The State of the Art in Rifle Bullet Stability

Overview The modern rifle is named for the spiral grooves cut in the barrel which impart a spin to the bullet. Spinning imparts gyroscopic stability, which is what keeps the bullet flying point forward. Longer bullets need to spin faster than shorter bullets to achieve stability. For many years, the relative proportions of bullets haven’t changed much, and so the twist rate of riflings has sort of stagnated around standard values. However in recent times, technology is advancing to the point where higher performance (longer) bullets can be made with greater precision, and so the thoughtful consideration of twist rate and stability is becoming important. [...]

Effects of Cartridge Over All Length (COAL) and Cartridge Base To Ogive (CBTO) – Part 2

Cartridge Base To Ogive (CBTO) The first half of this article focused on the importance of COAL in terms of SAAMI standards, magazine lengths, etc.  There is another measure of length for loaded ammunition which is highly important to precision. Figure 2. Chamber throat geometry showing the bullet jump to the rifling or lands. Refer back to Figure 2.  Suppose the bullet was seated out of the case to the point where the base of the bullet's nose (ogive) just contacted the beginning of the riflings (the lands) when the bolt was closed.  This bullet seating configuration is referred to as touching the [...]

Effects of Cartridge Over All Length (COAL) and Cartridge Base To Ogive (CBTO) – Part 1

Many shooters are not aware of the dramatic effects that bullet seating depth can have on the pressure and velocity generated by a rifle cartridge.  COAL is also a variable that can be used to fine tune accuracy.  It's also an important consideration for rifles that need to feed rounds thru a magazine.  In this article, we'll explore the various effects of COAL, and what choices a shooter can make to maximize the effectiveness of their hand loads. Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) Most loading manuals (including the Berger Manual), present loading data according to SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) standards.  [...]

Our New Twist Rate Calculator; A How To Guide

The information in this guide is no longer relevant. Our newest version of our twist rate stability calculator has a how to guide built into it. You can find the new version of our twist rate calculator here. Click the orange "for more information" text to find the new guide.

“Accuracy and Precision for Long Range Shooting” by Bryan Litz

Bryan Litz, Berger Bullets' Chief Ballistician, is proud to announce his latest offering to the long range shooting community. In his second book, Bryan helps shooters understand some of the theories behind practical shooting and discusses techniques to improve hit percentages. He says, "Accuracy and Precision for Long Range Shooting is written in the same layman's terms as Applied Ballistics for Long Range Shooting. The book focuses on defining the elements of accuracy and precision in a systematic way, and exploring their independent affects on hit percentage. The material is intended to help shooters make more informed decisions about their equipment and training. Ultimately, the [...]

Form Factors: A Useful Analysis Tool

Background In 2009, Berger Bullets introduced G7 BC's for boat tail bullets. For those who are unfamiliar with G7 BCs, it's simply a Ballistic Coefficient referenced to the G7 standard projectile instead of the G1 standard projectile. The G7 standard is a better match for modern long range bullets, so the G7 BC will be more constant over a wide range of velocities compared to a G1 BC. Please refer to article: https://bergerbullets.com/a-better-ballistic-coefficient/ for the complete explanation of the benefits of using G7 BC's. Since 2009, many shooters have realized the benefits of G7 BC's thru more accurate trajectory predictions. The objective of this article [...]

Bullets to be Discontinued

One of our greatest challenges is growing our capacity to handle the fact that we are blessed with constantly increasing demand. One of the ways that we are dealing with this situation is to discontinue bullets that are not popular. This frees up precious capacity and reduces the number of set ups we must process. The following bullets will be discontinued due to low sales: 22 cal 50 gr Target (Alternative = 22 cal 52 gr) 22 cal 62 gr Varmint (Alternative = 22 cal 60 gr or 22 cal 64 gr) 6mm 62 gr Target (Alternative = 6mm 62 gr Euwin) 6mm 66 gr [...]

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