Description
Rifle Scope Product Details
BSA Guns 270-412X40AOWRTB Sweet 270 AO 4X-12X 40mm Rifle Scope
Designed for . 270 caliber rifles, the BSA 4-12x Sweet . 270 AO Riflescope offers users many handy features like a 4-12x zooming range, durable construction, fully coated lenses, adjustable objective parallax correction, and a second focal plane 30/30 reticle. This scope ships ready to be mounted using the included 1″ Dovetail rings and offers 100-, 130- , and 150-grain turrets for different ammunition. Also noteworthy is its Climate Xtreme Protection that ensures a waterproof, fogproof, and impact-resistant performance. To help you adjust the trajectories, it also offers windage and elevation with 1/4 MOA clicks. Features: – 30/30 Reticle, 2nd Focal Plane – 1″ Diameter Maintube – Windage/Elevation with 1/4 MOA Clicks – 100-, 130- , and 150-Grain Turrets – Aluminum Alloy Housing – Green Full Coatings – Fogproof/Waterproof/Impact Resistant – Adjustable Objective Parallax – For . 270 Caliber Rifles – Two Dovetail Rings Included Includes: – BSA Optics 4-12x Sweet . 270 AO Riflescope (30/30 Reticle, Matte Black) – 2 x Dovetail Rings Specifications: – Color/Finish: Matte Black – Magnification: 4-12x – Objective Lens Diameter: 40mm – Maintube Diameter: 1″ – Reticle: 30/30 reticle, 2nd focal plane – Field of View: 40. 0-10. 0′ at 100 yd / 13. 3-3. 3 m at 100 m – Parallax Correction: 7. 5 yd / 6. 9 m to infinity – Eye Relief: 4. 0″ – Exit Pupil Diameter: 10-3. 3 mm – Impact Point Correction: 1/4 MOA – Windage/Elevation Adjustment: Yes – Weatherproofing: Waterproof and fogproof – Dimensions: 12. 6″ – Weight: 22. 7 oz.
Rifle Scope Product Features
40mm Adjustable Objective
Water-Proof, Shock-Proof, & Fog-Proof
Size: 4X-12X
Aluminium 1″ Tube.
Standard BSA Reticle
BSA Optics SWEET .270 AO 4-12×40
Specifically designed for the .270 caliber cartridge
The BSA Sweet .270 AO Rifle Scope is specifically designed for the .270 caliber cartridge. Complete with 3 ballistically calibrated turrets for 100gr, 130gr, and 150 gr cartridges, the Sweet .270 AO also features an adjustable objective, fully coated lenses, 30/30 reticle and 2 pc. weaver rings Matte black finish. Waterproof, shockproof and fogproof.
Magnification low: 4; Magnification high: 12
Objective lens diameter: 40 mm
Adjustment MOA: 1/4
Lens Material: Glass; Lens: Fully Coated
W/E Range: 35; Eye Relief: 3 inches
FOV LOW @ 100′ (ft): 40; FOV HIGH @ 100′ (ft): 10
PARALLAX SETTING (yds): 7.5 to Inf.
Reticle: 30/30
Shockproof, Fogproof, Waterproof
Tube diameter: 1″, one piece; Aluminum Construction
Specification
Magnification low: 4; Magnification high: 12; Objective lens diameter: 40 mm
30/30 Duplex Reticle
1 piece aluminum construction, 1 inch tube
Glass lens material, fully coated
Adjustable Objective
Shockproof, Fogproof, Waterproof
22.30 oz weight; 12.9 in length.
Two Piece weaver style mounts included
270-412X40AOWRTB BSA Optics SWEET .270 AO 4-12×40
Calibrated turrets for 100gr, 130gr, and 150 gr cartridges
BSA Optics SWEET .270 AO 3-9×40 BSA Optics SWEET .270 AO 4-12×40
Magnification 3-9 4-12
Objective Diameter 40 mm 40 mm
Adjustable Objective
Lenses Fully Coated Glass Fully Coated Glass
One Piece Aluminum Construction
Shockproof, Fogproof, Waterproof
2 piece Weaver Style Mounts Included
30/30 Duplex Reticle
Length 12.20 in 12.9 in
Weight 21.80 oz 22.30 oz
About the Gamo Scope Maker
Gamo is a premium maker for rifle scopes, optics, mounting solutions, and other accessories used for guns like rifles and long guns. They style and supply their scopes, mounts, and related products by choosing materials which are resilient and long lasting. This includes the BSA Guns 270-412X40AOWRTB Sweet 270 AO 4X-12X 40mm Rifle Scope by Gamo. For more shooting products, visit their website.
Optic Details
Rifle scopes allow you to specifically align a rifle at various targets by lining up your eye with the target at range. They do this through magnifying the target using a set of lenses within the scope. The scope’s alignment can be adapted for consideration of many ecological factors like wind speed and elevation to make up for bullet drop.
The scope’s function is to help the shooter understand exactly where the bullet will land based on the sight picture you are viewing via 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 about 11 parts which are found internally and externally on the scope body. These scope parts consist of the rifle scope’s body, lenses, adjustment turrets or dials, focus rings, and other components. See all eleven parts of a rifle optical system.
Rifle Optic Types
Rifle scopes can be either “first focal plane” or “second focal plane” type of optics. Finding the optimal type of rifle optic is based on what type of shooting you plan to do.
About First Focal Plane Glass
Focal plane scopes (FFP) feature the reticle in front of the zoom lens. These kinds of scopes are useful for:
- Quick acquisition, long distance kinds of shooting
- Shooting scenarios where calculations are very little
- Experienced shooters who recognize their aim point “hold over” plus “lead” correlations for their firearms
- Shooters who don’t mind the reticle is enlarged and requires more visual sight space than a SFP reticle
Info About Second Focal Plane Glass
Second focal plane scopes (SFP) feature the reticle behind the zoom lens. In the FFP example with the SFP scope, the 5x “zoom” one hundred yard tick measurement would be 1/5th of the non “zoom” tick measurement.
- Long distance types of shooting where shooters have more time to make ballistic estimations
- Shooting where most shots happen within much shorter ranges and spaces
- Shooters who select a clearer optic picture without room taken up by the larger sized FFP reticle
Glass Magnification
The amount of zoom a scope offers is determined by the size, thickness, and curvatures of the lenses inside of the rifle scope. The magnification of the scope is the “power” of the scope.
Fixed Power Lens Glass Info
A single power rifle scope or optic uses a magnification number designator like 4×32. This suggests the zoom power of the scope is 4x power and the objective lens is 32mm. The magnification of this kind of optic can not adjust considering that it is a set power scope.
Info on Adjustable Power Lens Rifle Scopes
Variable power rifle scopes have adjustable power. These types of scopes will note the zoom degree in a format such as 2-10×32. These numbers mean the magnification of the scope can be set in between 2x and 10x power. This additionally involves the powers in-between 2 and 10. The power adjustment is achieved using the power ring part of the scope near the rear of the scope by the eye bell.
Glass Power Level and Ranges
Here are some advised scope powers and the ranges where they can be effectively used. Highly magnified scopes will not be as effective as lower powered optics because too much zoom can be a bad thing. The exact same concept applies to extended distances where the shooter needs sufficient power to see where to properly aim the rifle.
Rifle Optic Lens Finishing
All modern rifle optic and scope lenses are layered. There are various types and qualities of finishes. When looking at luxury rifle optics and scope devices, Lens coating can be an important element of defining the capability of the rifle. The lenses are among the most essential pieces of the scope due to the fact that they are what your eye looks through while sighting a rifle in on the point of impact. The finishing on the lenses shields the lens surface area as well as improves anti glare capabilities from refracted natural light and color presence.
HD Versus ED Lens Coatings
Some optic manufacturers even use “HD” or high-def glass finishings that make the most of various processes, polarizations, elements, and chemicals to extract separate color ranges and viewable definition through the lens. This high-definition finishing is commonly used with more costly, high density lens glass which drops light’s chance to refract through the lens glass. Some scope suppliers use “HD” to describe “ED” signifying extra-low dispersion glass. ED deals with how colors are presented on the chromatic spectrum and the chromatic aberration which is similarly called color distortion or fringing. Chromatic aberration is often visible over items with hard edges and outlines as light hits the item from particular angles.
Single Scope Lens Finishing Versus Multi-Coating
Various scope lenses can also have different coverings applied to them. All lenses typically have at least some type of treatment or covering applied to them before they are used in a rifle scope or optic assembly. Since the lens isn’t simply a raw piece of glass, they require performance enhancing coatings. It is part of the carefully tuned optic. It needs to have a finishing applied to it so that the lens will be efficiently usable in many kinds of environments, degrees of light (full VS shade), and other shooting conditions.
Single coated lenses have a treatment applied to them which is generally a protective and enhancing multi-purpose treatment. This lens treatment can preserve the lens from scratches while lowering glare and other less useful things experienced in the shooting environment while sighting in with the optic. The quality of a single layered lens depends on the scope manufacturer and the amount you spent on it. Both are signs of the lens quality.
Some scope manufacturers similarly make it a point to define if their optic lenses are layered or “multi” coated. Being “much better” depends on the maker’s lens treatment technology and the quality of materials used in building the rifle scope.
Anti-water Lens Coverings
Water on an optic’s lens doesn’t support maintaining a clear sight picture through an optic in any way. Lots of top of the line and premium scope makers will coat their lenses with a hydrophilic or hydrophobic covering. The Steiner Optics Nano-Protection is a good example of this sort of treatment. It deals with the exterior of the Steiner scope lens so the H2O particles can not bind to it or produce surface tension. The result is that the water beads move off of the scope to preserve a clear, water free sight picture.
Options for Installing Scopes on Firearms
Installing approaches for scopes come in a few options. There are the standard scope rings which are individually mounted to the optic and one-piece mounts which cradle the scope. These different kinds of mounts also typically can be found in quick release versions which use throw levers which enable rifle shooters to quickly install and remove the scopes.
Hex Key Scope Ring Mounting Solutions
Standard, clamp design mounting scope rings use hex head screws to mount to the flattop design Picatinny scope installation rails on rifles. These types of scope mounts use two different rings to support the optic, and are often made from 7075 T6 billet aluminum which are created for long distance precision shooting. This type of scope install is wonderful for rifles which need a resilient, sound mount which will not move no matter how much the scope is moved or abused.
Rifle Scope Mounts with Quick-Release Cantilever Rings
These types of quick-release rifle scope mounts can be used to rapidly take off a scope from a rifle and reattach it to a different rifle. A wide range of scopes can also be swapped out if they all use a complementary style mount. The quick detach mount style is CNC crafted from anodized 6061 T6 aluminum and the mounting levers attach nicely to a flat top style Picatinny rail. This lets the scope to be sighted in while on the rifle, removed from the rifle, and remounted while retaining precision. These kinds of mounts come in beneficial for shooting platforms which are carried a lot, to take off the scope glass from the rifle for protection, or for scopes which are adopted between several rifles. An example of this mount style is the 30mm mount from Vortex Optics. It typically costs around $250 USD
Sealing and Gas Purging for Optic Tubes
Wetness inside your rifle optic can ruin a day of shooting and your pricey optic by inducing fogging and making residue inside of the scope’s tube. A lot of optics protect against wetness from getting in the scope tube with a system of sealing O-rings which are waterproof. Generally, these water resistant optics can be immersed under 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be more than enough moisture content prevention for common use rifles, unless you plan on taking your rifle aboard a watercraft and are concerned about the scope still functioning if it falls overboard and you can still rescue the rifle.
Gas Purged Glass Tubes
Another part of preventing the accumulation of wetness inside of the rifle scope tube is filling the tube with a gas like nitrogen. Since this space is already occupied by the gas, the glass is less impacted by climate shifts and pressure variations from the outdoor environment which might 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 seek out.
