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May 26th, 2012

Berger Bullets Recalls One Lot of “6mm BR Column” Bullets

Berger 6mm BR column bulletIf you purchased Berger’s “6mm BR Column” bullets recently, check your lot number on the box. Berger Bullets has recalled lot number 4192 of 6mm BR Column bullets (Berger item #24407). If you have this lot number please contact Berger at (714) 447-5425, and Berger will ship you high-quality replacement bullets. We are not sure why these bullets are being recalled, but rest assured that Berger will provide high-quality replacements promptly. Note: It is known that part of lot number 4192 was originally shipped to Powder Valley.

About the 6mm BR Column Bullet Design
Berger’s “6mm BR Column” bullets were created for short-range (100-300 yards) benchrest applications. This name does not mean the bullet is designed just for the 6mm BR cartridge. Rather it is designed for all 6mm short-range benchrest (BR) rifles, most of which are 6 PPCs (for group shooting at least). The “Column” in the name comes from the fact that Berger optimized the height of the lead core column inside the bullet. Testing revealed that bullets which had very uniform core column heights shot more accurately and were also easier to tune. Berger says the new 6mm BR ‘Column’ projectiles started shipping in mid-March, 2012.

Permalink Bullets, Brass, Ammo, News No Comments »
May 4th, 2012

New 250gr Berger .338-Caliber OTM ‘Tactical’ Hybrid Bullets

Berger OTM tactical 338 caliber 250 grain bulletBerger Bullets has released a new, 250-grain .338 caliber Hybrid OTM Tactical bullet. This is a slippery projectile, with an impressive .349 G7-model Ballistic Coefficient (.682 G1 BC). This new bullet gives Berger TWO heavyweight .338-cal bullets in its line-up — Berger already offered a 300gr OTM Tactical Hybrid with a .419 G7 BC, and a whopping .818 G1 BC. Berger tells us: “The .338-Cal 250gr and 300gr Hybrid OTM Tactical bullets were optimized for use in the .338 Lapua Magnum cartridge, but will work great in other cartridges as well.”

The new .338 cal, 250gr Hybrid was designed by Bryan Litz. The new 250-grainer’s Hybrid design blends a tangent ogive with a secant ogive. These blended shapes yield outstanding ballistic performance, yet the blended Hybrid design is normally less “finicky” about seating depth position than are secant-ogive, VLD-style bullets. Hence less load tuning should be required with the Hybrids compared to VLD designs. According to Bryan, these thick-jacket OTM Tactical bullets have been optimized for specific cartridges. They should be successful at either magazine-feedable lengths or loaded long for single-shot firing situations, which can allow for more powder capacity and higher velocities.

Berger OTM tactical 338 caliber 250 grain bullet.338 Cal Hybrids for Long-Range Hunting?
While Berger officially says that the new 250gr Hybrid and its larger 300gr cousin are “not recommended for hunting”, large .338-caliber bullets with similar construction, such as the Sierra 300gr Match King, have been used successfully by long-range hunters for many years. One experienced hunting guide told us: “This combination of bullet diameter and bullet weight has proven to be a very effective on elk and other large game.” Berger’s 250gr and 300gr OTM Hybrids offer a higher BC option than other bullets in this caliber and weight ranges. Berger does plan, in the future, to offer .338 caliber 250-grain and 300-grain Hybrid Hunting bullets.

Loaded Ammo with new .338 Hybrids Available from Bryan Litz
Bryan Litz’s ammunition business, Applied Ballistics Munitions, now offers loaded .338-caliber ammo for two cartridges: .338 Edge and .338 Lapua Magnum. This ammo (for both cartridge types) is offered with your choice of either the 300gr OTM Hybrid or the new 250gr and 300gr OTM hybrid. If you’re not familiar with the .338 Edge, this is a 300 Remington Ultra Magnum necked-up for the .338 bullet. The .338 Edge has become popular with long-range hunters.

Story tip from EdLongrange. We welcome reader submissions

Permalink Bullets, Brass, Ammo, New Product 5 Comments »
May 1st, 2012

Redding Offers Retro-Fit Micrometer Stems for Standard Seaters

Redding Seating Stem MicrometerThey have been on the market for nearly a year, but you may not know that Redding sells a line of Micrometer Seater assemblies, which can be used to upgrade Redding’s standard ½-20 thread seater dies. These replacements allow you to enjoy the ease-of-use and precision of a micrometer seater, without buying a whole new die. Redding states that “the new Bullet Seating Micrometers are a direct [retro-fit] replacement for the original seating plugs and can easily be changed from one die to another.” Unfortunately, these add-on micrometer stems haven’t started shipping yet, and Redding has not provided a firm delivery date (or price). We are hoping the products will start arriving by mid-summer.

Redding Seating Stem Micrometer

NOTE: the seater assemblies are a component of the bullet seating die. These are not the dies themselves. It is the top portion of the die that contains the plunger, which pushes the bullet into the case. And here is something important: these new Bullet Seating Micrometers are available for both traditional tangent ogive bullet shapes as well as for VLD (secant ogive) bullets.

Redding Seating Stem MicrometerThat’s right, Redding now offers micrometer seater assemblies made specifically for Berger VLD bullets. These Seating Micrometers allow you to convert a standard seater to a Micrometer seater optimized for VLDs. That’s great news for VLD fans. Eric Stecker of Berger Bullets tells us: “We have confirmed with Redding that each of the new micrometer plugs in the VLD group were designed based on Berger VLD bullets. We provided all of our VLD bullets to Redding, from which they took deliberate measurements and made these new plugs.”

New VLD-specific Seater Stems Improve Bullet Seating Depth Consistency
Stecker explains how the new VLD-specific seater assemblies produce better, more accurate ammo: “Many shooters have problems getting the VLD bullets to shoot because of the bullet seater die they are using. VLD bullet noses are so long and sharp that, in many dies, the bullet tip bottoms out in the bullet seater stem instead of touching on the side of the ogive like it should. Seating depth inconsistencies up to .025″ can occur if the seater stem bottoms out on the bullet tip. The worst part is that many shooters have no idea that this is the root cause of their poor performance. This new product can help turn a frustrating shooting experience into an enjoyable one.”

Story tip from Edlongrange. We welcome submissions from our readers.
Permalink New Product, Reloading 4 Comments »
February 28th, 2012

Berger’s New 6mm "Column" Bullet for Short-Range Benchrest

Berger Bullets has released a new 6mm (.243 caliber) bullet for short-range (100-300 yards) benchrest applications. The new bullet (shown below right), is called the “6mm BR Column”. This name does not mean the bullet is designed just for the 6mm BR cartridge. Rather it is designed for all 6mm short-range benchrest (BR) rifles, most of which are 6 PPCs (for group shooting at least). The “Column” in the name comes from the fact that Berger has optimized the height of the lead core column inside the bullet. Testing revealed that bullets which had very uniform core column heights shot more accurately and were also easier to tune. Does the new “Column” bullet work? Well, noted benchrest shooter Lou Murdica has already used them to win a Two Gun Agg in Florida against “big name” competition. Thankfully, you won’t have to wait long to try these bullets out — Berger says the new 6mm BR ‘Column’ projectiles will be available in mid-March, 2012. Call Berger at (714) 447-5422 to order.

Berger 6mm BR column bullet

Bullet Characteristics — Accurate and Easy to Tune
Berger’s Ballistician and lead bullet designer Bryan Litz says this new ‘Column’ bullet should be less sensitive to seating depth: “We worked very hard to produce a bullet that has a wider ‘tuning window’ for peak accuracy. This means there may be several seating depths where it shoots well. We also expect that it can shoot well at different speed nodes, but this will be dependent on your barrel.” The estimated G1 BC for these bullets is 0.277. The meplat is 0.062″, typical of benchrest bullets in this weight class. There is a small pressure ring in the bullet. Recommended twist rate is 1:13.5″ but the bullet should stabilize in a 1:14″ twist-rate barrel.

Berger’s Eric Stecker tells us: “There have been benchrest bullets in the past which were well-known for achieving consistently small groups over a wide tune range in many rifles and loads. One example of this was the Euber bullet. The seemingly ‘magical’ performance of these bullets has been attributed to special dies, stars aligning, owl feathers, or some other unknown influence. However, Bryan Litz has found that there are specific mass balance and aerodynamic properties which allow a bullet to mitigate dispersion and shoot precisely over a wide range of imperfect launch dynamics.”

Dispersion Mitigation in Bullet Design — Bryan Litz Explains
Bryan LitzThe science of dispersion-mitigating bullets is understood, but until now, no one has ever deliberately designed a bullet that has these specific attributes. There have been other bullets which have accidentally achieved the partial effect and the resulting bullets became very well known. Three key things are required to develop an effective dispersion-mitigating bullet:

1. The knowledge required to design a dispersion mitigating bullet.  
2. A bullet-maker with the ability to fabricate the design precisely.
3. The means by which to test the bullets extensively to determine optimal configuration.

Berger’s 6mm ‘Column’ bullet is specifically designed to mitigate the component of dispersion related to alignment. Variables related to bullet/bore axis alignment include tight necks, turning necks, bullet jump, chamber concentricity, powder charge, and so on. These are all variables which will be less critical for the new Berger 6mm ‘Column’ bullet.

To be realistic, these new bullets only mitigate dispersion effects related to axis alignment, NOT aiming error, wind deflection, or poor shooting.

Four Years of Prototype Testing
Yields Superior Bullet Design

Using his knowledge of design factors that mitigate (reduce) dispersion, Berger’s bullet designer Bryan Litz went to work creating a bullet design that had a wide, forgiving tune range. This means that the bullet shoots well with a wide variety of loads and seating depths. Bryan came up with three different shapes. Then for each of these three bullet profiles, Berger tested three different core column heights to identify the truly optimal design. Over the next four years, Lou Murdica shot thousands of test rounds in the data capture phase of the project. When testing concluded, one bullet proved to be head and shoulders above the others in its ability to shoot well at the widest variety of loads and seating depths.

The prototype bullet design that shot best in Berger’s tests has entered production as the new Berger 6mm BR ‘Column’. You’ll notice that there is no listed weight. Berger doesn’t list weight because Berger learned that the bullet’s mass is not as important as the overall balance of the bullet, which is achieved with a specific internal lead column height. Due to slight variations in copper and lead material batches, one lot may weigh 64.8 gr while another lot might weigh 65.1 grains or 64.6 grains. Berger says: “So long as the column of lead is the correct height to achieve the desired balance” the bullets should perform, no matter what the average weight of a given lot of ‘Column’ bullets may be. That said, when loading for a match, you’ll want to load all your ammo with bullets from the same lot.

Berger is now accepting orders for the new 6mm BR ‘Column’ bullets. The first lots should be available around March 16, 2012. Call Berger at (714) 447-5422 for pricing info or to place an order.

Permalink Bullets, Brass, Ammo, New Product 4 Comments »
February 14th, 2012

Match Report: Berger 2012 Southwest Long Range Nationals

Report by German Salazar
The 2012 Berger Bullets Southwest Long Range Nationals fired last week at Phoenix’s Ben Avery Shooting Facility left competitors from all over the US and Canada smiling and ready to return for next year’s event. With over 200 competitors from 40 states and several Canadian provinces, this was truly a national level event and the scores reflected that intensity. However, it wasn’t just about the shooting; as at any large rifle match, renewing old friendships, seeing friends from the AccurateShooter Forum and enjoying time and a few meals with them are just as important.

Complete Individual and Team Match Results will be linked here as soon as available.
F-Open Individual Grand Aggregate (RTF) | Palma Team Results (interim) (PDF)

Berger 2012 SW Nationals

The week began on Tuesday with a wind reading clinic by Mid Tompkins who knows more about how air moves across a rifle range than just about anyone. Next in line was Wednesday’s 600-yard match, a nice warm-up for the long-range shooting to come. Thursday we got down to business with a Palma team match. The sling winners were the US National Team composed of Trudie Fay, Bryan Litz, Justin Skaret and Peter Church. In F-Open, the winning team was Team Norma/Berger composed of Larry Bartholome, John Brewer, Danny Biggs, and Jim Murphy. The winning F-TR team was the Arizona State Rifle & Pistol Assn. squad, with Warren Dean, John Chilton, Steve Lockwood and German Salazar.

Berger 2012 SW Nationals

Individual shooting resumed on Friday, Saturday and Sunday as well as one more team match at 1000 yards. Conditions throughout the week were picture perfect as cool mornings gave way to afternoons in the mid 70’s. One of the Canadian shooters mentioned that it was 35 below at home on Saturday while we were in shirt sleeves! The wind was challenging without ever being as vicious as it can be on certain days in Phoenix. More than one Eastern shooter was heard to comment that they had never seen wind as switchy as this. Overall, it tested one’s ability without reaching a level of frustration — just perfect. Trudie Fay was the overall winner in the sling category, Jim Murphy in F-Open and James Croft in F-TR, but many other shooters won cash and bullets from our generous sponsor Berger Bullets as well as many door prizes at the barbeque from Nightforce, Krieger, Leupold, Sierra and many others.

Put this match on your list for next year, it’s well worth the effort. We have 100 firing points (check out the photo below) and we’re ready to put them all to use!

Berger 2012 SW Nationals

All-Star Instructors Lead Clinic
Bryan LitzA training clinic was held on Feb. 7th (Day 1), with a true all-star cadre of instructors. The clinic started with Nancy Tompkins instructing sling shooters on proper position/shooting style, while Darrell Buell and Larry Bartholome did the same for F-TR and F-Open shooters. Mid Tompkins then conducted a lengthy wind clinic which featured a series of drills at 1000 yards to observe specific wind trends. Many shooters commented on the benefits of the exercise as well as the opportunity to get some ‘trigger time’ before the main event. Finally, Bryan Litz (photo right) gave a class on long-range ballistics.

Berger 2012 SW Nationals

Permalink Competition, News 2 Comments »
November 9th, 2011

Berger Adds 215gr and 230gr Hybrids to .30 Caliber Bullet Line

Berger bulletsRecently, Berger released two new .30 caliber Hybrid Target bullets, a 215-grainer and a 230-grainer. With this new pair of projectiles, Berger now offers .30 Cal Hybrids in weights of 155 gr, 168 gr, 185 gr, 200 gr, 215 gr, and 230 grains. These bullets use a Hybrid nose designed by Bryan Litz to optimize long-range performance and enhance “tunability”. The Hybrid nose starts with a tangent shape and transitions into a secant shape. This allows these bullets to be much less seating-depth sensitive (than the VLD) while at the same time the secant portion reduces drag (for a higher BC). Berger’s Eric Stecker: “It is my understanding that each of these [new Hybrid] bullets has the highest BC of any bullets in their weight class. Combine this with being easier to tune and what you get is six new projectiles that raise the performance bar for .30 cal rifles.”

Berger Bullets .30 Cal Hybrids

Berger Rolled Out 11 New Bullet Designs in 2011
This has been a busy year for Berger Bullets. It has introduced eleven (11) all-new projectile designs. In addition, Berger re-labeled two of its popular bullets. Here’s a summary of the new offerings:

  • 6mm 105 gr Hybrid Target
  • .30 cal 155 gr Hybrid Target
  • .30 cal 168 gr Hybrid Target
  • .30 cal 185 gr Juggernaut Target (Name change — this was formerly called the 185 gr Long Range BT.)
  • .30 cal 185 gr Hybrid Target
  • .30 cal 200 gr Hybrid Target
  • .30 cal 215 gr Hybrid Target
  • .30 Cal 230 gr Hybrid Target
  • .22 Cal 77 gr OTM Tactical (Name change — this is the same bullet as the .22 cal 77 gr BT Target, but it’s new to the Tactical line).
  • .30 Cal 175 gr OTM Tactical (designed for .308 Win to be a transonic-stable option.)
  • .30 Cal 185 gr Juggernaut OTM Tactical (designed as a transonic-stable option for the 300 Win Mag.)
  • .30 Cal 230 gr Hybrid OTM Tactical (designed as a supersonic option for the 300 Win Mag.)
  • .338 Cal 300 gr Hybrid OTM Tactical (this is the redesigned Gen 2 version.)
Permalink Bullets, Brass, Ammo, New Product 5 Comments »
October 21st, 2011

Setpoint to Offer Berger Bullets in Precision Loaded Ammunition

Setpoint Ammunition, a subsidiary of Setpoint Systems Inc., has finalized an OEM distribution agreement with Berger Bullets. The agreement allows Setpoint Ammunition to offer a selection of Berger’s precision bullets for use in custom cartridges sold on their SetpointAmmo.com website. Setpoint Ammunition will initially offer three Berger projectiles for use in their 7.62×51 / .308 WIN cartridges: 155gr Match Hybrid; 185gr Long Range BT;and 168gr Match Hunting VLD.

Setpoint Ammo Berger Bullets

Setpoint Ammo Berger Bullets“The agreement with Berger Bullets allows us to offer some of the best projectiles available for use in our precision ammunition,” said Brad Angus, President of Setpoint Ammunition. Angus went on to say that this agreement has been anticipated for some time. “Teaming with Berger has always been one of our goals. When you combine the well-known reputation of Berger Bullets with the unprecedented precision that we’ve built into our ammunition loading process, you get the best custom rifle ammunition available on the commercial market today.”

Setpoint’s Unique Manufacturing Process
The revolutionary Setpoint Ammunition ordering and manufacturing process allows customers to dictate the case, projectile, powder load and overall length of the cartridge via the online ordering system. This unique process gives consumers the ability to fine-tune their ammo to fit their specific firearm and application.

The order is relayed from the website to the manufacturing facility, where fully-automated machines (designed and built for Setpoint Ammunition by Setpoint Systems,) load and assemble the cartridges to high levels of precision. By mechanizing the entire loading process, precision and consistency are maximized. The final outcome is affordable, reliable, high-performance ammunition. (Sales packages are available for military, law enforcement and tactical security groups.)

Permalink Bullets, Brass, Ammo, New Product No Comments »
March 28th, 2011

New .308 Win (175gr) Tactical Ammo from Applied Ballistics

Applied Balllistics LLC, run by Bryan Litz, has just released new .308 Winchester Tactical Ammunition. This new ammo employs a brand-new 175gr “Tactical OTM” bullet from Berger Bullets. This new projectile is unique in that it was designed to “fly right” even at transonic and subsonic speeds. The new 175gr bullets are loaded to magazine length (2.800″) in new Lapua brass, so the ammo will fit all popular detachable box magazines in tactical bolt guns and gas guns. Bryan recommends a 1:13″ (or faster) twist barrel.

Applied Ballistics Tactical Ammo

New Tactical Ammo Has Individually-Weighed Charges and Low ES
Unlike most “factory ammo”, Bryan’s new Tactical Ammo features individually weighed charges. That’s right — the charge for each and every round is weighed before it goes in the case. As a result, the new ammo typically delivers Muzzle Velocity (MV) Standard Deviation (SD) under 10 FPS (for 10 shots). That’s a low number, on a par with quality handloads. Bryan has shot this ammo at 1000 yards through a LaRue OBR AR10-type rifle. The ammo shot under one MOA at 1000 yards. Another benefit of the weighed charges is that this allows the use of high-quality extruded (stick) powders. The stick powders are known to deliver great accuracy while being consistent through a wide temperature range.

Berger’s NEW .30 Caliber 175gr Tactical OTM Bullet
This bullet was designed by Berger Ballistician Bryan Litz specifically to optimize performance of the M118LR class of ammunition. The design objectives were to maximize BC while staying within the 2.800” COAL for magazine feeding, and the requirement for the bullet to remain stable through transonic speeds. All of these design objectives were achieved, according to Bryan. The bullet has a length-tolerant tangent ogive shape, so it is less sensitive to seating depth than secant-ogive bullets.

The BC of this bullet is 7% higher than the 175 grain Sierra MatchKing currently used in most M118LR ammunition, and 2% higher than the Hornady 178 grain option. The average G1 BC of the Berger 175gr Tactical bullet is 0.510 from 3000 to 1500 fps. The G7 BC is 0.259, and is a more accurate representation of this bullets performance over a wide range of speeds. (CLICK HERE to read about G1 vs. G7 BC.)

Applied Ballistics Tactical Ammo

The Berger 175gr Tactical OTM bullet requires a minimum twist rate of 1:13″ to be stable from the muzzle. Transonic stability was verified from a 20″-barreled LaRue OBR with a 1:11.25″ twist.

Early Tests Show Bullet Shoots GreatReport by Robert Whitley
Robert Whitley got a box of early-run 175gr Tactical bullets. He says they shoot great in his own handloads: “I just received some of the new Berger .30 cal 175gr Tactical OTM (Open Tip Match) bullets. Wow — what great bullets for the .308 Winchester! I did some range testing and these things really shoot! As you can see below, I had a 5-shot group around 0.2″ and, then, shooting prone, I produced a 20-shot group that just tore out the X-Ring.” (NOTE: these targets were shot with Robert’s handloads, not the Applied Ballistics pre-loaded ammo.)

Applied Ballistics Tactical Ammo

While the words “Open Tip Match” might lead one to believe it has a large open tip, this BTHP bullet actually has a small meplat. Robert suspects that, for this bullet’s potential tactical and military applications, it was felt the words “hollow point” should be avoided in favor of “open tip”.

Bullets Are Positioned Optimally When Loaded at 2.800″ Mag Length
These bullets were also made to be loaded at magazine feeding length in the .308 Winchester (2.800″ OAL). Robert reports: “When loaded at a 2.800″ OAL length, the bullets sit perfectly in the neck of the .308 Winchester, with the full bearing surface of the bullet up in the neck of the case, and the junction of the boat tail and bearing surface of the bullet just forward of the junction of the neck and shoulder of the case.”

If you are going to shoot these bullets and expect them to be supersonic the whole way, a 1:13″ or faster twist is recommended, and if you are going to run them at velocities where they might be subsonic/transonic, Bryan confirmed they’ll work in 1:11.25″ twist barrels. Robert notes that his company, AR-X Enterprises, carries 1:11.25″ twist Bartlein .30 Cal barrels as a regularly-stocked item in both the M24/M40/Rem Tactical contour and the Remington Heavy Varmint/Sendero contour.

Whitley concludes “This is a great offering by Berger Bullets”. While the bullets can be purchased through Berger or Berger’s dealers, the new Applied Ballistics’ loaded ammo should be ordered through Bryan’s website. The price is $40 (plus shipping) for 20 rounds.

CLICK HERE to order through the Applied Ballistics secure shopping cart.

Disclosure: Applied Ballistics LLC advertises Bryan Litz’s Ballisitics Book on this site.

Permalink New Product 3 Comments »
March 16th, 2011

Tangent vs. Secant vs. Hybrid Ogive — Bryan Litz Explains

In discussions of ballistics, you’ll see references to “tangent” and “secant” bullet shapes. We know that, for many readers, these terms can be confusing. To add to the confusion, bullet makers don’t always identify their projectiles as secant or tangent designs. This article provides a basic explanation of tangent and secant designs, to help you understand the characteristics of both bullet shapes.

Tangent Ogive vs. Secant Ogive vs. Hybrid
Most match bullets produced today use a tangent ogive profile, but the modern VLD-style bullets employ a secant profile. To further complicate matters, the latest generation of “Hybrid” projectiles from Berger Bullets feature a blended secant + tangent profile to combine the best qualities of both nose shapes. The secant section provides reduced drag, while the tangent section makes the bullet easier to tune, i.e. less sensitive to seating depth position.

Berger Bullets ballistician Bryan Litz explains tangent and secant bullet ogive designs in a glossary section of his Applied Ballistics website, which we reprint below. Bryan then explains how tangent and secant profiles can be combined in a “hybrid” design.

How Bullet Ogive Curves are Defined
While the term “ogive” is often used to describe the particular point on the bullet where the curve reaches full bullet diameter, in fact the “ogive” properly refers to the entire curve of the bullet from the tip to the full-diameter straight section — the shank. Understanding then, that the ogive is a curve, how is that curve described?

LITZ: The ogive of a bullet is usually characterized by the length of its radius. This radius is often given in calibers instead of inches. For example, an 8 ogive 6mm bullet has an ogive that is a segment of a circular arc with a radius of 8*.243 = 1.952”. A .30-caliber bullet with an 8 ogive will be proportionally the same as the 8 ogive 6mm bullet, but the actual radius will be 2.464” for the .30 caliber bullet.

For a given nose length, if an ogive is perfectly tangent, it will have a very specific radius. Any radius longer than that will cause the ogive to be secant. Secant ogives can range from very mild (short radius) to very aggressive (long radius). The drag of a secant ogive is minimized when its radius is twice as long as a tangent ogive radius. In other words, if a tangent ogive has an 8 caliber radius, then the longest practical secant ogive radius is 16 calibers long for a given nose length.”

Secant Ogive vs. Tangent Ogive

tangent Secant Ogive

Ogive metrics, and Rt/R
LITZ: There is a number that’s used to quantify how secant an ogive is. The metric is known as the Rt/R ratio and it’s the ratio of the tangent ogive radius to the actual ogive radius for a given bullet. In the above example, the 16 caliber ogive would have an Rt/R ratio of 0.5. The number 0.5 is therefore the lowest practical value for the Rt/R ratio, and represents the minimum drag ogive for a given length. An ogive that’s perfectly tangent will have an Rt/R ratio of 1.0. Most ogives are in between an Rt/R of 1.0 and 0.5. The dimensioned drawings at the end of my Applied Ballistics book provide the bullets ogive radius in calibers, as well as the Rt/R ratio. In short, the Rt/R ratio is simply a measure of how secant an ogive is. 1.0 is not secant at all, 0.5 is as secant as it gets.

Hybrid Bullet Design — Best of Both Worlds?
Bryan Litz has been developing a number of modern “Hybrid” design bullets for Berger. The objective of Bryan’s design work has been to achieve a very low drag design that is also “not finicky”. Normal (non-hybrid) secant designs, such as the Berger 105gr VLD, deliver very impressive BC values, but the bullets can be sensitive to seating depth. Montana’s Tom Mousel has set world records with the Berger 105gr VLD in his 6mm Dasher, but he tells us “seating depth is critical to the best accuracy”. Tom says a change of .005″ in seating depth “can cause the group size to increase substantially”. In an effort to produce more forgiving high-BC bullets, Bryan Litz has developed a hybrid tangent/secant bullet shape. This is explained in the illustration below.

hybrid bullet

Story sourced by Edlongrange.
Permalink Bullets, Brass, Ammo, New Product 4 Comments »
February 5th, 2011

Berger SW LR Nationals — Cool Video Report by Bryan Litz

Bryan Litz, Ballistician for Berger Bullets, has created a fantastic 10-minute video that covers the recent Berger Southwest Long-Range Nationals from start to finish. Bryan, Overall Match Winner in the Sling Division, had his still and video cameras rolling for each phase of the popular event, including the Tuesday training seminars, Wednesday’s mid-range fun match, three days of scored long-range shooting (Friday – Sunday), and the awards ceremonies. The 2011 SW Nationals was a big success, drawing 161 shooters from 12 states and even Canada. There were clear skies with 70° highs every day — welcome weather for the Snow-birds who came down to compete.

YouTube Preview Image

Video Offers “Shooter’s Eye View”
During the score matches, Bryan had multiple cameras running, with one focused through a spotting scope. This allows you to see shooting, shot-marking, and target movement in real time. If you watch carefully, you can also see bullet trace on many shots. Bryan delivers a “Shooter’s Eye View” of the match with these multiple camera sequences.

Bryan covers all the top shooters and winning teams. One of the highlights of Bryan’s video is an interview with Danny Biggs, who set a new National F-Open class record, shooting 200-15X, not once but twice (the second time in really tough conditions). Danny was shooting a 7mm RSAUM with Berger 180gr Hybrid bullets, using a Barnard action and straight-contour 1:9″-twist Krieger barrel. He was loading Hodgdon H4350 in Remington Brass. NF Benchrest scope of course.

Bryan Litz

Berger Awards 30,000 Bullets and $2,000+ in Cash Prizes
Berger did a great job sponsoring this event. Overall, Berger awarded 30,000 bullets to shooters, along with over $2,000 in cash prizes. Engineer Hat’s off to Bryan for making such a fine video. And remember… Bryan managed to shoot this video, while finishing First Overall in Sling Division. Impressive.

Bryan Litz

Permalink - Videos, Competition 3 Comments »