Before you load that new cartridge brass for the first time, run an expander mandrel down the case necks. This will iron out dents and provide more uniform neck tension. Chose a mandrel diameter that provides appropriate neck tension.

Lapua brass is so good that you’ll be tempted to just load and shoot, if you have a “no-turn” chamber. However, some minimal case prep will ensure more uniform neck tension. Keeping your neck tension very uniform allows more consistent bullet seating. That, in turn, usually yields better accuracy, and lower Extreme Spread and Standard Deviation (ES/SD). Lapua brass, particularly 6mmBR, 6.5×47, 6.5 Creedmoor, and .308 Win comes from the factory with tighter-than-optimal necks.

Before you seat bullets, at a minimum, you should inside chamfer the case mouths, after running an expander mandrel down the necks. The expander mandrels from both Sinclair Int’l (Brownells, $14.99 stainless, $24.99 Titanium Nitride coated) and K&M will both leave the necks with enough neck tension (more than .001″) so you can then seat bullets without another operation. We suggest putting a bit of lube on the mandrel before running it down the necks — but remove any lube that gets inside the necks before seating bullets. If you do a lot of loading you may benefit from a Titanium Nitride-coated mandrel.

Both Sinclair and K&M Tools make a die body specifically to hold expander mandrels. The $61.99 Sinclair version fits caliber-specific expander mandrels which measure approximately .001″ less than bullet diameter for each caliber. This is an updated “Gen II” design that completely captures the mandrel within the die so the mandrel cannot pull out. It also has an O-ring in the die cap that allows the mandrel to self-center within the case neck. Brownells offers two sizes of Sinclair die bodies for expander mandrels: .17 -.338 caliber (#749011715 $61.99); and .357 – .50 caliber (#749008843, $49.99). All Generation II dies are machined from stainless steel and the standard diameter 7/8-14 dies include the Sinclair Stainless Steel Split Lock Ring.

Once you run the expander mandrel down the necks of Lapua brass, after you account for brass spring-back, you’ll have about .002″ neck tension*. This will make the process of seating bullets go much more smoothly, and you will also iron out any dents in the case mouths. Once the case mouths are all expanded, and uniformly round, then do your inside neck chamfering/deburring. The same expander mandrels can be used to “neck-up” smaller diameter brass, or prepare brass for neck-turning.

Forum member Mike Crawford adds: “These expanders can also reduce runout from offset seating. Prior to bullet seating, expand the sized necks to force thickness variance outward. With the Sinclair system, the necks will springback fine, and will not be pulled out of center. This leaves plenty of tension, and bullets seated more centered. I do this, even with turned necks, to get improved seating.”

Mandrels vs. Expander Balls on Decapping Rods
If you haven’t acquired an appropriate expander mandrel for your brass, but you DO have a full-length sizing die with an expander ball, this will also function to “iron out” the necks and reduce tension. However, using a die with an expander ball will work the necks more — since you first size them down, then the ball expands them up again. Typically (but not always), run-out is worse when using an expander ball vs. an expander mandrel.

* This .002″ tension is what we have observed with Lapua 6mmBR, 6.5×47, 6.5 Creedmoor, and .308 Win brass. This might vary with much smaller or larger cases, and of course a different brand of brass might yield different results. If you get too little tension with your current mandrel, you can get a smaller-diameter mandrel from 21st Century Innovation, with stainless, Black Nitride, or Titanium nitride versions. The Nitride models have less friction.

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.

Brownells — Clearance Sale + Save 20% with Code EXTRA20

⏺️ » Deals on guns, ammo, optics, and gear plus 20% OFF Code

Get major savings with the Brownells Clearance Sale. Along with the already discounted prices, on many of these clearance items you can save an additional 20% with Code EXTRA20. Sale items include rifle scopes, pistols, bipods, shooting rests, ammo (rifle, pistol, shotgun), cartridge brass, bullets (Berger, Sierra, Hornady), reloading equipment, rifle cases and more. Definitely check out this Clearance Sale. There are exceptional deals plus 20% savings. Or, if you can’t use the 20% Off code you can get FREE Shipping for orders over $99 with Code FREESHIP99.

MidwayUSA — RCBS Reloading Tools Sale

⏺️ » RCBS reloading equipment and tools with big savings

If you need a press, reloading scale, dies, or other loading tools, definitely check out the major RCBS Sale running now at MidwayUSA. They have everything RCBS on sale, including Presses, Combo Reloading Kits, ChargeMaster Electronic Scale/Dispensers, Priming tools, Mechanical scales, Dies and more — all priced to move. There are very significant savings, up to 25%. For example the innovative RCBS Summit Press is $75 off, a 20% savings while a RockChucker combo reloading kit is $125 off, also 20% discount.

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Updated 18th Edition with Feature Articles
The latest 18th Edition of Cartridges of the World includes cartridge specs, plus tech articles on Cartridge identification, SAAMI guidelines, wildcatting, and new cartridge design trends. Cartridges of the World, the most complete cartridge reference guide in print, includes a full-color section with feature articles on new 7mm Cartridges, PRC Cartridges, 9mm Cartrdige, and a special feature on Gun Safes.

View Free Book Sample Content
FREE STUFF for You: If you want to see what you are getting, there is a very large sample section of the 18th Edition available online with over 100 pages of content and dozens of photos and illustrations. To access all this FREE INFO, CLICK HERE, then look for the cover photo and click below the cover photos where it says “Read Sample”. It may take a few moments to fully load the sample pages. NOTE: This content is primarily from the Kindle digital 18th Edition.

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.

Brownells — Clearance Sale + Save 20% with Code EXTRA20

⏺️ » Deals on guns, ammo, optics, and gear plus 20% OFF Code

Get major savings with the Brownells Clearance Sale. Along with the already discounted prices, on most of these clearance items you can save an additional 20% with Code EXTRA20. Sale items include rifle scopes, Colt Pistols, bipods, shooting rests, ammo (rifle, pistol, shotgun), cartridge brass, bullets (Berger, Sierra, Hornady), reloading equipment, rifle cases and more. Definitely check out this Clearance Sale. There are exceptional deals plus 20% savings.

MidwayUSA — Big Game Hunting Sale, Large Product Selection

⏺️ » Major discounts on optics, accessories, ammo and free 100+ shipping

If you need hunting gear and ammo, check out the Big Game Hunting Sale over at MidwayUSA. Here you’ll find deep discounts on everything you’ll need for your next hunt. You’ll find major savings on rifle scopes, spotting scopes, trail cams, field tripods, tree-stands, walkie-talkies, boots and other hunting gear. In addition, a huge selection of hunting ammunition from Barnes, Federal, Hornady, Nosler, Remington and Winchester is ON SALE. Plus, MidwayUSA is offering FREE Shipping on $100+ orders.

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Garmin Acquires Applied Ballistics LLC
There was big news this week in the shooting industry. Garmin Ltd. has acquired Applied Ballistics LLC, the company founded and run by Bryan Litz, a top software engineer, ballistics guru, and world-class rifle shooter. Applied Ballistics has developed some of the most sophisticated and accurate ballistics software. It can run on your computers and tablets, and Applied Ballistics software has also been integrated into mobile devices, rangefinders, and Kestrel Weather Meter wind reading units.

To mark this important development for Applied Ballistics, today we feature eight notable videos. These include NSSF “Elements of Long Range Shooting” videos hosted by Bryan Litz of Applied Ballistics. In that multi-part series, Bryan covers a variety of topics of interest to precision shooters. Watch other informative Long Range Shooting and Ballistics videos with Bryan Litz on the NSSF YouTube Channel.

Understanding Muzzle Velocity

In this 55-minute video Bryan Litz explains how to measure muzzle velocity with various chronograph types and then explains some methods for optimizing your ES/SD. Bryan explains: “Muzzle velocity is an important variable for long range shooters. This video covers some key concepts for beginners and also goes into some advanced topics that are not normally encountered to keep it interesting for experienced shooters as well.”

How to Employ AB Quantum Software

This video is a very useful guide on getting started with AB Quantum™. Bryan Litz demonstrates the essential setup process: 1) quickly building an accurate profile; 2) establishing your zero, and 3) verifying the data at 100 yards. The proof is on the target. After creating a new ballistics profile, Bryan uses the verified profile to shoot a successful group at 1000 yards.

Powder Storage — Temperature and Humidity

In this video, Bryan Litz offers very helpful advice on how to store powder properly to ensure that you do not experience unpredictable velocities and higher-than-normal ES/SD. You want to keep your powder in a location which avoid high spikes in temperature and humidity. In addition powder bottles should not be stored in a thick-walled gun safe.

Bullet Ballistic Coefficients

A bullet’s ballistic coefficient (BC) basically expresses how well the bullet flies through the air. Higher BC bullets have less aerodynamic drag than lower BC projectiles. You will see BCs listed as either G1 and G7 numbers. These correspond to different bullet shape models. Generally speaking, the G7 model works better for the long, boat-tail bullets used for long-range shooting. Notably, a bullet’s drag is NOT constant in flight. The true BC can vary over the course of the trajectory as the bullet velocity degrades. In other words, “BC is dynamic”. That said, you can make very accurate drop charts using the BCs provided by major bullet-makers, as plugged into solvers. However, long-range competitors may want to record “real world” drop numbers at various distances. For example, we’ve seen trajectories be higher than predicted at 500 yards, yet lower than predicted at 1000.

Big Boomers — Large-Caliber Rifles for Long Range

Bryan Litz defines “Large Caliber” as .338 caliber and bigger. These rifles can shoot heavy bullets with high BCs. That’s great for ELR shooting. However there are trade-offs. It can be hard to maintain good fundamentals of marksmanship (trigger control, sight alignment) when you’re fighting heavy recoil and burning 100+ grains of powder. Accordingly, Bryan recommend a muzzle brake with any cartridge .338 or above. Also, when considering lathe-turned solid bullets, remember that these typically have less sectional density compared to lead-cored bullets with similar profiles. This affects ballistics as well as recoil energy.

BONUS: Bryan Litz Interview with Erik Cortina

Bryan Litz is arguably the leading ballistics expert on planet earth. A talented shooter who has won major F-Class, ELR, and Palma matches, Bryan is a high-IQ scientist who has developed the ballistics software many of us now use in Kestrels and other devices to calculate scope clicks with extreme precision. In this interview, Bryan explains basic ballistics principles and also corrects some popular misconceptions. This is a great interview that has received much praise from viewers, one of whom has noted: “Bryan is a walking science lab. He puts out amazing data-based info[.]” With 107,000 views, this is Erik Cortina’s second-most popular video ever.

TEN Shots in 0.303″ (0.289 MOA) at 100 Yards
Look at that target showing TEN shots at 100 yards, with eight (8) shots in the main cluster at the top. The ten-shot group measures .303″ (0.289 MOA), as calculated with OnTarget Software. Not bad for a handgun — a very nice bolt-action XP-100 pistol! What do you think, can your best-shooting rifle match the 10-shot accuracy of this XP-100 pistol?

Report by Boyd Allen
This story goes back a few seasons… this remarkable XP-100 pistol belongs to Dan Lutke, a Bay Area benchrest shooter who publishes the results for the Visalia matches to the competitors and the NBRSA. He has been an enthusiastic competitor for an number of years, at various ranges, notably Visalia and Sacramento. The action is a Remington XP-100, to which a Kelbly 2 oz. trigger has been fitted. On top is an old Japanese-made Tasco 36X scope (these were actually pretty darn good). The Hart barrel (a cast-off from Dan’s Unlimited rail gun) was shortened and re-chambered for the 6x45mm, a wildcat made by necking-up the .223 Remington parent case. The custom stock/chassis was CNC-machined by Joe Updike from 6061 Billet Aluminum to fit the XP-100 action and mount a target-style AR grip with bottom hand rest. The gun was bedded and assembled by Mel Iwatsubu. In his XP-100 pistol, Dan shoots 65gr custom boat-tails with Benchmark powder.

This diagram shows the most common 6x45mm wildcat, which is a necked-up version of the .223 Remington parent cartridge. NOTE: The dimensions for Dan Lutke’s benchrest version of this cartridge may be slightly different.

ACAD drawing by Peter Gnanapragasam CC by SA 3.0, via Wikimedia Commons. Title Added.

Many short-range Benchresters have thought about converting their 6 PPC rig to shoot a 30BR for score matches, or a Dasher for mid-range (or even 1000-yard) games. That way you can have a rifle that does double (or triple) 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.

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

Do you often carry a concealed handgun? Then you can benefit from Beretta’s FREE 15-page e-book, Ten Essential Tips for CCW Holders. This eBook, in handy PDF format, helps gun owners select an appropriate handgun (and holster), understand legal obligations and responsibilities, and train effectively with the firearm. This short PDF eBook offers many useful tips to consider, in particular for gun owners who are contemplating the pros and cons of everyday carry for themselves.

CLICK HERE for 10 Essential Tips for CCW Holders »

As the Beretta CCW booklet says, “Carrying a concealed handgun requires a certain amount of confidence. You need to be confident in your knowledge of laws and regulations. You have to have confidence in your accuracy, and you need to trust that you can carry a gun effectively, securely and comfortably. If a gun is a burden for you to carry, you probably won’t.”

Surprising Facts About Actual Defensive Handgun Use
You may be surprised to learn when and how handguns are actually used for self-defense. Most defensive uses are at very short range and the incident only lasts a matter of seconds. You need to be prepared, and train to be proficient drawing and aiming your weapon. And remember, shooting is a last resort, when a safe retreat is not available.

55% of gunfights take place in 0-5 feet.
20% of gunfights take place in 5-10 feet.
20% of gunfights take place in 10-21 feet.
95% of gunfights take place in 0-21 feet. (Source: FBI)
The average man can cover 21 feet of ground in 1.5 seconds.
The average gunfight is over in 3-5 seconds.
3 to 4 shots are usually fired.
Most gunfights take place in low-light conditions.
On average, one shot in four strikes someone.

Here are two (2) sample pages from Beretta’s CCW eBook.

For many Americans, real incomes have stayed flat in recent years, while inflation has increased the cost of living very significantly in since 2020. Accordingly, it’s important to save money whenever possible. Prices are going up, but wages aren’t following (for most of us). Here are six ways shooters can save money on gear purchases and other shooting-related expenses.

1. Watch for Our Deals of the Week. Every Monday, in our Daily Bulletin, AccurateShooter.com offers some of the best deals to be found. We search the web to find great deals on ammo, reloading components, optics, tools, firearms, gun safes, electronics and more. It’s not unusual to find savings of 20-35% through our Deals of the Week. And many of our vendors are now offering special deals just for AccurateShooter.com readers.

2. Check Out the Forum Classifieds. There are great deals to be found every day in the AccurateShooter Shooters’ Forum. The latest deals are displayed in the right column of every Forum page. To see all the listings, browse through the Forum MarketPlace section which has four main categories:

• Guns, Actions, Stocks, & Barrels
• Tools, Dies, Rests, Reloading Components & Misc
• Scopes, Optics, Sights, Rings, Bases Etc.
• Commercial Sales by Paid Sponsors

3. Share a Ride to Matches. Fuel prices are on the rise — Regular-grade gasoline is over $6.05 per gallon in California now and around $4.33/gallon nationwide. With many shooters living 30-100 miles from the nearest range, fuel remains a big part of a shooter’s hobby budget. We’d say 90% of shooters drive solo to matches, often in large, gas-guzzling trucks. If you drive 200 miles round-trip to attend a match in a 20-mpg vehicle, you’ll burn over $43.00 worth of gasoline on your trip. That adds up. By simply sharing the ride with one fellow shooter you cut your fuel expenditures in half. And, if you alternate vehicles with a buddy from one match to the next, you save on vehicle wear and tear. At $0.84/mile (average overall operating costs for an SUV) consider the savings.*

4. Use Discount Codes to Save. It’s always smart to check for discount codes before you buy. In the Daily Bulletin, we feature “Deals of the Week” every Monday morning, and we provide discount Coupon Codes when available. These can reduce the price substantially or lower shipping costs. Search codes for Brownells, Creedmoor Sports, EuroOptic, Graf’s, Midsouth, Powder Valley, Sportsman’s Warehouse, KYGUNCO, MidwayUSA, and Precision Reloading. Check your email also — some discount codes are only announced in email newsletters. If you can’t find a Coupon Code for your preferred vendor, visit Gun.deals and/or RetailMeNot.com. Both those sites list current coupon codes, and RetailMeNot.com covers thousands of vendors.

5. Shop for “Demo” Optics. Modern high-quality optics can easily cost $1500.00 or more, often exceeding the value of the rifle on which they are mounted. However, you can often save 20-30% by purchasing demo optics. These are normally display units used at trade shows. They may have slight ringmarks, but otherwise they are “as new”, having never been carried in the field or used on a rifle that has fired live ammo. When purchasing demo scopes, you should always ask about the warranty before consummating the sale. However, most demo scopes from name-brand manufacturers come with full factory warranties. EuroOptic.com and SWFA.com are two respected vendors that offer a good selection of demo optics.

6. Train with Rimfire Rifles. Good match-grade centerfire, hand-loaded ammo, counting premium bullets, powder, primers, and brass (figuring 10X loads), can now exceed $1.60 per round. And if your $600 (as chambered and fitted) competition barrel is toast after 1500 rounds, add $0.40 for barrel deprecation per shot. So you’re effectively spending two bucks a round total! By contrast, you can get quite good .22 LR target ammo for under $0.18 per round. Good rimfire barrels last a long, long time, so you don’t have to be concerned about wearing out your barrel quickly. A quality rimfire barrel can retain its accuracy for 7,000 rounds or more. If you run the ballistics, a .22 LR round at 100 yards can emulate the wind drift experienced by a centerfire cartridge at long range. This allows for effective cross-training with much less expensive ammo.

Ever wondered what the air around a moving supersonic bullet really looks like? Check out this video from the Bryan Litz Ballistics Facebook page. This is a Schlieren video* of a 6mm 109gr Berger LRHT bullet at about 2800 fps as fired from Francis Colon’s PRS rifle at the Applied Ballistics Lab.

Bryan Litz notes: “You can clearly see the compression (shock) wave at the front of the bullet. A compression wave is formed when the air has to move faster than the speed of sound to get out of the way, which is certainly the case for this bullet which is moving about 2.5 times the speed of sound (Mach 2.5).

That shock wave is the ‘snap’ you hear when bullets fly past you if/when you’re downrange. Also, compressing the air into a shockwave takes energy, and that energy comes directly out of the forward velocity of your bullet and gets converted into heat and noise as the shock wave forms and dissipates.

The turbulent wake at the base of the bullet shows where/how base drag applies. The third and smallest component of drag for a supersonic bullet is skin friction drag, which is a viscous boundary layer effect, and is the least visible in this image. So as you head to the range or the hunting stand, think about the absolute violence your bullets are committing in the atmosphere, before they even reach the target!”

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