The term "20 MOA rail" frequently pops up in discussions about long-range shooting and precision rifles. But what exactly does it mean, and why is it important? This article will delve into the intricacies of 20 MOA rails, explaining their purpose, benefits, and considerations for shooters of all levels.
What Does 20 MOA Mean?
MOA stands for Minute of Angle. One MOA is approximately one inch at 100 yards. A 20 MOA rail, therefore, provides a 20-minute angle of elevation (approximately 2 inches at 100 yards). This built-in cant is crucial for long-range shooting.
Why Use a 20 MOA Rail?
Long-range shooting requires significant adjustments to compensate for bullet drop at extended distances. Using a 20 MOA rail offers several key advantages:
1. Increased Adjustment Range:
The primary benefit is the extended range of adjustment. By incorporating a 20 MOA cant into the scope mounting system, you effectively increase the total vertical adjustment available on your optic. This allows you to engage targets at extreme distances without running out of upward adjustment. Without a 20 MOA rail, you might reach the top of your scope's elevation adjustment before reaching the optimal zero for your chosen cartridge and distance.
2. Maximized Scope Travel:
This increased adjustment range maximizes the use of the scope's available elevation travel. You'll utilize the entire range, preserving valuable adjustments for fine-tuning at various ranges.
3. Maintaining Zero:
A 20 MOA rail allows you to maintain a consistent zero across a wider range of distances. This is especially critical for long-range shooting where even small changes in elevation can drastically affect point-of-impact.
When is a 20 MOA Rail Necessary?
The necessity of a 20 MOA rail depends heavily on several factors:
- Caliber: Larger calibers with greater bullet drop will benefit significantly more from a 20 MOA rail.
- Range: For extreme long-range shooting (beyond 600 yards), a 20 MOA rail is often essential.
- Scope: The amount of vertical adjustment built into your scope impacts the need for a rail. Scopes with limited elevation adjustment will require a 20 MOA rail more than those with extensive vertical travel.
Considerations When Choosing a 20 MOA Rail:
- Quality: Invest in a high-quality rail from a reputable manufacturer to ensure accuracy and durability.
- Compatibility: Ensure the rail is compatible with your rifle and scope mounting system.
- Material: Consider the material of the rail (e.g., aluminum, steel) based on your specific needs and environmental factors.
Conclusion:
A 20 MOA rail is a valuable addition to any long-range shooting setup. By providing an initial angle of elevation, it extends the scope's vertical adjustment range, allowing for accurate engagement at longer distances. While not always necessary, it's a crucial component for serious long-range shooters, ensuring maximal performance and precision. Understanding its purpose and considerations can help shooters optimize their rifles for maximum accuracy and effectiveness.
