFs). From August 15 to September 30, 2023 you can save $50.00 to $200.00 on three high-qualtiy Leica Rangemaster models:

Rangemaster CRF 2400-R: MSRP $599, promo price $549 — save $50

Rangemaster CRF 2800.COM: MSRP $799, promo price $699 — save $100

Rangemaster CRF 3500.COM: MSRP $1,299, promo price $1099 — save $200

PROMO DATES: These $50 – $200 instant savings go into effect on Tuesday, August 15, 2023 and run through September 30, 2023.

Leica Rangemaster models perform very well, and have a compact design, and handy control features. These models all feature very good glass plus 7X magnification for easy spotting of targets and hunting prey down-range. The higher-end Rangemaster .COM models boost Bluetooth® connectivity. This allows storage, transmission, and management of ballistics data via the Leica Ballistics App.

If you’re in the market for a laser rangefinder — perhaps to use while hunting this fall, you can take advantage of this Leica Rangemaster promo from August 15 through September 30, 2023. Get these limited-time offers by visiting a participating Leica Sport Optics dealer or Leica online optics vendor. We recommend EuroOptic.com, Brownells, and Sportsman’s Warehouse.

CLICK HERE for more information and technical specs on Leica Rangemaster laser rangefinders

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August 10th, 2023

Benefits of Weakside Bolt Placement — For F-Class and Benchrest

left port McMillan Rifle

Most bolt-action rifle shooters work the bolt with their trigger-pulling hand. This is because most rifles sold to right-handed shooters come with right-side bolts, while “lefty” rifles come with left-side bolts. This “standard” configuration requires the shooter to take his dominant, trigger-pulling hand off the stock to cycle the bolt, then re-position his hand on the stock, and “re-claim” the trigger. Often the shooter must lift or move his head to work the bolt, and that also requires him to re-establish his cheek weld after each and every shot. Not good.

This really doesn’t make much sense for precision shooting with fore-end support*. There is a better way. If you leave your trigger hand in position and work the bolt (and feed rounds) with the opposite hand, then you don’t need to shift grip and head position with each shot. All this requires is a weakside-placed bolt, i.e. a left bolt for a right-handed shooter or a right bolt for a left-handed shooter. The video below shows a “Lefty” working a right bolt. Note how efficient this is:

As our friend Boyd Allen explains: “If you think about it, if you are going to work with a factory action where your options are left bolt and left port or right bolt and right port, and you are building a rifle that will only be shot from a rest, using the left/left for a RH shooter or using a right/right for a LH shooter works better than the conventional configuration”.

Shoot Like a Champ and Work the Bolt with Your Weakside Hand
Derek Rodgers is a recent F-TR World Champion, a King of 2 Miles champion, AND is the only person to have won BOTH the U.S. F-Open and the U.S. F-TR National Championships.

And guess what? Derek runs this kind of “opposite” bolt set-up. Yep, Derek shoots right-handed with a left bolt. Though Derek is a right-hander, he shoots with a Left Bolt/Left Port (LBLP) action. He pulls the trigger with his right index finger, while working the left-side bolt with his left (weakside) hand. This allows him to stay in position, and maintain his cheekweld. He places his right hand on the grip, while manipulating the bolt (and feeding rounds) with his non-trigger-pulling hand.

Recent F-TR World Champion and King of 2 Miles Derek Rodgers
left port McMillan Rifle Derek Rodgers

This is the rifle with which Derek won the 2013 F-TR National Championship.
left port McMillan Rifle Derek Rodgers

*For true standing, off-hand shooting (whether in competition or on a hunt), a conventional strongside bolt placement makes sense, since the non-dominant arm must support the front of the rifle all the time. When shooting from bipod or rest, it’s a different story.

Permalink - Articles, Competition, Shooting Skills, Tech Tip 2 Comments »
August 10th, 2023

The Wind Book for Rifle Shooters — Improve Wind-Reading Skills

wind reading book Camp Perry Miller Cunningham

“The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.” — William Arthur Ward

Readers often ask us: “Is there a decent, easy-to-comprehend book that can help my wind-reading?” Many of our Forum members have recommended The Wind Book for Rifle Shooters by Linda Miller and Keith Cunningham.

New Edition — Hardback and eBook
The latest, updated edition of The Wind Book for Rifle Shooters was released in May 2020. This 144-page book, first published in 2007, is a great resource. But you don’t have to take our word for it. If you click this link, you can read book excerpts and decide for yourself. When the Amazon page opens, look below the book cover photo, and click the bar labeled “Read Sample”. This lets you preview chapters from the Wind Book, and view some illustrations. Along with the new hardback edition ($22.99), Amazon offers a Kindle (eBook) edition for $14.99.

Other books cover wind reading in a broader discussion of ballistics or long-range shooting, such as Applied Ballistics for Long-Range Shooting by Bryan Litz. But the Miller & Cunningham book is ALL about wind reading from cover to cover, and that is its strength. The book focuses on real world skills that can help you accurately gauge wind angle, wind velocity, and wind cycles.

All other factors being equal, it is your ability to read the wind that will make the most difference in your shooting accuracy. The better you understand the behavior of the wind, the better you will understand the behavior of your bullet. — The Wind Book for Rifle Shooters

The Wind Book for Rifle Shooters covers techniques and tactics used by expert wind-readers. There are numerous charts and illustrations. The authors show you how to put together a simple wind-reading “toolbox” for calculating wind speed, direction, deflection and drift. Then they explain how to use these tools to read flags and mirage, record and interpret your observations, and time your shots to compensate for wind.

I believe this is a must-have book if you are a long-range sport shooter. I compete in F-Class Open and when I first purchased this book and read it from cover to cover, it helped me understand wind reading and making accurate scope corrections. Buy this book, read it, put into practice what it tells you, you will not be disappointed. — P. Janzso

If you have one book for wind reading, this should be it. Whether you’re a novice or experienced wind shooter this book has something for you. It covers how to get wind speed and direction from flags, mirage, and natural phenomenon. In my opinion this is the best book for learning to read wind speed and direction. — Muddler

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August 9th, 2023

Five Fun Printable Targets for National Shooting Sports Month

august month fun printable game sports bingo dart board fly shoot Target

August is National Shooting Sports Month. The goal is to enjoy time at the range and also introduce new folks to the fun and challenge of pistol, rifle, and shotgun shooting. To help our readers enjoy August days at the range, we’ve included a set of six fun targets. These PDF targets are free to print and use.

august month fun printable game sports bingo dart board fly shoot Target

While AccurateShooter.com focuses on high accuracy shooting, probably 95% of rifle shooting is done for fun at targets inside 200 yards. Shooting at targets just for fun is actually very engaging and enjoyable. Here are five targets that offer an entertaining challenge for a fun day at the range with friends.

Here are FIVE FUN Targets for your next range trip.
Right Click Each to Download Printable PDF Version.

Fly Shoot Grid

fly shoot free target pdf

fun printable game sports bingo dart board fly shoot TargetAim for the 10 flies in boxes one by one, top to bottom rows. Then, for more challenge, aim for the 7 small black circles, using the vertical and horizontal lines to align your cross-hairs.

For a final, tough challenge with an accurate rifle, try to hit the small yellow inner circle in the very center of the three radiation hazard symbols (see right). That central circle is smaller than a bullet-hole, providing a serious challenge.

Dart-Board Target

With this fun Dart-Board Target, aim for the four outer bullseyes, then go for the center bull. The colored darts provide additional targets. With an accurate rifle you can also aim for the colored stripes.

NSSF Billiards Table Target

shooting paper printable billiard cue ball stripes solids target

This Billiards Table Target offers 15 brightly-colored numbered balls with the cue ball at the bottom. Aim for the numbers, shooting 1-15 in sequence, or alternate between stripes and solids. You can also draw an “X” on the white cue ball (or attach a paster), and use that to set your zero. This target is fun for shooting outdoors with rifles at 50 or 100 yards or indoors with pistols.

Poker Target — Get the Best Hand

Dots Target
With this playing card-themed target, each shooter takes five shots and the one with the highest hand wins. You can also shoot for four-of-a-kind, against the clock, fastest four (without a mistake) wins.

Five Bull Challenge Target for August

Dots Target

This colorful NSSF target has five different bullseyes. Use it at closer ranges with pistols, or at 100-200 yards with rifles. Start with the center bull then shoot the four smaller bullseyes.

National Shooting sports month free targets

Permalink Handguns, Shooting Skills 1 Comment »
August 9th, 2023

Shooting at Indoor Ranges — Proper Range Procedures

Safety Video NSSF Indoor Range Etiquette

August is National Shooting Sports Month. Many indoor ranges are offering promotional specials this month. Range sessions may be reduced in price (or free) and you’ll find discounts on guns, ammo, and accessories. Shooting indoors is fun, and at many indoor ranges you can shoot in the evening after work. But when shooting indoors you should always be extra careful. Follow all key gun safety practices and adhere to proper range “Etiquette”. We also recommend double hearing protection — plugs under muffs.

The NSSF (NSSF) offers a useful Range Safety and Etiquette video. This 8.5-minute video explains safe practices, especially at indoor ranges. In the video, the moderator list the basic rules of gun safety, before covering key range etiquette topics such as range officer commands, how to uncase your firearm on the range when you first arrive, and what to do if a firearm is accidentally dropped. There are also safety tips specific to handling both semi-automatic handguns and revolvers.

Safety Video NSSF Indoor Range Etiquette

BAD RANGE BEHAVIOR — Five Things NOT to Do at the Range

Here are the five worst behaviors we’ve seen at indoor ranges. These behaviors are both dangerous and inconsiderate. Any one of these behaviors can get you permanently banned from an indoor range.

1. Sweeping other individuals after loading a weapon behind the firing line is very bad. All your weapons should be empty until you reach your shooting station.

2. Turning the handgun sideways while trying to clear a malfunction or insert/remove a magazine. This will point the muzzle at a fellow shooter. Or, after shooting a gun, the shooter fails to clear the weapon and then places the gun somewhere near the shooting station with the muzzle in an unsafe position.

3. Reacting unpredictably when firing a high recoil handgun. We’ve seen people take a second shot by accident with the muzzle way off target.

4. Not obeying range commands — in particular continuing to shoot during called cease-fires.

5. Poorly aimed shooting that hits target frames or carriers, causing ricochets.

Seven Types of People at the Gun Range — HUMOR

This video is satire, but with lots of truth in the characterizations. Laughter guaranteed.

Double-Up on Hearing Protection When Shooting Indoors

Howard Leight Impact Pro Electronic Muffs NRR 30

When shooting rifles and pistols indoors we recommend quality muffs with earplugs underneath, offering double protection. When inside an enclosed range, with other shooters blasting away right next to you, you really need effective hearing protection. But you also need to hear range commands and be able to communicate with your fellow shooters. That’s why we recommend electronic muffs with plugs underneath.

Howard Leight Impact Pro Electronic Muffs NRR 30

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August 8th, 2023

17 HMR for Prairie Dog Safaris — Effective at Shorter Ranges

Volquartsen 17 HMR Dustin Ellermann 17 HMR

We know our many of our readers enjoy Prairie Dog varminting safaris. For long P-Dog shots you’ll definitely want a centerfire. We like the 20 Practical in an AR and a 22 BR/BRA in a bolt-action. That will have you covered out to 700 yards. But for shorter shots on small critters — say inside 150 yards — it makes sense to have an accurate 17 HMR rimfire rig. Today’s 17 HMRs are capable of surprising accuracy, rivaling a good centerfire rig, but with way less recoil and much lower cost per shot. And the 17 HMR offers more than double the velocity of a .22 LR — up to 2650 fps with a 17-grain bullet.

Top Shot former Champion Dustin Ellerman likes his Volquartsens, and we can see why. With one of his favorite 17 HMR rimfire varmint rigs, he’s seen some outstanding accuracy with CCI ammo. A few seasons back, on his Facebook page, Dustin reported: “Prepping for prairie dogs and I’m floored by this cold, sub-half-inch group shot with the Volquartsen Custom 17 HMR at 100 yards.” This thumbhole-stock rifle features a Bowers Group USS suppressor, and 3-12x56mm Meopta Scope. Dustin tried different types of CCI 17 HMR ammo. This small group was shot with CCI A17 ammo.

Volquartsen 17 HMR Dustin Ellermann 17 HMR

What’s the effective range of a 17 HMR on prairie dogs? You might be surprised. in 2015, Dustin took another Volquartsen 17 HMR on a Prairie Dog hunt in Wyoming. He was impressed with the rifle (shown below) and the little rimfire cartridge. Dustin says the effective range of the 17 HMR is farther than one might expect: “I made hits out to 300 yards. 200 yards was easy as long as the wind wasn’t too bad.”

Here’s the Volquartsen 17 HMR Dustin used in Wyoming in 2015:
Volquartsen 17 HMR Dustin Ellermann 17 HMR

After that 2015 P-Dog expedition, Dustin became a fan of the 17 HMR cartridge: “Never paid it much attention before now because the ammo is five times more expensive than .22 LR and I mostly target shoot. However, for prairie dogs, the 17 HMR is amazing!” Consider this — Hornady’s 17 HMR ammo pushes a 17gr V-Max bullet at 2550 fps, twice as fast as typical .22 LR rounds.

Prairie Dog Adventure with Savage A17

This video shows a successful Prairie Dog hunt. Watch and you’ll see hits out to 160 yards (00:50), proving the effective range of the 17 HMR cartridge. The host is shooting a Savage A17 semi-auto 17 HMR rifle in a Boyds laminated stock.

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August 8th, 2023

Eliminating Parallax Errors — Nightforce Optics Tech Tip

Nightforce Optics Parallax Newsletter Scope Video
Nightforce Optics Parallax Newsletter Scope Video

PARALLAX – What is it and Why is it important?

Nightforce Optics Parallax Newsletter Scope Video

What is Parallax?
Parallax is the apparent movement of the scope’s reticle (cross-hairs) in relation to the target as the shooter moves his eye across the exit pupil of the riflescope. This is caused by the target and the reticle being located in different focal planes.

Why is it Important?
The greater the distance to the target and magnification of the optic, the greater the parallax error becomes. Especially at longer distances, significant sighting error can result if parallax is not removed.

How to Remove Parallax
This Nightforce Tech Tip video quickly shows how to remove parallax on your riflescope.

While keeping the rifle still and looking through the riflescope, a slight nod of the head up and down will quickly determine if parallax is present. To remove parallax, start with the adjustment mechanism on infinity and rotate until the reticle remains stationary in relation to the target regardless of head movement. If parallax has been eliminated, the reticle will remain stationary in relation to the target regardless of eye placement behind the optic.

This Parallax Discussion first appeared in the Nightforce Newsletter. Nightforce also offers a series of Informational Videos covering a variety of topics.

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August 7th, 2023

BargainFinder 411: AccurateShooter’s Deals of the Week

AccurateShooter Deals of the Week Weekly Bargain Finder Sale Discount Savings

At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.

NOTE: All listed products are for sale to persons 18 years of age or older. No products are intended for use by minors.

1. CDNN Sports — Winchester Wildcat Xpert Scoped Rifle, $249.99

winchester wildcat xpert .22LR .22 rifle bolt-action rebate sale
With free scope and factory rebate, it’s like getting rifle for $150!

Everyone should have a handy rimfire rifle. This Winchester Wildcat Xpert bolt-action .22 LR rifle is a great trainer for a young family member. And it’s also a fun plinker for shooters of any age. Right now, with the $25 Winchester Factory Rebate, this Wildcat Xpert is just $249.99 complete with a Weaver 3-9x40mm scope and rings ($274.99 before rebate). That’s a steal on a good rifle with a nice trigger and button-rifled barrel. If you prefer a semi-auto, you can get the self-loading Winchester Wildcat for $194.99 after rebate. This has the same stock, but different action, and it does NOT come with a scope.

2. Precision Reloading — Powder Sale on Many Brands

precision reloading powder sale hodgdon alliant vihtavuori VV IMR
Large selection of popular powders in stock with discounted prices

Need powder for reloading your rifle or pistol ammo? There’s a good sale right now at Precision Reloading with popular powders up to 15% OFF. Chose among Hodgdon, Alliant, Vihtavuori, IMR, Accurate, and Winchester powders. Some hard-to-find rifle powders, such as H4831SC, Reloder 16, and VV N540 are IN STOCK now at good prices. Pistol powders are on sale too, such as Hodgdon Titegroup at just $24.41 per pound! But you need to order right away. This sale ends at 11:59 pm on August 8, 2023.

3. KYGUNCO — Savage 64 Precision Rimfire Rifle, $249.99

savage 64 precision fde flat dark earth .22 LR rimfire rifle NRL22
Great deal on good starter rifle for NRL22

Want to get started in NRL22, America’s fastest-growing type of rifle competition? Here’s a bargain-priced .22 LR rifle in a modern chassis. The Savage 64 Precision FDE features a semi-automatic action in a chassis with M-LOK slots and an ergonomic pistol grip. The heavy barrel has a threaded muzzle for easy attachment of brake, tuner, or suppressor. This is a good starting rifle for NRL22 — the semi-auto action allows fast follow-up shots. Get this rifle on sale now for $249.99.

4. Midsouth — Frankford Tumbler Lite + Depriming Tool, $119.99

Frankford Arsenal tumbler lite had depriming tool combo sale
Depriming Tool and Tumbler Work Great, save $45 with COMBO

The Frankford Arsenal Depriming Tool and Tumbler Lite are both excellent products. With the hand depriming tool you can knock out primers while watching TV. Spent primers are collected in the removable clear catch tube — so no mess on your press or loading bench. The Tumbler Lite is great for tumbling with liquid media to get your cases bright and shiny. Right now you can save $45 by getting the $119.99 Combo Pack from Midsouth.

5. EuroOptic — Leupold Spotting Scope and LRF Sale

Leupold $100 off spotting scopes rangefinder laser
Save $100 on quality Leupold Spotting Scopes and Rangefinders

Right now Leupold is offering $100.00 “instant savings” on SX-4 HD Spotting Scopes and RX-Fulldraw 5 Laser Rangefinders. You save immediately when you order — no rebate forms to fill out. This $100 savings is offered at multiple vendors including EuroOptic, Brownells, Sportsman’s Warehouse, and MidwayUSA. We recommend EuroOptic as it offers free shipping with orders over $250.00 plus excellent customer service.

6. Precision Reloading — Rifle and Pistol Primers on Sale

winchester 41 primers small rifle mil-spec precision reloading
Quality primers for ARs and rifles at attractive price

Top-quality primers are still pricey and in very high demand. Thankfully, Precision Reloading has a large supply of Federal, CCI, and Remington primers in stock at competitive prices. And yes the popular CCI 450 and CCI BR-4 primers are in stock. AR shooters should check out the Winchester #41 small rifle primers which work great in ARs and bolt guns. These #41 primers are just $79.99/1000 while supplies last.

7. Midsouth — Starline Pistol Brass in Stock

starline brass .45 9mm 10mm .357 40 sw
Excellent pistol brass for popular cartridge types, good value

Starline offers some of the best pistol brass you can buy — all made here in the USA. Right now Midsouth has a big inventory of Starline brass IN STOCK at attractive prices. If you need hard-to-find brass, such as .357 Sig or .45 ACP +P, Starline has that. And prices are attractive. For example, Starline’s regular 9mm Luger brass is just $21.99 per 100 cases at Midsouth.

8. Amazon — Midland-EX37VP Radio Kit (Set of 2), $49.99

walkie talkie radio sale
midland emergency walkie talkie radio NOAA sale
Quality Walkie-Talkies with good range and special Emergency functions

Having a good 2-way communication system is vital when hunting or wilderness hiking. And a pair of walkie-talkies really helps during shooting practices when a buddy goes downrange to set targets. A very good 2-Way radio system is the Midland-EX37VP E+Ready Emergency Two-Way Radio Kit. These walkie-talkies have a 26 mile range and feature 22 FRS (Family Radio Service) channels, along with channel scan. With this kit you get vital E+Ready Emergency functionality, plus NOAA weather alerts.

9. Amazon — KRATE AR500 Steel Targets, $16.99 and Up

double rifle case sale
Tough AR500 steel gongs, excellent user reviews, lifetime warranty

KRATE offers quality, durable AR500 steel targets, starting at just $16.99 for a 4″ Gong. KRATE AR500 targets have a lifetime warranty, and have earned good user reviews. These Tactical AR500 Steel Gongs are 3/8″ thick and come in various sizes set up for hanging chains (sold separately). And get this, right now if you spend at least $25, your Gongs ship for FREE! Along with Gong targets, KRATE also sells AR500 steel silhouette targets through Amazon.

10. Amazon — Large Digital Display Timer, $13.95

shooting sale gun timer
Use in Matches — Count-Down or Count-UP, handy big buttons

If you shoot in a discipline with time limits, or you time your firing strings during practice, having a reliable and easy-to-read timer is critical. One of our favorite timers is this very affordable Digital Display Timer with both count-up and count-down functions. It boasts an easy-to-read display and LARGE buttons making it perfect for F-Class, Palma, and other matches. This timer comes with both a built-in stand AND a strong magnet so you can position the timer conveniently.

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August 7th, 2023

Twist Rate and Stability — Correcting Common Misconceptions

FirearmsID.com barrel rifling diagram

Understanding Twist: Bullet Stabilization

by Sierra Bullets Ballistic Technician Paul Box for Sierra Bullets Blog.

Based on the questions we get on a daily basis on our 800 (Customer Support) line, twist is one of the most misunderstood subjects in the gun field. So let’s look deeper into this mystery and get a better understanding of what twist really means.

When you see the term 1:14″ (1-14) or 1:9″ twist, just exactly what does this mean? A rifle having a 1:14″ twist means the bullet will rotate one complete revolution every fourteen inches of the barrel. Naturally a 1:9″ turns one time every nine inches that it travels down the barrel. Now, here’s something that some people have trouble with. I’ve had calls from shooters thinking that a 1:14″ twist was faster than a 1:9″ because the number was higher with the 1:14″. The easiest way to remember this is the higher the number, the slower the twist rate is.

Now, the biggest misconception is that if a shooter has a .223 with a 1:8″ twist, his rifle won’t stabilize a 55gr bullet or anything lighter. So let’s look at what is required. The longer a bullet is for its diameter, the faster the twist has to be to stabilize it. In the case of the .223 with a 1:8″ twist, this was designed to stabilize 80gr bullets in this diameter. In truth the opposite is true. A 1:8″ will spin a 55gr faster than what is required in order to stabilize that length of bullet. If you have a bullet with good concentricity in its jacket, over-spinning it will not [normally] hurt its accuracy potential. [Editor’s Note: In addition, the faster twist rate will not, normally, decrease velocity significantly. That’s been confirmed by testing done by Bryan Litz’s Applied Ballistics Labs. There may be some minor speed loss.]

FirearmsID.com barrel rifling diagram
Many barrel-makers mark the twist rate and bore dimensions on their barrel blanks.

Think of it like tires on your truck. If you have a new set of tires put on your truck, and they balance them proper at the tire shop, you can drive down a street in town at 35 MPH and they spin perfect. You can get out on the highway and drive 65 MPH and they still spin perfect. A bullet acts the same way.

Once I loaded some 35gr HP bullets in a 22-250 Ackley with a 1:8″ twist. After putting three shots down range, the average velocity was 4584 FPS with an RPM level of 412,560. The group measured .750″ at 100 yards. This is a clear example that it is hard to over-stabilize a good bullet.

Twist-rate illustration by Erik Dahlberg courtesy FireArmsID.com. Krieger barrel photo courtesy GS Arizona.
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