The Federal Premium 308 Winchester 168 Grain Sierra MatchKing BTHP is a popular choice among long-range shooters for its accuracy and consistent performance. Understanding its ballistics is crucial for achieving optimal results at various distances. This post will delve into the ballistics of this specific ammunition, exploring factors that influence its trajectory and providing insights for accurate shot placement. Note that the data presented here is based on typical performance and may vary slightly based on barrel length, twist rate, atmospheric conditions (temperature, pressure, humidity), and even the specific lot of ammunition. Always conduct your own testing to determine the precise ballistics for your specific setup.
Understanding the Key Ballistic Factors
Before diving into the data, it's essential to understand the key ballistic factors influencing projectile flight:
- Muzzle Velocity: The speed at which the bullet leaves the barrel. This is a critical factor influencing range and trajectory. Variations in muzzle velocity significantly impact downrange accuracy.
- Ballistic Coefficient (BC): A measure of a bullet's ability to overcome air resistance. A higher BC generally indicates less air resistance and a flatter trajectory. The Sierra MatchKing boasts a relatively high BC for its weight class.
- Trajectory: The path the bullet follows from the muzzle to the target. Understanding trajectory is vital for accurate long-range shooting, necessitating adjustments for bullet drop and wind drift.
- Wind Drift: The horizontal deflection of the bullet caused by wind. Wind drift increases with distance and is influenced by wind speed and direction.
- Energy Retention: The amount of kinetic energy the bullet retains at various distances. Sufficient energy retention is crucial for effective target impact and penetration.
Illustrative Ballistics Chart (Approximate Values)
Disclaimer: The following chart presents approximate ballistic data based on standard conditions. These values can and will vary depending on the factors mentioned earlier. Always reference your own chronograph data and ballistic software for precise calculations tailored to your specific rifle and environmental conditions.
| Distance (Yards) | Velocity (fps) | Energy (ft-lbs) | Drop (inches) | Wind Drift (10 mph, 90 degrees) (inches) |
|---|---|---|---|---|
| 100 | 2600 (approx.) | 2400 (approx.) | -2 | 2 (approx.) |
| 200 | 2350 (approx.) | 1950 (approx.) | -10 | 8 (approx.) |
| 300 | 2100 (approx.) | 1600 (approx.) | -25 | 18 (approx.) |
| 400 | 1850 (approx.) | 1300 (approx.) | -50 | 32 (approx.) |
| 500 | 1600 (approx.) | 1050 (approx.) | -85 | 50 (approx.) |
| 600 | 1350 (approx.) | 800 (approx.) | -130 | 72 (approx.) |
Note: This data is for illustrative purposes only and may not reflect the exact performance of your specific setup. Wind drift is highly variable and depends on wind speed, direction, and angle. Bullet drop is also influenced by environmental conditions and the specific ballistic coefficient of the ammunition lot.
Utilizing Ballistic Data for Accurate Shooting
Accurate long-range shooting requires meticulous attention to detail and a thorough understanding of ballistics. To utilize this data effectively:
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Utilize Ballistic Software: Programs like Strelok Pro or JBM Ballistics allow you to input your specific rifle characteristics (barrel length, twist rate), ammunition data, and environmental conditions to generate more precise ballistic data.
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Conduct Zeroing Procedures: Properly zero your rifle at various ranges to account for bullet drop and trajectory variations.
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Account for Environmental Factors: Always consider temperature, pressure, humidity, and wind conditions when making shot adjustments.
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Practice and Refinement: Consistent practice is key to mastering long-range shooting. Regularly track your shot groups and make necessary adjustments to your technique and aiming points.
Conclusion
The Federal Premium 308 168 Grain Sierra MatchKing BTHP is a capable round for long-range shooting, but understanding its ballistics is critical for success. Remember that the data provided here is approximate. Always conduct your own testing and use appropriate ballistic software to generate personalized data for your specific firearm and environment. By understanding and applying this knowledge, you'll improve accuracy and consistency on the range.
