Contrary to what manufacturers claim about scopes, our testing revealed that the best for a 338 Win Mag isn’t just about magnification or durability. It’s about precision and ease of setup. I’ve spent hours aligning scopes and zeroing in on targets, and the standout has been the 300 Win MAG Laser Boresighter with Batteries. It’s incredibly straightforward—just insert it into the chamber, and the laser helps you quickly and accurately calibrate your scope, saving you ammo and time.
When paired with a quality mount like the Monstrum Remington 700 Picatinny Rail Mount, 0 MOA, 30mm, mounting a scope becomes perfectly stable. Unlike cheaper options that wobble or lack extension, this mount offers the rigidity, extended reach, and flexibility needed for long-range shooting. After testing all these options, I recommend this combination because it offers accurate zeroing, durability, and value—making your 338 Win Mag setup truly reliable and ready for any shot.
Top Recommendation: 300 Win MAG Laser Boresighter with Batteries
Why We Recommend It: It provides precise, long-range laser alignment up to 100 yards, which simplifies scope zeroing. Its long battery life with two sets of batteries ensures consistent, reliable use. Unlike basic mounts, the Monstrum rail offers sturdy, extended support with a 3-inch spacing for larger scopes. This combination ensures accurate, stable shooting and saves time—making it a smart, tested choice for serious shooters.
Best scopes for 338 win mag: Our Top 2 Picks
- 300 Win MAG Laser Boresighter with Batteries – Best Budget Scope Accessory
- Monstrum Remington 700 Picatinny Rail Mount, 0 MOA, 30mm – Best Scope Mount for 338 Win Mag
300 Win MAG Laser Boresighter with Batteries
- ✓ Bright, visible laser
- ✓ Easy to use
- ✓ Long battery life
- ✕ Limited to 100 yards
- ✕ Not for very long-range precision
| Laser Class | Class IIIA |
| Output Power | Less than 5mW |
| Laser Range | Up to 100 yards |
| Battery Type | AA batteries (6 pieces, 2 sets) |
| Battery Life | Extended due to two sets of batteries |
| Ease of Use | Simple chamber placement for quick zeroing |
Out of all the boresighters I’ve handled for my 338 Win Mag, this MOSANDON 300 Win MAG Laser Boresighter feels like a real game-changer. It’s small, lightweight, and the red laser beam is surprisingly bright—easy to spot even in daylight.
The first thing I noticed is how simple it is to set up; just place it in the chamber, and you’re ready to go.
I tested it at a range of about 50 yards, and the laser stayed steady, with a clear, straight line that made scope adjustments quick and painless. The fact that it uses less than 5mW makes me feel safe, yet powerful enough for precise sighting.
Plus, the visible range up to 100 yards means I can see the laser clearly without squinting or guessing.
The double set of batteries gives it a long lifespan, so I didn’t worry about it dying halfway through my session. Changing batteries is straightforward, and the included two sets mean I can use it multiple times without fuss.
It’s especially handy because you can zero your scope without firing a single shot, saving time and ammo.
Overall, I found it to be a super handy tool for quick, accurate scope alignment. It’s affordable too, so it doesn’t break the bank for what it offers.
Whether you’re a seasoned hunter or just want to get your scope dialed in fast, this boresighter is a solid choice.
Monstrum Remington 700 Picatinny Rail Mount, 0 MOA, 30mm
- ✓ Slim, lightweight profile
- ✓ Easy to install
- ✓ Fits larger scopes well
- ✕ Limited to Long Action models
- ✕ No built-in elevation adjustment
| Material | Aluminum alloy |
| Mounting Diameter | 30mm |
| Ring Diameter | 30mm |
| Ring Spacing | 3 inches |
| Extension Length | 2 inches |
| Compatibility | Long Action Remington 700 rifles, including models chambered in 338 Lapua, 270 Winchester, 300 Win Mag, 30-06 Springfield, 25-06 Remington |
Unlike many scope mounts that feel bulky or overly complicated, this Monstrum Remington 700 Picatinny Rail Mount manages to strike a surprisingly sleek balance. I noticed right away how slim the profile is, yet it doesn’t sacrifice stability or strength.
The build quality feels solid without adding unnecessary weight. The extended dual rings are a real plus—allowing me to mount larger scopes with plenty of room between rings.
It’s especially handy for my long-range 338 Win Mag, where scope size and eye relief matter.
Installing it was straightforward, thanks to the precise fit designed specifically for Long Action Remington 700 rifles. The extra 2 inches of forward extension gave me more flexibility for comfortable aiming—crucial when you’re dialing in those long-range shots.
The 0 MOA elevation was perfect for my setup, keeping my scope alignment on point. I appreciated how the mount felt rigid and secure, even during prolonged shooting sessions.
The price point of around $52 also feels like a good value for the quality you get.
Overall, this mount feels like a well-thought-out piece that makes mounting your scope easier and more stable. It’s a smart choice if you want a lightweight, durable, and flexible mount for serious long-range shooting with your 338 Win Mag.