Quick Answer
When choosing a hunting scope for a custom rifle, consider the type of hunting you'll be doing, the caliber and bullet type, and the magnification and objective lens size required for your needs. Eye relief and parallax adjustment are also essential features. A scope that's compatible with your rifle's mounting system is crucial.
Scope Type and Objective Lens Size
When building a custom rifle, the type of scope you choose will depend on the hunting style and environment. If you’re hunting in low-light conditions or at longer ranges, a 3-9x or 4-12x scope with a 40mm or 56mm objective lens is usually a good choice. For closer-range hunting or varmint shooting, a 1-4x or 1-6x scope with a 30mm or 40mm objective lens may be more suitable. Some popular scope types for hunting include first focal plane (FFP) and second focal plane (SFP) scopes.
Eye Relief and Parallax Adjustment
Eye relief is critical for a comfortable shooting experience. Look for a scope with a minimum of 3.5 inches of eye relief, but 4-5 inches is ideal. Parallax adjustment is also essential for accurate shooting. A scope with a parallax adjustment mechanism, such as an adjustable objective lens or a side parallax adjustment knob, will allow you to eliminate parallax error and ensure accurate shots.
Mounting System and Compatibility
Make sure the scope you choose is compatible with your rifle’s mounting system. The most common mounting systems are Picatinny, Weaver, and Milspec. If you’re building a custom rifle, consider using a Picatinny rail or an Milspec rail to ensure compatibility with a wide range of scopes. Also, consider the weight and durability of the scope and its mounting system, as they will affect the overall performance and reliability of your rifle.
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