When it comes to precision optics, few names carry the weight of Leupold’s Mark series. The new Mark 4 HD 4.5-18×52 represents a fascinating evolution in this storied line, bringing together decades of military heritage with modern optical engineering. As someone who’s spent countless hours behind various iterations of Leupold scopes, I was particularly intrigued to see how this model would perform in both controlled conditions and real-world applications.

Heritage and Construction

The Mark 4 HD immediately shows its military DNA through its robust 34mm main tube construction. This isn’t just another tactical-looking scope – it’s built like a tank, with the kind of durability that made its predecessors the choice of military and law enforcement professionals worldwide. However, Leupold took the legendary performance of its predecessors and gave it a slimmer maintube that’s packed full of professional-grade features. At only 27.5 ounces, it strikes an impressive balance between durability and weight management that hunters have come to appreciate from Leupold scopes.

Optical Performance

Here’s where things get interesting. The HD optical system delivers exceptional clarity across the entire magnification range, with edge-to-edge sharpness that I’ve come to expect from Leupold. The 52mm objective lens and Twilight Max HD Light Management System combine to create impressive low-light performance. During dawn and dusk testing, I could clearly distinguish target features well after many other premium scopes started to fade. The scope’s generous eye relief of 3.6-3.9 inches provides comfortable viewing while maintaining a full sight picture, even at maximum magnification.

Reticle and Adjustments

The PR2-MIL in the first focal plane (FFP) deserves special mention. It’s clean and uncluttered while providing all the necessary reference points for range estimation and holdovers. The 0.1 MIL adjustments deliver positive, tactile clicks that you can feel even with gloved hands. They aren’t quite at the same level as Mark 5 scopes, but they are more than tactile enough for my needs. The ZeroLock® functionality on both elevation and windage turrets is precise and reliable, which lets you quickly return to zero and prevents inadvertent adjustments in the field. The parallax adjustment, marked from 25 yards to infinity, is smooth and precise.

Tracking and Repeatability

In terms of mechanical precision, the Mark 4 HD demonstrates impressive consistency. Through multiple box tests and return-to-zero exercises, the scope tracked perfectly, maintaining accuracy even through extreme adjustment ranges. The elevation turret provides 36 MILs of total travel (three turns), which is more than enough for even extreme long-range shooting (ELR) scenarios. Each click feels positive and distinct, with no mushiness or overshooting common in lesser optics.

Field Testing with the CVA Cascade LRH in 6.5 PRC

Mounting the Mark 4 HD on CVA’s Cascade LRH in 6.5 PRC created a formidable precision duo. The combination immediately proved its worth during an early morning range session, where the scope’s clarity allowed precise shot placement even in challenging lighting conditions. The reticle’s fine crosshairs proved particularly valuable with this setup, enabling precise holds on small targets while maintaining a clear sight picture of the surrounding target area.

Testing continued with a series of long-range engagements that really showcased both the scope’s and rifle’s capabilities. The 6.5 PRC’s flat trajectory paired beautifully with the Mark 4 HD’s precise adjustments, allowing consistent hits on steel targets from 100 out to 600 yards. The scope’s clarity made spotting impacts easy, while the positive turret adjustments facilitated quick corrections when needed. Throughout the testing, the scope maintained its zero despite the constant turret adjustments and recoil of the 6.5 PRC, demonstrating the robust build quality that Mark 4 optics are known for.

Environmental Performance

The Mark 4 HD’s weatherproofing proved impressive during testing in various conditions. The argon-purged interior showed no signs of internal fogging during rapid temperature changes, and the exterior lens coatings effectively shed water during light rain. The scope’s glare reduction is particularly noteworthy – even when shooting towards the sun, image quality remained remarkably good with minimal washing out.

Value Proposition

While the Mark 4 HD represents a significant investment, its performance justifies the price point for serious shooters. The combination of military-grade durability, exceptional optical clarity, light weight and precise mechanical adjustments places it firmly in the upper echelon of tactical scopes. When compared to other options in its price range, the Mark 4 HD’s real-world performance and Leupold’s legendary customer service make it a compelling choice for long-range competitors and hunters.

Wrap Up

The Leupold Mark 4 HD 4.5-18×52 successfully bridges the gap between military precision and civilian accessibility. It offers the robustness and reliability that made the Mark series famous while incorporating modern optical technologies that enhance its versatility. Whether employed for long-range precision shooting, tactical applications, or hunting, the Mark 4 HD proves itself worthy of the Mark series legacy. Its performance with the CVA Cascade LRH in 6.5 PRC particularly highlighted its capabilities as a precision optic suitable for both long-range precision shooting and hunting applications.

Scope Specifications

Adjustable Parallax	Side Focus
BDC Dial Included	No
Custom Dial System (CDS)	No
Daylight Bright Illumination	No
Elevation Adjustment Type	M5C3
Electronic Reticle Level	No
Guard-Ion Lens Coating	No
Illuminated Reticle	No
Locking Dial	Yes
Motion Sensor Technology (MST)	No
Nightvision Compatible Illumination	No
Revolution Indicator	Yes
Reticle	FFP PR2-MIL
Rezero Type	Set Screw
Reticle Type	First Focal Plane
Adjustable Objective	No
Precision Side Focus	Yes
Windage Adjustment Type	Zero-Lock WIndage
Weight (oz)	27.5
Elevation Adjustment Value per Click	0.1Mil
Elevation Adjustment Range (MOA)	125
Elevation Adjustment Range (MIL)	36
Elevation Adjustment Range (cm @ 100m)	360
Elevation Adjustment Per Revolution	10 MIL
Elevation Dial Travel Limit	28.7MIL
Windage Adjustment Value per Click	0.1Mil
Windage Adjustment Range (MOA)	65
Windage Adjustment Range (MIL)	18
Windage Adjustment Range (cm @ 100m)	180
Windage Adjustment Per Revolution	10 MIL
Magnification Max	18
Magnification Min	4.5
Objective Lens Diameter (mm)	52
Linear FOV Low Mag (ft@100yds)	23.1
Linear FOV High Mag (ft@100yds)	5.2
Angular FOV Low Mag (Degrees)	4.4
Angular FOV High Mag (Degrees)	1
Eye Relief Low Mag (in)	3.6
Eye Relief High Mag (in)	3.9
Minimum Parallax-Free Distance (yd)	25

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