The .338 Lapua Magnum is renowned for its exceptional long-range accuracy and power, making it a favorite among military snipers and precision long-range shooters. Understanding its precise dimensions is crucial for proper ammunition handling, reloading, and firearm compatibility. This guide provides a detailed look at the .338 Lapua Magnum cartridge dimensions, clarifying key specifications and their significance.
Key Cartridge Dimensions of the .338 Lapua Magnum
The .338 Lapua Magnum's dimensions aren't simply about numbers; they dictate its ballistic performance, firearm compatibility, and overall effectiveness. Here's a breakdown of the critical measurements:
Case Dimensions:
- Overall Length: Approximately 2.83 inches (72 mm) This dimension is crucial for magazine compatibility and overall firearm function. Variations can exist slightly depending on the manufacturer and bullet type.
- Case Length: Approximately 2.26 inches (57.4 mm). This specifies the length of the cartridge case itself, excluding the bullet. Accurate case length is essential for consistent reloading.
- Base Diameter: Approximately 0.625 inches (15.87 mm). This is the diameter of the cartridge case at its base, affecting the fit in the firearm's chamber.
- Neck Diameter: Approximately 0.375 inches (9.5 mm). The neck diameter is the part of the case that holds the bullet. Accurate neck sizing is essential for proper bullet seating during reloading.
- Shoulder Diameter: This is a key dimension impacting chamber pressure and overall cartridge performance. While precise numerical values can vary based on source and manufacturer tolerance, the shoulder angle and diameter play a critical role in maintaining optimal function.
Bullet Dimensions:
The bullet's dimensions are equally important and significantly affect the cartridge's ballistic performance. Factors to consider include:
- Bullet Diameter: .338 inch (8.64 mm). This is the diameter of the projectile itself, determining its flight characteristics and its ability to engage a target.
- Bullet Length: This varies widely depending on the specific bullet design and weight, ranging from under 1 inch to over 1.5 inches. The bullet's length influences ballistic coefficient (BC) and overall accuracy.
- Bullet Weight: Bullet weight ranges from around 250 grains to over 300 grains, significantly influencing the .338 Lapua Magnum's energy and trajectory. Heavier bullets tend to have a higher ballistic coefficient, providing better long-range accuracy.
Understanding the Significance of Dimensions
Slight variations in these dimensions can have a significant impact on the functionality and safety of the cartridge. Incorrect dimensions can lead to:
- Feeding Problems: Improper case length or base diameter can result in failure to feed or chamber correctly.
- Headspace Issues: Inconsistent case dimensions can create dangerous headspace issues, potentially causing catastrophic failure.
- Accuracy Issues: Inaccurate neck sizing and bullet seating can drastically impact accuracy.
- Pressure Issues: Incorrect dimensions can lead to excessive chamber pressure, posing a safety hazard.
Resources for Accurate Information
For the most precise and up-to-date information regarding .338 Lapua Magnum cartridge dimensions, it's recommended to consult reputable ammunition manufacturers' specifications and reloading manuals. Always prioritize safety and precision when handling ammunition. This data is for informational purposes and should not be considered a substitute for consulting official documentation from trusted sources.
