Understanding .308 Optics Fundamentals
Magnification Matters
The magnification of a scope determines how much closer it brings the target into view. This is typically represented by a number, followed by “x” (e.g., 3x, 9x, 4-16x).
Lower Magnification (e.g., 1-4x, 2-7x, 3-9x): Ideal for close to medium-range shooting, such as hunting in dense cover or tactical applications where rapid target acquisition is paramount. They offer a wider field of view, making it easier to track moving targets.
Medium Magnification (e.g., 3-9x, 4-12x): A versatile choice suitable for both hunting and target shooting at moderate distances. They provide sufficient magnification for accurate shot placement while retaining a reasonable field of view.
Higher Magnification (e.g., 4-16x, 5-25x, 6-24x): Designed for long-range shooting, these scopes allow you to clearly identify and engage targets at extended distances. However, they typically have a narrower field of view, making them less suitable for close-range engagements.
The best .308 scope for you will depend heavily on your shooting style and the distances you typically engage targets at. Consider a variable magnification scope for maximum versatility, allowing you to adjust the magnification to match the situation.
Objective Lens and Light Gathering
The objective lens is the lens at the front of the scope. Its diameter is measured in millimeters (e.g., 40mm, 50mm, 56mm). The objective lens plays a vital role in gathering light. A larger objective lens allows more light to enter the scope, resulting in a brighter and clearer image, particularly in low-light conditions. However, larger objective lenses also add weight and bulk to the scope, which may affect handling and mounting. It’s a balance; you want a lens large enough to gather sufficient light for your intended use but not so large that it becomes cumbersome.
Reticle Selection: The Crosshair’s Significance
The reticle is the aiming point within the scope, and its design can significantly impact your shooting accuracy. The best .308 scope for your needs will have a reticle suited to your style.
Duplex Reticle: Simple, with thicker outer posts that taper to a fine center crosshair. Excellent for hunting, offering quick target acquisition.
BDC (Bullet Drop Compensating) Reticle: Feature holdover points designed to compensate for bullet drop at specific distances. Very helpful for .308 long-range shooting and quickly adjusting for different distances.
Mil-Dot Reticle: Features small dots or hash marks (mils) that can be used for range estimation, windage adjustments, and holdovers. Popular among tactical shooters.
MOA (Minute of Angle)-Based Reticle: Similar to Mil-Dot but uses MOA units for range estimation and adjustments. Offers high precision for target shooters.
Choosing the right reticle depends on your experience level and shooting goals. For hunting, a duplex or BDC reticle may suffice. For long-range precision shooting, a Mil-Dot or MOA-based reticle is usually preferred.
Turrets and Adjustments: Fine-Tuning Your Aim
Adjustment turrets allow you to fine-tune your aim to compensate for bullet drop, wind drift, and other factors.
MOA (Minute of Angle) Adjustments: One MOA equals approximately one inch at 100 yards.
Milradian (Mil) Adjustments: One mil equals approximately 3.6 inches at 100 yards.
Most scopes have either target turrets or capped turrets. Target turrets are designed for frequent adjustments, offering precise clicks for elevation and windage. Capped turrets are less exposed and help to prevent accidental adjustments, typically used for hunting scopes.
Focal Plane Considerations: FFP vs. SFP
The focal plane refers to where the reticle is located within the scope.
First Focal Plane (FFP): The reticle size changes with magnification. This means the holdover points on a Mil-Dot or MOA-based reticle remain accurate at all magnification levels. Excellent for long-range shooting where holdovers are crucial.
Second Focal Plane (SFP): The reticle size remains constant as you adjust magnification. Holdover points are only accurate at one specific magnification setting. Usually easier to see the reticle clearly.
The choice between FFP and SFP often depends on the type of shooting. FFP is generally preferred for long-range precision shooting and tactical applications. SFP is often preferred for hunting or applications where simplicity is key.
Eye Relief and Eye Box: Comfort and Precision
Eye relief is the distance between your eye and the scope’s eyepiece where you can see a full, clear image. The eye box refers to the range of movement you have while maintaining that clear image. Adequate eye relief is essential to prevent eye strain and potential injury from recoil, particularly with a .308 rifle. A good eye box makes it easier to quickly acquire the target and maintain a clear sight picture, especially in dynamic shooting scenarios.
Essential Features to Consider
Intended Application is Paramount
Hunting: Look for scopes with low to medium magnification (e.g., 2-10x, 3-9x) and a bright image. A robust and reliable scope is critical for the demands of the field. Consider features like a fast-focus eyepiece and a capped turret.
Target Shooting: Prioritize high magnification (e.g., 5-25x, 6-24x), precise adjustments, and a clear, crisp image. Target turrets and fine reticles are beneficial.
Tactical/Self-Defense: Consider scopes with a good balance of magnification (e.g., 1-6x, 1-8x), rugged construction, and a fast-adjusting reticle. Illumination may be helpful.
Budget Realities
The best .308 scope doesn’t necessarily mean the most expensive. Set a realistic budget and focus on the features that are most important for your shooting needs. Quality scopes can be found at various price points. A reputable brand will offer better quality.
Durability and Reliability: Investing in Resilience
Your scope will likely endure harsh conditions. Ensure it’s waterproof, fog proof, and shockproof. Look for scopes built with high-quality materials and a rugged design.
Brand Reputation and Warranty
Reputable brands often produce the best .308 scopes. Research brands known for quality, durability, and customer service. A solid warranty provides peace of mind.
Weight and Size: Balance and Maneuverability
Consider the weight and size of the scope, especially if you will be carrying your rifle in the field. A heavier scope can affect handling and balance.
Top Optic Recommendations – .308 Rifle Optics
Best Overall Scope
Vortex Viper PST Gen II 5-25×50: This scope offers a remarkable combination of features, build quality, and value. The Vortex Viper PST Gen II is built to last. It’s known for its incredible clarity and low light performance, with a generous eye box. It’s incredibly versatile, making it great for everything from long-range hunting to precision target shooting. It generally comes with either a MOA or MRAD based reticle.
Detailed Specs and Features: Second Focal Plane, 5-25x magnification range, 50mm objective lens, illuminated reticle, exposed tactical turrets.
Pros: Excellent clarity, robust construction, versatile magnification, great value for the features.
Cons: Heavier than some options, can be more expensive.
Why it’s recommended for .308: A perfect all-rounder, offering the performance needed for long-range .308 shooting.
Best Budget Option
Nikon ProStaff P5 3-9×40: Provides excellent value for money. This is the best .308 scope for those who are on a budget. Its ideal for hunting and provides great clarity.
Detailed Specs and Features: Second Focal Plane, 3-9x magnification range, 40mm objective lens, available with a BDC reticle.
Pros: Affordable, good optical quality, reliable.
Cons: Limited magnification range for long distances.
Why it’s recommended for .308: Provides a reliable and clear optic at a reasonable price for various .308 applications.
Best for Long-Range Shooting
Nightforce ATACR 5-25×56: For serious long-range enthusiasts, the Nightforce ATACR is a top-tier choice. Featuring exceptional optical clarity, a highly precise reticle, and robust construction.
Detailed Specs and Features: First Focal Plane, 5-25x magnification range, 56mm objective lens, illuminated reticle, exposed turrets.
Pros: Exceptional optical clarity, very robust, ultra-precise adjustments.
Cons: Premium price.
Why it’s recommended for .308: Delivers the features needed for long-range precision shooting with a .308.
Best for Hunting
Leupold VX-Freedom 3-9×40: Leupold is known for its quality hunting optics. The VX-Freedom is a great fit for hunting. It has great light transmission and an excellent field of view. The scope is lightweight and rugged.
Detailed Specs and Features: Second Focal Plane, 3-9x magnification, 40mm objective lens, duplex reticle, good eye relief.
Pros: Lightweight, clear optics, simple and effective.
Cons: Less magnification than some, not built for long distance shooting.
Why it’s recommended for .308: A top choice for hunters who want a high-quality scope.
Best for Tactical/AR Platform
Trijicon ACOG 4×32: A legendary choice for tactical applications, this is a robust and reliable optic. It has good clarity.
Detailed Specs and Features: Fixed 4x magnification, illuminated reticle powered by fiber optics and tritium.
Pros: Extremely durable, rapid target acquisition, battle-proven.
Cons: Fixed magnification.
Why it’s recommended for .308: The best for ruggedness.
Mounting and Zeroing Your Scope: The Foundation of Accuracy
Choosing the best optic for .308 is only the first step. Correct mounting and zeroing are critical for achieving accuracy.
Improper mounting can damage the scope and negatively affect shot placement. Choose quality rings or a one-piece mount that’s properly sized for your scope and rifle.
Follow these steps to mount your scope:
Attach the rings or mount to the rifle’s base.
Place the scope in the rings.
Level the scope with the rifle.
Tighten the rings securely, following the manufacturer’s instructions.
Zeroing is the process of adjusting the scope’s turrets to align the reticle with the point of impact of your bullets. Use a secure shooting rest.
Start at a reasonable distance (e.g., 100 yards).
Fire a three-shot group.
Adjust the turrets to move the reticle to the center of the group.
Repeat until your shots consistently hit where you aim.
Maintenance and Care
Proper maintenance will extend the life of your scope and ensure optimal performance.
Clean the lenses regularly with a lens cleaning kit.
Store your scope in a cool, dry place.
Protect the scope from impacts.
