Last update on February 8, 2023 // Source: Amazon API
Rifle Scope Product Details
Sightmark Core SX 10-40×56 Cbr Competition Benchrest Riflescope
When it comes to shooting at extreme distances, so many variables come into play and each one of them critically important. Beginning with target acquisition, the Sightmark core SX 10-40×56 cbr riflescope is a long-range problem solver. Designed specifically for competition shooting and hunting, this high-powered second-focal-plane optic boasts a rugged, single-piece, hard-anodized 30mm 6061-T6 aircraft-grade aluminum tube; nitrogen-filled, IP67 waterproof and dustproof protection; fully multi-coated lenses; finely etched, Red/green illuminated competition bench rest reticle with 10 brightness settings; 1/8 MOA windage and elevation adjustability with exposed, pop-up locking turrets and 40 MOA of travel. While a single CR2032 battery provides up to 100 HRs. Of battery life, the Sightmark lifetime warranty delivers big on peace of mind.
Rifle Scope Product Features
About this item
Exposed, pop-up locking turrets
Second focal plane reticle
Red/green illuminated reticle
Single-piece, 30mm tube
Aircraft grade aluminum
Core HX Riflescope Series
Aircraft grade aluminum
Hard anodized finish
Resettable, capped turrets
Shockproof, fogproof, weatherproof
What’s in the box
– Neoprene scope cover
– Scope rings
Core SX Riflescope
The Core SX Scope Series was designed to meet the needs of hunters shooting crossbows, pistols, shotguns, and rimfire rifles. Product engineers at Sightmark have developed this specialty line of optics based on one leading factor”purpose. We understand that the needs of shooters differ, not only when and where they are hunting, but also the type of weapon they are shooting.
Core SX 10-40×56 CBR Competition Benchrest Riflescope
Designed for long-range hunting as well as recreational and competition shooting, the Core SX 10-40×56 CBR Riflescope is a long-range problem solver. This high-powered second-focal-plane optic boasts a rugged, single-piece, hard-anodized 30mm 6061-T6 aircraft-grade aluminum tube. Includes a neoprene scope cover, 30mm rings and a CR2032 battery.
The Sightmark Core SX riflescope’s eyepiece is designed to rotate to adjust for diopter. The diopter is the measurement of the eye’s curvature. People’s eyes are all curved differently. If the reticle does not appear clear, crisp, nor sharp, rotate the eyepiece until the reticle becomes clear and sharp. This adjustment should stay the same unless the riflescope’s operator changes.
Windage and Elevation Adjustment
The Sightmark Core SX riflescopes come with pre-installed turret caps to protect the windage and elevation adjustments from impacts. The Sightmark Core SX riflescopes have finger adjustable elevation and windage adjustments (3) with audible clicks. Each scope has it’s MOA click value marked on the adjustment. For example, a MOA click means each click moves the point of impact .25″ at 100 yards. 1 MOA of movement would require 4 clicks.
CBR Competition Benchrest Reticle
The Sightmark Core SX 10-40×56 riflescope is equipped with the CBR reticle. The CBR reticle was designed for F-Class and benchrest competition shooting (22LR or long range) At 20x, the reticle has a fine .016 MOA thickness. Making it easy to aim precisely and not cover up the target. At 50 yards the reticle crosshair would cover .032″ of the target or about 1mm. At 1,000 yards the reticle would cover .16″ or 4mm of the target. The elevation has 2 MOA increments out to 20 MOA. Elevation can be used for holdovers for heavy grain large calibers. Windage has 5 MOA increments out to 20 MOA for windage holdovers.
The Sightmark Core SX 10-40×56 CBR is equipped with both red and green illumination. The crossbow scope are equipped with red illumination only. The reticle can be used without illumination and will appear black. The 10-40×56 CBR riflescope dial is marked with “G” for green or “R” for red followed by the brightness setting ranging from 0 (off) to 5. Setting 5 is best for bright, outdoor environments. Setting 1 is best for low light environments.
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Magnification, (x) 2-7 3-9 3-9 4-16 6-24
Objective lens diameter (mm) 32 40 40 44 50
Eye relief (in/mm) 4.7 – 4 / 119.4 -101.6 4 – 3.7 / 101.6 – 94 4 – 3.7 / 101.6 – 94 4.3 – 3.8 / 109.2 – 96.5 4.3 – 3.8 / 109.2 – 96.5
MOA adjustment (one click) 1/4 1/4 1/4 1/4 1/4
Length (in/mm) 11.26 / 286 12.26 / 311.4 12.26 / 311.4 14.3 / 363.22 14.4 / 365.76
Weight (oz) 14 14.2 14.2 16.2 19.4
Reticle HHR HBR VHR VHR VHR
About the Sightmark Company
Sightmark is a premium maker for firearm scopes, optics, mounts, and other add-ons used for guns like rifles and long guns. They design and build their mounts, scopes, and related products choosing elements which are durable and long lasting. This includes the Sightmark Core SX 10-40×56 Cbr Competition Benchrest Riflescope by Sightmark. For additional shooting products, visit their website.
What You Need to Know About Scopes
Rifle scopes enable you to precisely aim a rifle at various targets by aligning your eye with the target at range. They accomplish this through zoom by making use of a set of lenses inside the scope. The scope’s positioning can be adjusted to take into account many natural considerations like wind speed and elevation increases to account for bullet drop.
The scope’s purpose is to help the shooter understand precisely where the bullet will hit based on the sight picture you are viewing through the scope as you line up the scope’s crosshair or reticle with the intended target. A lot of contemporary rifle scopes have around 11 parts which are found inside and on the exterior of the scope body. These scope parts include the rifle scope’s body, lenses, windage and elevation turrets or dials, objective focus rings, and other parts. Learn about the eleven parts of rifle optics.
Rifle Glass Types
Rifle scopes can be either “first focal plane” or “second focal plane” kind of scopes. The type of focal plane an optic has establishes where the reticle or crosshair lies relative to the scopes magnification. It literally means the reticle is situated behind or before the magnifying lens of the optic. Looking for the very best style of rifle glass is based upon what form of shooting you plan on doing.
First Focal Plane Optic Details
Focal plane scopes (FFP) feature the reticle in front of the magnification lens. These styles of scopes are useful for:
- Quick acquisition, far away kinds of shooting
- Shooting situations where calculations are very little
- Experienced shooters who know their target “hold over” and “lead” ratios for their rifles
- Shooters who don’t mind the reticle is enlarged and takes up more visual sight area than a SFP reticle
Info on Second Focal Plane Optics
Second focal plane scopes (SFP) include the reticle to the rear of the magnification lens. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick measurement would be 1/5th of the non “zoom” tick.
- Long distance types of shooting where shooters have additional time to make ballistic calculations
- Shooting where most shots take place within shorter spaces and ranges
- Shooters who desire a clearer optic sight picture with less area used up by the larger size FFP reticle
Magnification for Rifle Glass
The measure of scope zoom you need on your glass depends on the kind of shooting you want to do. Almost every type of rifle optic delivers some amount of zoom. The level of magnification a scope supplies is identified by the diameter, thickness, and curvatures of the lenses inside of the rifle scope. The magnifying level of the optic is the “power” of the opic. This signifies what the shooter is observing through the scope is magnified times the power element of what can generally be seen by human eyes.
Fixed Single Power Lens Rifle Scopes
A single power rifle optic will have a magnification number designator like 4×32. This means the magnification power of the scope is 4x power and the objective lens is 32mm. The magnification of this kind of scope can not fluctuate since it is a set power scope.
Adjustable Power Lens Optic Details
Variable power rifle scopes can be changed between magnification levels. It will list the zoom degree in a configuration like 2-10×32. These numbers mean the magnification of the scope could be changed in between 2x and 10x power. This also involves the power levels in-between 2 and 10. The power manipulation is achieved utilizing the power ring part of the scope near the rear of the scope by the eye bell.
The Power and Range Correlation of Rifle Glass
Here are some advised scope power settings and the distances where they may be efficiently used. Remember that higher magnification scopes and optics will not be as efficient as lower magnification level glass because excessive magnification can be a detractor. The exact same concept applies to longer distances where the shooter needs to have sufficient power to see precisely where to properly aim the rifle at the target.
Glass Lens Coating
All modern rifle scope and optic lenses are coated. There are different types and qualities of glass coatings. When researching luxury rifle optical units, Lens finishing can be an essential aspect of defining the capability of the rifle. The lenses are among the most critical components of the optic since they are what your eye looks through while sighting a rifle in on the point of impact. The finishing on the lenses safeguards the lens surface area as well as assists with anti glare from refracted daylight and color perception.
HD Versus ED Lenses
Some scope makers likewise use “HD” or high-definition lens finishings which use various methods, polarizations, chemicals, and components to draw out separate colors and viewable quality through the lens. Some scope makers use “HD” to refer to “ED” to signify the lens has extra-low dispersion glass.
Single Scope Lens Coating Versus Multi-Coating
Different optic lenses can likewise have different finishes applied to them. All lenses typically have at least some type of treatment or covering applied to them before being used in a rifle scope or optic.
This lens treatment can offer protection to the lens from scratches while lowering glare and other less useful things experienced in the shooting environment while sighting in with the scope. The quality of a single layered lens depends on the scope producer and how much you paid for it.
Some scope makers likewise make it a point to specify if their optic lenses are layered or “multi” coated. This indicates the lens has had numerous treatments applied to the surfaces of the glass. If a lens receives multiple treatments, it can prove that a maker is taking numerous steps to combat different environmental aspects like an anti-glare finish, a scratch resistant anti-abrasion covering, followed by a hydrophilic finishing. This additionally does not always mean the multi-coated lens will perform better than a single coated lens. Being “much better” depends upon the producer’s lens treatment techniques and the quality of components used in constructing the rifle scope.
What to Know About Anti-water Finish
Water on a lens doesn’t assist with preserving a clear sight picture through a scope at all. Lots of top of the line and high-end scope makers will coat their lenses with a hydrophilic or hydrophobic coating which is water repellent.
Alternatives for Installing Optics on Firearms
Mounting options for scopes come in a few choices. There are the basic scope rings which are separately installed to the scope and one-piece scope mounts which cradle the scope. These different types of mounts also normally are made in quick release versions which use toss levers which allow rifle shooters to quickly mount and dismount the optics.
Hex Key Optic Ring Mounting Solutions
Basic, clamp design mounting optic rings use hex head screws to position to the flattop style Picatinny scope mount rails on the tops of rifles. These varieties of scope mounts use a pair of individual rings to support the scope, and are normally constructed from 7075 T6 billet aluminum or similar materials which are manufactured for far away accuracy shooting. This kind of scope mount is effective for rifle systems which need a resilient, unfailing mount which will not move no matter how much the scope is moved about or abuse the rifle takes. These are the type of mounts you really want to have for a devoted scope setup on a long distance hunting or sniper competition rifle that will almost never need to be changed or adjusted. Blue 242 Loctite threadlocker can also be used on the screws to protect against the hex screws from wiggling out after they are mounted safely in place. An example of these rings are the 30mm type from the Vortex Optics company. The set generally costs around $200 USD
Rifle Optic Mounts with Quick-Release Cantilever Rings
These kinds of quick-release rifle scope mounts can be used to rapidly connect and remove a scope from a rifle. If they all use a comparable style mount, multiple scopes can often be switched out in the field. The quick detach mount style is CNC crafted from anodized 6061 T6 aluminum and the mounting levers attach tightly to a flat top type Picatinny rail. This lets the scope to be sighted in while on the rifle, taken off of the rifle, and remounted back on the rifle while retaining precision. These kinds of mounts are useful and handy for shooting platforms which are hauled around a lot, to take off the scope from the rifle for protection, or for scopes which are utilized in between numerous rifles. An example of this mount style is the 30mm mount designed by Vortex Optics. It normally costs around $250 USD
Details on Rifle Glass Tube Sealing and Gas Purging
Moisture inside your rifle scope can destroy a day of shooting and your pricey optic by resulting in fogging and generating residue within the scope’s tube. Most scopes protect against humidity from going into the scope tube with a system of sealing O-rings which are water resistant. Normally, these scopes can be immersed underneath 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be sufficient moisture content prevention for basic use rifles for hunting and sporting purposes, unless you anticipate taking your rifle on a boat and are concerned about the optic still functioning if it is submerged in water and you can still recover the gun.
Gas Purged Rifle Scope Tubes
Another component of avoiding the accumulation of wetness inside of the rifle optic tube is filling the tube with a gas like nitrogen. Given that this area is currently occupied by the gas, the scope is less affected by climate changes and pressure variations from the external environment which could possibly allow water vapor to leak in around the seals to fill the vacuum which would otherwise exist. These are good qualities of a decent rifle scope to look for.