DRVT — DRAG VARIABILITY REDUCTION TECHNOLOGY
Using Doppler radar and Schlieren imagery, Hornady engineers have developed and patented Drag Variability Reduction Technology (DVRT) to increase the uniformity of bullet drag from shot to shot, resulting in less dispersion at long range.
While analyzing thousands of Doppler radar drag curves, Hornady’s ballisticians isolated a bullet tip design that would reduce the variation in drag from bullet to bullet. Specifically, the meplat must be flat – not pointed – and the diameter of the flat meplat is a specific ratio to the bullet diameter. Tests showed that a flat end of the bullet tip provided more consistent drag.
Upon refinement of this design feature in late 2018, DVRT was implemented into all bullets using the Heat Shield Tip and the A-Tip Match bullet. While DVRT was patent pending, shooters quietly benefited from this design for several years. Now with the patent issued, Hornday has published the details of Drag Variability Reduction Technology on its website. And the hour-long Hornady Podcast embedded below explains how DVRT was developed from extensive field research with Doppler radar.
Bullets with Drag Variability Reduction Technology:
Do you own or shoot an AR-platform “black rifle”? Then you know these rifles run dirty, and have some unusual maintenance requirements. On the other hand, the AR “Modern Sporting Rifle” is fun and versatile with a vast range of options among buttstocks, barrels, handguards, and grips. You can assemble a simple 16″ barrel .223 Rem rig for home defense, or build a long-barreled 6mm ARC rifle with bag-rider buttstock and high-magnification optic for long range target work. The choice is up to you.
To help with your black rifle journey, here are eight helpful videos from Brownells. These will help ensure your AR rifle cycles reliably and runs longer, with reduced wear. Brownells also explains how to choose the optimal barrel twist rate. CLICK HERE to order AR parts, accessories, and ammo from Brownells.
AR Bolt/Bolt Carrier Lubrication — Smarter Methods
This video shows the proper way to lubricate an AR-15 bolt-carrier assembly. The video identifies the key metal-on-metal friction points where you actually need lubrication: the rails on the underside of the carrier, shiny wear points on top, and just a dab on the cam pin. How much oil/lubricant should you use? The AR-15 is pretty forgiving on that point. Some spots work best with grease, others work best with a lighter oil. Just keep it out of the combustion areas. Those little holes in the carrier are gas vent holes, NOT oil holes!
AR Maintenance — General Cleaning Procedures
Let’s face it, ARs with the original gas system tend to run dirty. You’ll need to regularly clean the bolt carrier and bolt. In addition you should regularly clean the chamber area and the inside of the upper. Also make sure to clean the lower (see video 3:15) and ensure the trigger assembly is properly maintained. This video covers general cleaning and maintenance of AR-platform rifles. We highly recommend that all new AR owners watch this video. NOTE: When cleaning the bolt, don’t forget the extractor recess and ejector recess. The majority of ARs we’ve seen that did not function properly had gunk (lube, carbon, brass shavings) clogging these areas.
AR Barrel Twist Rates — What You Need to Know
AR barrels can be ordered with a variety of twist rates from 1:12″ to 1:7″. Basically, the longer/heavier the bullet you plan to shoot, the faster the twist rate you need. For example, Sierra recommends a 1:7″ twist rate for the 90gr SMK. A 1:12″ could work with the small lightweight bullets up to 55 grains. The 1:9″ barrel will stabilize the light and mid-weight bullets up to about 77 grains. We recommend a 1:8″ or 1:7″ twist rate for the best versatility. You’ll find a detailed discussion of AR twist rates on PewPewTactical.com.
How to Install an AR15 Trigger Assembly
One of the most common AR upgrades done by black rifle owners is swapping out the trigger for a better unit (perhaps a two-stage). Trigger replacements on ARs can be done fairly easily with basic tools. But there are some recommended procedures to ensure the trigger group swap goes easily. You’ll want to have a proper mount to secure the lower, and tools that fit the pin diameters on your lower.
AR Rifle Build — How to Avoid Common Mistakes
This Brownells video explains five common yet serious errors people make while assembling or modifying AR-15 class rifles. Here are the five mistakes all AR builders need to avoid:
1. Mounting Accessories that Contact the Gas Block: A common mistake is attaching accessories like bipods directly to the handguard in such a way that screws exert pressure on the gas block. This misalignment can harm accuracy. The solution involves carefully selecting the attachment point or opting for shorter screws.
2. Incorrect alignment of the Gas Block: This is another widespread issue. Properly aligning the gas block with the barrel’s gas port is essential for the rifle’s reliable operation. Misalignment can lead to cycling problems due to insufficient gas flow.
3. Over-Torquing the Castle Nut: Applying excessive torque to the castle nut can damage the threads of the receiver extension, also known as the buffer tube. The recommended torque setting is 40 foot-pounds. Exceeding this value can compromise the structural integrity of these components.
4. Excessive Material Removal in Upper Receiver Lapping: Removing too much material when lapping the upper receiver, can cause the barrel to sit too far into the upper receiver. This misplacement can affect feed ramp alignment and gas block positioning, potentially leading to functional issues.
5. Improper Buffer Tube Installation: Failing to install the buffer retainer and spring correctly, or screwing the buffer tube in excessively, can obstruct the upper receiver’s closure. Correct installation depth is crucial for these components to perform their intended functions.
Checking Headspace on ARs
In this Tech Tip, Brownells gun tech Steve Ostrem walks users step-by-step through the process of checking headspace on their AR-15 rifles, both new and used. It is very important to have proper headspace to ensure proper feeding and extraction, and to ensure good brass longevity (with less risk of dangerous case separation). Starting at 2:10, this video explains how to check headspace with go/no-go gauges and maximum headspace gauge. Ostrem notes: “If you have an AR that closes on a no-go gauge, we recommend taking it to a gunsmith before heading to the range.”
Excessive headspace in AR platform rifles can lead to dangerous case separation.
Setting Up Gas Tube Systems
This Tech Tip examines AR-platform gas systems, and shows how to select the proper length gas tube, and how to configure multiple tube systems if you change your barrel to different lengths. This is worth watching for anyone re-barreling an AR.
Barrel Gas Block Alignment — Key to Reliable Cycling
In this video, Brownells gun tech Steve Ostrem explains surefire methods to align your gas block. The most common problem with AR builds is poor cycling, commonly caused by misalignment between the gas block and the barrel’s gas port.
Federal offers advanced Syntech ammunition with polymer-encased projectiles. Federal Syntech Ammo is the first range-specific factory-loaded ammunition designed to reduce fouling and extend barrel life with a high-tech polymer bullet coating plus specially-formulated clean-burning powders. The potential for reduced wear and fouling is real. When tested against conventional FMJ ammunition, Federal claims Syntech pistol ammo produced 12% less barrel friction and 14% less heat. Also, since Syntech bullets lack a metal jacket, there is less chance of ricochets on steel targets.
Syntech user reviews have been highly positive:
Syntech ammo does what it says, I’ve tested it. Barrel stays cooler, easier to clean without lead or copper fouling. Extremely reliable — the Syntech coating aides in the feeding cycle.
This my favorite ammo for shooting steel plates. Makes a terrific sound when hitting. Far less barrel cleaning after a day of shooting.
Great range ammo. Clean pistols less often.
Federal now offers Syntech ammunition in 9mm Luger, .40 S&W, 10mm Auto, and .45 ACP. These four chamberings are offered in various bullet weights with both round-nose and flat-nose bullet options. The best value we found is a 500-round case of 124gr 9mm Luger for $239.99 at MidwayUSA.
For years this Editor has loaded his .45 ACP and .44 Mag handguns with polymer/moly matrix-coated bullets from Precision Bullets in Texas. Those poly/moly-encased lead bullets shot VERY accurately and I found that my barrels fouled much less than with conventional lead bullets. Likewise, there was much less cylinder fouling on my revolvers. If the American Syntech bullets work as well as those Precision bullets, we think the Syntech line will be a winner. Syntech bullets should benefit any shooter who frequents a range where conventional lead ammo is not allowed.
Features & Benefits
• Polymer-encapsulated Syntech bullet prevents metal-on-metal contact in the bore, eliminating copper and lead fouling, while extending barrel life.
• Exclusive primer formulation provides reliable, consistent ignition.
• Clean-burning propellants minimize residue and fouling.
• Significantly reduces the required frequency of cleaning.
• Absence of a copper jacket minimizes splash-back on steel targets.
NRA Warns Against Booking and Advertising Scams at NRA Annual Meetings & Exhibits
The 153rd NRA Annual Meetings and Exhibits in Dallas, Texas takes place May 16-19, 2024. As the event draws near, the NRA emphasizes the importance of vigilance against predatory practices in the Tradeshow Industry. Exhibitors and attendees should be wary of various deceptive tactics, spanning from tradeshow services to hotel accommodations, attendee lists, and advertising claims. While some offers may be genuine, many are scams that could lead to financial loss without the promised services or outcomes. Some of the most common scams include:
1. Hotel Rooms/Fake Booking Agents: For the 2024 show, the NRA has partnered with ConferenceDirect as the Official Housing Partner for the Annual Meetings. Scammers may impersonate legitimate hotel representatives or housing bureaus, offering discounted rates to exhibitors and attendees. However, these offers often result in nonexistent reservations or subpar accommodations. CLICK HERE for official NRA Annual Meeting Hotel Reservation Site.
2. Advertising Sales: Scammers lure exhibitors with false promises of exposure through publications, event guides, or online platforms, exaggerating their reach and effectiveness. Some vendors misrepresent advertising channels and ROI, persuading exhibitors to purchase ad space based on misleading claims.
3. Attendee List Sales: Beware of scammers claiming access to comprehensive attendee lists and offering to sell this data to exhibitors. The NRA does NOT sell or distribute attendee lists for the Annual Meetings, so any such offer is a scam.
To avoid falling victim to scams, attendees should:
1. Only use NRA Official Partners
2. Exercise caution with unsolicited offers
3. Do NOT provide personal or financial information without verification
When in doubt, contact the NRA Shows and Exhibits Division to verify that offers or solicitations are from Official Partners. By remaining informed and vigilant, exhibitors and attendees can safeguard themselves.
MAP for Hutchison Convention Center Area in Dallas
Q: What’s more important — wind speed, or direction?
A: Obviously they both matter, but they do trade dominance based on direction. For example, a 10 mph wind between 2:30 and 3:30 is only changing its value from 9.7 to 10 to 9.7 mph (bracket of 0.3 mph). However a 10 mph wind between 11:30 and 12:30 is changing its cross wind component value from 2.6 mph left to zero to 2.6 mph right (bracket of 5.2 mph). There is the same 30° change in direction, but this results in a massively different bracket.
Point being, in this case, a direction change is far more critical if it’s near 6 or 12 o’clock. A small direction change when it’s close to 3 or 9 o’clock is negligible.
On the contrary, a change in wind SPEED when it’s near 3 or 9 affects your crosswind component directly. But for a near head or tail wind, a fluctuation in wind speed only causes a small fraction of a change to the crosswind component.
SUMMARY: If you’re in a near full-value wind, pay more attention to wind SPEED. If you’re closer to a head- or tail-wind, nailing the exact DIRECTION will be more important.
Get More Tips on Bryan Litz Ballistics Facebook Page
This post is from the new Bryan Litz Ballistics Facebook Page. FB users should check that page regularly for more tips from Bryan, American’s leading ballistics expert and founder of Applied Ballistics LLC.
2024 marks the 25-year anniversary of Project ChildSafe®, the firearm safety and education program of NSSF®, The Firearm Industry Trade Association. Since its inception, Project ChildSafe has raised awareness about safely handling and securely storing firearms when not in use, along with educating children about firearm safety. Marking this milestone, NSSF aims to raise $250,000 over the next year to provide more free gun locks and educational materials to gun owners across the country.
Project ChildSafe Has Distributed over 40,000,000 Gun locks
Started in 1999, Project ChildSafe began in just five cities in the USA. Now it has grown to serve all 50 states and the five U.S. territories. To date, Project ChildSafe has distributed more than 40 million safety kits, which include a cable-style gun-lock and educational brochures. The firearm safety kits are distributed through partnerships with more than 15,000 local law enforcement agencies and 13,000 organizational partners.
Click image for larger version (easier to read small print).
“For 25 years, Project ChildSafe has operated on both the national and local levels to provide genuine firearm safety solutions to communities that need them most,” said Joe Bartozzi, NSSF President and CEO. “Since its launch, fatal firearm accidents have dropped to historic lows. The program also aims to prevent firearm thefts and suicide.” Bill Brassard, NSSF Communications director added: “[O]ver the years we’ve heard stories firsthand of how our safety kits have saved lives by preventing accidents and suicides[.]”
To mark 25 years of Project ChildSafe, NSSF hopes to raise $250,000 in funding for the program over the next year. Individual supporters and organizations are invited to donate to Project ChildSafe. Project ChildSafe is a 501(c)(3) tax-exempt nonprofit organization, and all donations to the organization are tax deductible to the extent allowed by law.
Larry Vickers is a respected firearms trainer who has served with the U.S. Special Operations Forces (SOF). In the course of teaching classes he’s learned that many gun owners waste money on impractical gun accessories. In a well-reasoned Ammoland.com article, “Don’t Be a Tacti-Cool Fool”, Vickers examines today’s trend of over-accessorizing firearms, particularly AR-platform rifles. Vickers doesn’t mince words… he states that too many people are spending too much money on poorly-designed hardware that may be “useless” at best.
Equipment Selection Advice from Larry Vickers
Every class I teach I see and hear students talking about the realization that some things about their gear and shooting in general just doesn’t add up on the range. Everything looks good in a Brownells Catalog but a significant amount of the parts and accessories offered on the market today are: a) useless; b) poorly designed; c) of questionable value; or d) downright dangerous.
No one is better at taking fully-functional, factory-made firearms and turning them into junk than a certain segment of the American gun-buying public.
Some people really don’t apply the common sense approach of not messing with what is potentially a life-saving tool. Sadly some of those same people will get on the Internet and talk bad about how the firearm they modified no longer functions and therefore is junk. Or they will recommend to fellow shooters the same parts and modifications they have used to turn their gun into, at best, a range toy.
Some of this shows up in my classes and usually by lunch on the first day the obvious flaws of the equipment at hand become apparent for everyone in the class, most of all to the owner of said equipment. It may have cost the shooter some money but in turn he learned a serious life lesson –be careful what you read on the Internet about firearms modifications and there is no substitute for shaking out your equipment at the range in a structured class.
I’ve said it before and I’ll say it again: you’ll learn more about guns and shooting in one class than you could in a month on the Internet.
READ about guns, gear, and shooting on the Internet. LEARN about guns, gear, and shooting on the range during well-thought-out and useful training. This approach is proven and consistently produces results and shooter confidence.
In this 51-minute video Larry Vickers responds to questions about gun accessories, his favorite firearms, sensible prepping, and other topics of interest.
Larry Vickers is a retired U.S. Army Special Operations Forces veteran with 20+ years of service. Vickers served in Panama, the Middle East (Desert Storm), Somalia, Bosnia, and other locations. During his time with Delta Force, Vickers worked on weapons R&D, and served as a combat marksmanship instructor training new operational members of Delta.
Here’s something all shooters need — a smartphone App that calculates bullet-hole group sizes from your own photos. The Ballistic-X App is simple to use. Take a photo of your target, set some values (such as bullet diameter and distance to target), then use the touchscreen to place circles around each hole. The App will calculate group size (in MOA or Mils), distance to point of aim, and provide all the info in an overlay. Then click “save” to record your group for posterity!
This App works well, is relatively easy to set-up, and costs just $7.99. It is available for both Android devices and iOS (Apple) devices. There are other ways to measure group sizes from target images, such as the excellent On-Target program, which we have used for years. However On-Target requires a software installation on a Windows platform desktop or laptop. Ballistic-X is a simple, easy-to-install App with versions for both Android and iOS (Apple) Mobile devices.
The Ballistic-X App has a relatively easy-to-use interface. Of course you can choose either MOA or Milrad group values, and Inch or Metric dimensions. There are various labeling options that provide useful info for Load Development. There is even an ATZ (Adjustment To Zero) feature for adjusting your turrets.
How to Use Ballistic-X App
1. Select Photo Source — Choose Camera to take new photo or get image from Photo Library.
2. Set Reference Values — Select Bullet Diameter and enter Distance to Target.
3. Establish Scale on Image — Mark two points on target photo to set scale. For example, if the target has a 1″-square grid lines, mark two points on grid for 1″ distance.
4. Mark Point Of Aim — Put the central X on the aim point.
5. Designate Shot Locations — Place the green circles around each shot.
6. Finalize Data Display — Position Overlay, select size/color options, and export file.
Android Options — Range Buddy FREE App
Along with Ballistic-X, there is another Mobile App, Range Buddy, that also measures shot groups. Range Buddy is currently offered for Android devices only. It is FREE, but has adverts. Range Buddy isn’t bad, but users complained about the program crashing, and there are compatibility issues with newer phones. We recommend you pay $7.99 and stick with Ballistic-X.
Every Tuesday an interesting technical feature is posted on the Applied Ballistics Facebook Page. For today’s 4/23/24 “Tech Tuesday”, a fascinating video of a bullet in flight was posted. This Schlieren video illustrates a 6mm 109gr Berger LRHT bullet traveling at 3163 FPS. The stunning video reveals the bullet shockwave and the turbulent wake. Check it out:
About the Schlieren Imaging Process — What It Shows
Schlieren Imaging is a way of making airflow features visible. 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.
Above is a second Schlieren imaging video. This shows a 6mm 109gr Berger LRHT bullet at ~2800 fps as fired from a 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).”
Science of Accuracy Exclusive Content for Subscribers
Applied Ballistics has a huge archive of shooting-related ballistics and technical information plus exclusive videos. You can access all this information plus great members-only podcasts by subscribing to the Science of Accuracy Academy for $9.95/month.
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.
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.
