## Sierra Ballistics Resources — 60+ Authoritative Articles for FREE

Need some informative reading material for winter days? Here’s a vast resource available free from Sierra Bullets. Here are links to over 60 articles with information on bullets, ballistic coefficients, wind drift, up/down angles, temperature effects, tailwind effects and much more. Most of these resources come from the respected Sierra Reloading Manuals, 4th and 5th Editions. There are enough articles to read one per week for a year!

**Major Ballistics Reference Articles**

The Ballistic Coefficient by William T. McDonald & Ted C. Almgren (Adobe .PDF)

Deflections and Drift of a Bullet in a Crosswind by William T. McDonald (Adobe .PDF)

Inclined Fire by William T. McDonald

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**5th Edition Manual Exterior Ballistics Section**

Section 1.0 Introduction

Section 2-2.1 The Ballistic Coefficient Explained

Section 2.2 Bigger Is Not Always Better

Section 2.3 How the Ballistic Coefficient is Measured

Section 2.3.1.1 Measurement Procedure

Section 2.3.1.2 Important Precautions and Points to Consider

Section 2.3.2 Initial Velocity and Time of Flight Method

Section 2.3.3 Doppler Radar Method

Section 2.4 Lessons Learned from Ballistic Coefficient Testing

Section 2.5 Examples of Ballistic Coefficient Measurements

Section 3.0 Exterior Ballistic Effects on Bullet Flight

Section 3.1 Effects of Altitude and Atmospheric Conditions

Section 3.2 Effects of Wind

Section 3.3 Effects of Shooting Uphill or Downhill

Section 3.4-3.4.1 Trajectory Considerations for Sighting in a Gun

Section 3.4.2 Determining Zero Range from Firing Test Results

Section 3.4.3 Sighting in for a Change in Shooting Location

Section 3.5 Point Blank Range

Section 3.6 Maximum Horizontal Range of a Gun

Section 3.7 Maximum Height of Fire of a Gun

Section 4.0 Six Degree of Freedom Effects on Bullet Flight

Section 4.1 Basic Physical Concepts

Section 4.2 Yaw of Repose and Resulting Crossrange Deflection

Section 4.3 Turning of a Bullet to Follow a Crosswind and Resulting Deflections

Section 4.4 Turning of a Bullet to Follow a Vertical Wind and Resulting Deflections

Section 5.0 Trajectory Tables

Section 6.0 Sierra’s Infinity Exterior Ballistics Software

**4th Edition Manual Exterior Ballistics Section**

Section 2.0 Introduction

Section 3.0 Historical Summary

Section 4.0 The Ballistic Coefficient

Section 4.1 Basic Definitions

Section 4.2 Ballistic Coefficients Effects on Bullet Trajectories

Section 4.3 How the Ballistic Coefficient is Measured by Firing Tests

Section 4.4 Lessons Learned From Ballistic Coefficient Measurements

Section 4.5 Ballistic Coefficient Variations with Muzzle Velocity near the Speed of Sound

Section 4.6 Ballistic Coefficient Dependence on Coning Motion

Section 5.0 Exterior Ballistics Topics

Section 5.1 Effects of Altitude and Atmospheric Conditions

Section 5.2 Effects of Altitude and Uphill/Downhill Shooting

Section 5.3 Wind Effects

Section 5.3.1 Headwinds and Tailwinds

Section 5.3.2 Crosswinds

Section 5.3.3 Winds from Any Direction

Section 5.4 Changing the Zero Range

Section 5.5 Point Blank Range

Section 5.6 Muzzle Velocity Dependence on Cartridge Temperature

Section 6.0 Equations of Bullet Flight

Section 6.1 Differential Equations of Bullet Motion

Section 6.2 Drag Force and the Drag Function

Section 6.3/Section 6.3.1 Siacci’s Method/The Change of Independent Variables

Section 6.3.2 The Assumption

Section 6.4 Mayevski’s Analytical Form of the Drag Model

Section 6.5 Closed-Form Solutions for Trajectory Parameters

Section 6.6 Other Useful Equations

Section 6.6.1 References