Last update on June 6, 2023 // Source: Amazon API
Rifle Scope Product Details
Sightmark Core TX 3-12x44DCR .223/.308 BDC Dual Caliber Riflescope
Sightmark core TX riflescopes use fully multi-coated optics to provide optimal light transmission in a variety of conditions. Etched glass reticles, in Red or green, are illuminated to deliver optimal shot placement and are durable to withstand years of shooting. The core TX riflescopes feature exposed, lockable turrets which help maintain a consistent zero. Turrets are quick and easy to adjust to compensate for bullet drop and windage on the fly. The core TX 3-12x44dcr is housed in a durable 30mm tube, built from Aircraft grade aluminum. This scope features a side focus adjustment, a Duplex BDC reticle and is calibrated for 223 and 308 ammo.
Rifle Scope Product Features
BDC reticle calibrated for 223 and 308 ammo
Exposed, lockable turrets
Red/green illuminated reticle
Second focal plane reticle
30mm tubed scope
Sightmark Core TX Series
Designed to enhance the performance of the modern sporting rifle, the Sightmark Core TX Riflescope Series has been designed for accuracy and reliability. Each scope in this tactical series has been carefully crafted to overcome the challenges shooters encounter in the field.
Sightmark Core TX riflescopes use fully multi-coated optics to provide optimal light transmission in a variety of conditions. Etched glass reticles are illuminated to deliver optimal shot placement and are durable enough to withstand hours of shooting.
The Core TX riflescopes feature exposed, lockable turrets which help maintain a consistent zero. Turrets are quick and easy to adjust to compensate for bullet drop and windage on the fly.
Red/Green illuminated reticle
Single-piece tube construction
Aircraft-grade aluminum with hard-anodized finish
Shockproof, fogproof, and waterproof
Lockable, exposed turrets
Second-focal plane reticle
Fully multi-coated optics, crisp edge-to-edge visibility
Scope rings and battery included
Windage and Elevation Adjustment
The Sightmark Core TX riflescopes are equipped with exposed, lockable windage and elevation turrets. 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 100yards. 1 MOA of movement would require 4 clicks.
The Sightmark Core TX Riflescopes use an etched reticle. The reticle can be used without illumination and will appear black. The 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.
DCR Dual Caliber Reticle
This reticle is calibrated for .223 Rem. (55gr and 62gr) and .308 Win. (150gr and 155gr) and was designed for triple duty application: tactical, competition, and hunting. The design provides a fine .3 MOA central aiming crosshair at higher magnifications and holdovers for 300yd, 400yd, 500yd, 600yd and 700yd. The reticle was designed for a 100 yard zero. The calibers and grains ideal for this reticle shoot relatively flat, so the central aiming point of the reticle is used to shoot targets from 0 to 200 yards. For the most accurate precision at 200 yards, it is recommended to aim 3″ high on the target or 1.5 MOA.
1-4x24DCR 3-12x44DCR 4-16x44MR 8.5-25x50MR 1-4×24 A R-223
Reticle Dual Caliber Dual Caliber Marksman Marksman A R-223
Magnification 1-4x 3-12x 4-16x 8-25x 1-4x
Objective lens 24mm 44mm 44mm 50mm 24mm
Weight 17oz 20oz 24oz 29oz 16.2oz
Battery CR2032 CR2032 CR2032 CR2032 CR2032
About the Sightmark Company
Sightmark is a premium company for rifle scopes, optics, mounts, and other accessories used for guns like rifles and long guns. They innovate and make their scopes and related products by choosing building materials which are resilient and long lasting. This includes the Sightmark Core TX 3-12x44DCR .223/.308 BDC Dual Caliber Riflescope by Sightmark. For additional shooting goods, visit their site.
Info About Rifle Scopes
Rifle scopes enable you to specifically aim a rifle at various targets by lining up your eye with the target at range. They do this through zoom by making use of a series of lenses within the scope. The scope’s positioning can be dialed in to take into account various environmental things like wind and elevation to make up 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 using the optic as you line up the scope’s crosshair or reticle with the intended point of impact. The majority of modern-day rifle optics have around eleven parts which are located internally and outside of the scope body. These optic pieces include the rifle scope’s body, lenses, adjustment turrets or dials, objective focus rings, and other elements. Learn about the eleven parts of glass.
Rifle Optic Types
Rifle scopes can be either “first focal plane” or “second focal plane” type of scopes. Choosing the finest type of rifle scope depends on what type of shooting you plan to do.
About First Focal Plane Scopes
Focal plane scopes (FFP) include the reticle in front of the magnification lens. These kinds of scopes are helpful for:
- Quick acquisition, long distance types of shooting
- Shooting situations where estimations are low
- Experienced shooters who have an idea for their target “hold over” and “lead” relationships for their firearms
- Shooters who don’t mind the reticle is enlarged and takes up more visual sight area than a SFP reticle
Info About Second Focal Plane Scopes
Second focal plane optics (SFP) include the reticle to the rear of the zoom lens. This triggers the reticle to stay at the exact same overall size relative to the amount of magnification being used. The result is that the reticle measurements evolve based upon the zoom chosen to shoot over greater distances since the markings present different increments which can vary with the magnification level. In the FFP illustration with the SFP optic, the 5x “zoom” 100 yard tick measurement would be 1/5th of the non “zoom” tick reticle measurement. These sorts of optics are beneficial for:
- Far away kinds of shooting where shooters have increased time to make ballistic estimations
- Shooting where most of the shots occur within shorter proximities and ranges
- Shooters who would like a clearer optic sight picture with less room taken up by the bigger FFP reticle
Magnification for Scopes
The amount of scope zoom you require is based on the sort of shooting you choose to do. Almost every type of rifle optic delivers some degree of zoom. The volume of magnification a scope offers is established by the diameter, density, and curves of the lens glass inside of the rifle optic. The magnification of the scope is the “power” of the glass. This suggests what the shooter is checking out through the scope is amplified times the power factor of what can normally be seen by human eyes.
Single Power Lens Optic Facts
A single power rifle scope and optic will have a zoom number designator like 4×32. This indicates the magnification power of the scope is 4x power and the objective lens is 32mm. The zoom of this type of optic can not adjust considering that it is a fixed power scope.
Variable Power Lens Optics
Variable power rifle scopes can be changed between magnification increments. These types of scopes will note the zoom amount in a format such as 2-10×32. These numbers mean the magnification of the scope could be adjusted between 2x and 10x power. This also incorporates the power levels in-between 2 and 10. The power shift is achieved by operating the power ring component of the scope near the rear of the scope by the eye bell.
Optic Power Level and Range Correlation
Here are some suggested scope power levels and the distances where they may be successfully used. Consider that high power glass will not be as effective as lower powered scope and optics since too much magnification can be a bad thing. The same relates to longer distances where the shooter needs to have sufficient power to see exactly where to properly aim the rifle at the target.
Details on Lens Finishing
All modern rifle glass lenses are layered. Lens finish can be a crucial aspect of a shooting system when considering high end rifle optics and scope systems.
HD Versus ED Lens Coatings
Some scope manufacturers likewise use “HD” or high-definition lens coatings which use different procedures, aspects, polarizations, and chemicals to draw out a wide range of colors and viewable definition through the lens. Some scope manufacturers use “HD” to refer to “ED” indicating extra-low dispersion glass.
Single Covering Versus Multi-Coating
Various optic lenses can likewise have various finishings applied to them. All lenses typically have at least some type of treatment or finish applied to them before being used in a rifle scope or optic.
This lens treatment can safeguard the lens from scratches while minimizing glare and other less beneficial things experienced in the shooting environment while sighting in with the scope. The quality of a single layered lens depends on the scope manufacturer and how much you paid for it.
Some scope manufacturers also make it a point to specify if their optic lenses are covered or “multi” covered. Being “much better” depends on the manufacturer’s lens treatment innovation and the quality of materials used in developing the rifle scope.
Anti-water Lens Coatings
Water on a lens does not help with preserving a clear sight picture through a scope at all. Lots of top of the line and military grade scope makers will coat their lenses with a hydrophilic or hydrophobic anti-water coating.
Scope Installing Options
Installing solutions for scopes are available in a couple of choices. There are the basic scope rings which are individually mounted to the scope and one-piece scope mounts which cradle the scope. These different kinds of mounts also usually are made in quick release variations which use toss levers which allow rifle operators to rapidly mount and remove the optics.
Hex Key Scope Ring Mounting Solutions
Basic, clamp-on style mounting scope rings use hex head screws to fix to the flattop style Picatinny scope mount rails on the tops of rifles. These forms of scope mounts use a pair of independent rings to support the scope, and are normally constructed from 7075 T6 billet aluminum or similar materials which are manufactured for long distance precision shooting. This type of scope mount is excellent for rifles which require a durable, hard use mount which will not shift regardless of just how much the scope is moved or abuse the rifle takes. These are the type of mounts you really want to have for a dedicated scope system on a far away scouting or tournament long gun that will rarely need to be modified or adjusted. Blue 242 Loctite threadlocker can additionally be used on the mount screws to protect against the hex screws from backing out after they are mounted tightly in position. An example of these rings are the 30mm type from Vortex Optics. The set typically costs around $200 USD
Quick-Release Cantilever Glass Rings
These kinds of quick-release rifle scope mounts can be used to rapidly connect and take off a scope from a rifle. Multiple scopes can also be swapped out if they all use a complementary style mount. The quick detach design is CNC machined from anodized 6061 T6 aluminum and the mounting levers connect securely to a flat top design Picatinny rail. This allows the scope to be sighted in while on the rifle, removed from the rifle, and remounted back on the rifle while retaining accuracy. These kinds of mounts are useful and handy for shooting platforms which are hauled around a lot, to remove the optic from the rifle for protection, or for aiming systems which are chosen for use in between a number of rifles. An example of this mount style is the 30mm mount designed by the Vortex Optics manufacturer. It usually costs around $250 USD
Info Around Glass Tube Sealing and Gas Purging
Moisture inside your rifle optic can destroy a day of shooting and your expensive optic by bringing about fogging and developing residue inside of the scope tube. Most scopes prevent moisture from going into the scope tube with a system of sealing O-rings which are waterproof.
Gas Purged Optic Tubes
Another component of avoiding the buildup of moisture inside of the rifle optic’s tube is filling the tube with a gas like nitrogen. Given that this area is currently taken up by the gas, the optic is less impacted by temperature alterations and pressure distinctions from the outdoor environment which could potentially enable water vapor to leak in around the seals to fill the void which would otherwise be there. These are good qualities of a good rifle scope to look for.