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December 22nd, 2013

Varminters Debate Holding-Off vs. Cranking Elevation

Leuopold Varmint Hunters' ReticleA varmint shooter’s target is not conveniently placed at a fixed, known distance as it is for a benchrester. The varminter must repeatedly make corrections for bullet drop as he moves from closer targets to more distant targets and back again. Click HERE to read an interesting Varmint Forum discussion regarding the best method to adjust for elevation. Some shooters advocate using the scope’s elevation adjustments. Other varminters prefer to hold-over, perhaps with the assistance of vertical markers on their reticles. Still others combine both methods–holding off to a given yardage, then cranking elevation after that.

Majority View–Click Your Scope
“I zero at 100 yards — I mean really zero as in check the ballistics at 200 and 300 and adjust zero accordingly — and then set the scope zero. For each of my groundhog guns I have a click chart taped into the inside of the lid of the ammo box. Then use the knobs. That’s why they’re there. With a good scope they’re a whole lot more accurate than hold-over, with or without hash marks. This all assumes you have a good range finder and use it properly. If not, and you’re holding over you’re really just spraying and praying. Try twisting them knobs and you’ll most likely find that a 500- or 600- or 700-yard groundhog is a whole lot easier than some people think.”
– Gunamonth

“I have my elevation knob calibrated in 100-yard increments out to 550. Range-find the critter, move elevation knob up…dead critter. The problem with hold-over is that it is so imprecise. It’s not repeatable because you are holding over for elevation and for wind also. Every time you change targets 50 yards, it seems as if you are starting over. As soon as I got completely away from the hold over method (I used to zero for 200), my hit ratios went way up.” — K. Candler

“When I first started p-dog shooting, I attempted to use the hold-over method with a 200-yard zero with my 6mm Rem. Any dog much past 325-350 yards was fairly safe. I started using a comeups table for all three of my p-dog rifles (.223 Rems and 6mm Rem). 450-yard hits with the .223s are fairly routine and a 650-yard dog better beware of the 6mm nowadays. An added benefit (one I didn’t think of beforehand) with the comeups table (elevation only), is that when the wind is blowing, it takes half of the variables out of the equation. I can concentrate on wind, and not have to worry about elevation. It makes things much more simple.” — Mike (Linefinder).

“I dial for elevation and hold for wind. Also use a mil-dot reticle to make the windage holds easier. For windage corrections, I watch for the bullet strike measure the distance it was “off” with the mil-dot reticle, then hold that much more the other way. Very fast once you get used to it.” — PepeLP

Varmint Hunting ScopeMinority View–Hold-Over is Better
“I try to not touch my knobs once I’m zeroed at 200 meters. Most of my varmint scopes have duplex reticles and I use the bottom post to put me on at 300 meters versus turning knobs. The reason I try to leave my knobs alone is that I have gone one complete revolution up or down [too far] many times and have missed the varmint. This has happened more than once and that is why I try not to change my knobs if at all possible.” — Chino69

“I have been using the hold over method and it works for me most of the time but the 450 yards and over shots get kinda hard. I moved to a 300 yard zero this year and it’s working well. I do want to get into the click-up method though; it seems to be more fool-proof.” — 500YardHog

Compromise View–Use Both Methods
“I use both [methods] as well — hold over out to 250, and click up past that.” — Jack (Wolf)

“I use the target knobs and crank-in elevation. I also use a rangefinder and know how far away they are before I crank in the clicks. I have a scope with drop dots from Premier Recticle and like it. No cranking [knobs] out to 600.” –Vmthtr

Permalink Optics, Shooting Skills 7 Comments »
December 15th, 2013

New MOA-Based TS-32X1 Reticle from Leupold

Leupold MOA holdoff reticel ts-32x1Leupold has just introduced a new second focal plane reticle with MOA-based hashmarks, allowing precise hold-overs and hold-offs (for wind). The new TS-32X1 reticle, is a minute-of-angle (MOA) based system designed to allow for precision shots without the need for dial adjustments. The TS-32X1 reticle is designed to work with riflescopes that employ 1/4-MOA target adjustments or M1 dials.

The TS-32X1 is the first in a family of MOA-based reticles that will cover several magnification ranges. The TS-32X1 will be available for a wide variety of Leupold riflescopes. For $159.99, the Leupold Custom Shop can also retrofit this reticle into many existing Leupold scopes. Adding the TS-32X1 to a new riflescope ordered through the Custom Shop will cost $129.99.

Leupold MOA holdoff reticel ts-32x1

MOA-Based Hashmarks on Horizontal and Vertical Stadia
On the TS-32X1 reticle, a heavy post and thin stadia crosshair features 1-MOA hashmarks on both the horizontal and vertical lines. Every other hash mark on the horizontal stadia is slightly longer, providing quick and easy 2-MOA measurements. There is a number placed every fourth MOA for quick reference.

The vertical stadia is also set up with 1-MOA tics and longer 2-MOA marks. In addition, every fourth mark is numbered, all the way to the complete 32-MOA elevation range. Wind dots in the lower half of the reticle are spaced in 2=MOA increments, both vertically and horizontally.

This new TS-32X1 reticle is currently available for most second (rear) focal plane VX-3, VX-III, Vari-X III and Mark 4 4.5-14 LR/T riflescopes. Existing riflescopes can be retrofitted for $159.99 through the Leupold Custom Shop. To add the TS-32X1 to a new riflescope ordered through the Custom Shop is $129.99.

Product tip from EdLongrange. We welcome reader submissions.
Permalink New Product, Optics 4 Comments »
November 2nd, 2013

AccuScore SmartPhone Apps Help with Rifle Sight-In Process

Accuscope rifle zero appMany folks struggle when they sight-in a scoped rifle for the first time. A very common mistake is clicking the turrets in the wrong direction. That’s frustrating and it wastes ammo. Another common problem occurs when people sight-in at a distance other than 100 yards. People sometimes struggle to figure out how many clicks they need to correct point of impact if they’re zeroing at 200, 250, or 300 yards.

To make the sight-in process more fool-proof, AccuScope has released two handy Apps for smart phone users. Whether used for initial sight-in or in-the-field adjustments, these smartphone Apps can get you zeroed quickly and reliably.

Accuscope rifle zero app

Using the Apps is easy. First, boresight the gun to get on paper. After the gun is fouled-in (so it is shooting normally) shoot a carefully aimed 3-shot group. Then go to the target and measure the vertical and horizontal distance from the 3-shot group center to your aiming point. Input those numbers into the App, along with your sight-in distance (from muzzle to target). The App then calculates exactly how many elevation and/or windage clicks you must crank into your scope to move point-of-impact to point of aim. Put in the specified clicks and then take a fourth shot to confirm your zero. The fourth shot should impact right on your point of aim (within the limits of the gun’s inherent accuracy.)

Given Murphy’s Law, a shooter can still mess things up if he inputs left clicks when the App calls for right clicks, or inputs down clicks when he needs up clicks. But as long as you look at the “R/L” and “Up/Down” labels on your turrets before spinning the knobs, you shouldn’t have any problems.

AccuScope is available in two versions, Standard and Premium. The $4.99 Standard version works for 1/4 MOA-click-value scopes. The $9.99 Premium version works with all scopes and any click values. The Premium version works with 1/8 MOA clicks, 1/4 MOA clicks, Metric clicks, or Milrad segment click values. So, if you have a scope with 1/8 MOA clicks, you’ll need the Premium version.

AccuScope iPhone Apps are available through Apple’s App Store: Standard | Premium
AccuScope Android Apps are available through the AppBrain Store: Standard and Premium

Editor’s Comment: Does this App really provide a solution you can’t figure out yourself with simple arithmetic? No, but some math-challenged guys may find that the App prevents errors. Additionally, following the step-by-step process used by the App will probably help some shooters avoid confusion, and avoid wasting ammo clicking in the wrong directions.

Note however, that there is an even simpler way to zero, if you have a very solid front and rear rest that will hold the gun absolutely steady while you click. After bore-sighting, fire a couple rounds (with the same point of aim). Then place the rifle so the center of the cross-hairs is exactly on your original point of aim. Next, without disturbing the gun in any way, dial your turrets so that the center of the cross-hair moves over the center of your group. That’s it. You’re now zeroed (though you may want to repeat the process for confirmation). Again, this only works if the gun doesn’t shift one bit when you’re clicking. Having a helper steady the gun as you click the turrets will make this “no-math” method work more effectively.

Click-to-Initial POI Zeroing Method Demonstrated

Product Tip by EdLongrange. We welcome reader submissions.

Permalink New Product, Optics No Comments »
October 7th, 2013

New Bushnell Scope Has BDC Reticle Calibrated for .22 LR Ammo

Bushnell .22 LR BDC rifle scope 3-7x32Here’s a new scope that may be well-suited for short-range varmint hunting (for smaller critters) and for rimfire tactical matches. Bushnell has released a new, affordable 2-7x32mm variable rifle scope with a Bullet Drop Compensating (BDC) reticle configured for the .22 LR rimfire cartridge. Anyone who has shot the .22 LR past 50 yards knows that this round drops a lot in a short distance. The “Drop Zone” BDC reticle, with multiple aiming points out to 125 yards, helps you stay on target. The reticle is calibrated for 38-40 grain, .22 LR high-velocity loads, with a 50-yard zero. This new scope, part of Bushnell’s AR line of scopes, features a 1″ main tube, target-style turrets, and side-focus parallax adjustment. MSRP is $149.99, but web vendors have lower prices. Amazon.com sells the scope for $131.23 with free shipping for Prime Members.

Bushnell .22 LR BDC rifle scope 3-7x32
Permalink New Product 4 Comments »
October 6th, 2013

Zeiss Extends Custom Ballistic Turret Offer Through End of 2013

Carl Zeiss Sports Optics is extending its ZEISS/Kenton Industries Custom Turret Promotion through December 31, 2013. Through this special offer, when you purchase a new CONQUEST HD5 Riflescope, you get one of two Kenton Custom Turrets calibrated for your specific load — either a LR Hunter Turret or Speed Dial Turret. Eligible scope models are the Zeiss CONQUEST HD5 3-15×42 #20 reticle with Lockable Target Turret, and the CONQUEST HD5 5-25×50 #20 reticle with Lockable Target Turret. The retail value for the free custom elevation turret is $125.00

Zeiss Compensation Ballistics Turret Promotion Kenton IndustriesMike Jensen, President of Carl Zeiss Sports Optics USA explains how the system works:

“With our custom turret system, [just] set the dial to the number 4 for 400 yards and you’re done. No complicated math, and no color codes to compensate for the bullet drop. The numbered markings on the custom turret by Kenton Industries are easy to read and intuitive. Add the available ‘no-hold-over’ PLEX reticle with the Kenton custom target turret and you have an extremely accurate and very robust long-range shooting setup.”

To receive a free ZEISS/Kenton Custom Ballistic Turret, the qualifying CONQUEST HD5 Riflescopes must be purchased from an authorized ZEISS dealer before December 31, 2013. Offer details and order forms can be found at Kentonindustries.com or at www.zeiss.com/sports. The order form requires ballistic info such as cartridge, ammunition type, bullet weight, and zero range. The custom turret will be shipped within 2-3 weeks. This offer is valid for U.S. customers only.

For more information on ZEISS products visit www.zeiss.com/sports or the Zeiss Facebook Page.

Permalink Optics No Comments »
October 5th, 2013

Tech Tip: How to Mount a Scope for a Tactical or Hunting Rifle

scope alignment tactical rifle scope levelIn this NSSF video, Ryan Cleckner shows how to set up a scope on a tactical or hunting rifle. Ryan, a former U.S. Army Sniper Instructor, notes that many shooters spend a small fortune on equipment, but fail to set up their rifle to use the optics optimally. Cleckner likens this to someone who owns an expensive sports car, but never adjusts the seat or the mirrors.

Ryan notes that you want your head and neck to be able to rest naturally on the stock, without straining. You head should rest comfortably on the stock. If you have to consciously lift your head off the stock to see through the scope, then your set-up isn’t correct. Likewise, You shouldn’t have to push your head forward or pull it back to see a clear image through the scope. If you need to strain forward or pull back to get correct eye relief, then the scope’s fore/aft position in the rings needs to be altered. Watch the full video for more tips.

Tips on Mounting Your Scope and Adjusting Your Comb Height:
1. Normally, you want your scope mounted as low as possible, while allowing sufficient clearance for the front objective. (NOTE: Benchrest shooters may prefer a high mount for a variety of reasons.)

2. Once the scope height is set, you need to get your head to the correct level. This may require adding an accessory cheekpad, or raising the comb height if your rifle has an adjustable cheekpiece.

3. Start with the rifle in the position you use most often (standing, kneeling, or prone). If you shoot mostly prone, you need to get down on the ground. Close your eyes, and let you head rest naturally on the stock. Then open your eyes, and see if you are too low or too high. You may need to use a cheekpad to get your head higher on the stock.

4. If your scope has a flat on the bottom of the turret housing, this will help you level your scope. Just find a flat piece of metal that slides easily between the bottom of the scope and the rail. Slide that metal piece under the scope and then tilt it up so the flat on the bottom of the scope aligns parallel with the flats on the rail. Watch the video at 8:40 to see how this is done.

scope alignment tactical rifle scope level

Video find by EdLongrange. We welcome reader submissions.
Permalink Hunting/Varminting, Optics 2 Comments »
August 20th, 2013

Burris Signature Rings — Calculating Actual Elevation Changes

Burris Signature Rings with polymer inserts are an excellent product. The inserts allow you to clamp your scope securely without ring marks. Moreover, using the matched offset inserts you can “pre-load” your scope to add additional elevation. This helps keep the scope centered in its elevation range while shooting at long range. Additionally, with a -20 insert set in the front and a +20 insert set in the rear, you may be able to zero at very long ranges without using an angled scope base — and that can save money. (To move your point of impact upwards, you lower the front of the scope relative to the bore axis, while raising the rear of the scope.)

Burris Signature Rings

Insert Elevation Values and Ring Spacing
People are sometimes confused when they employ the Burris inserts. The inset numbers (-10, +10, -20, +20 etc.) refer to hundredths of inch shim values, rather than to MOA. And you need the correct, matched top/bottom pair of inserts to give you the marked thousandth value. Importantly, the actual amount of elevation you get with Burris inserts will depend BOTH on the insert value AND the spacing between ring centers.

Forum member Gunamonth has explained this in our Shooters’ Forum:

Burris inserts are [marked] in thousandths of an inch, not MOA. To know how many MOA you gain you also need to know the ring spacing. For example, with a -20 thou insert set in the front and a +20 thou insert set in the rear, if the ring spacing is 6″, the elevation change will be approximately +24 MOA upwards.

Burris signature rings inserts

Here’s how we calculate that. If you have a 2 X 0.020″ “lift” over a distance of 6 inches (i.e. 0.040″ total offset at 0.5 feet) that’s equivalent to 0.080″ “lift” over 12 inches (one foot). There are 300 feet in 100 yards so we multiply 0.080″ X 300 and get 24″ for the total elevation increase at 100 yard. (Note: One inch at 100 yards isn’t exactly a MOA but it’s fairly close.)

Here’s a formula, with all units in inches:

Total Ring Offset
——————– X 3600 = Change @ 100 yards
Ring Spacing

(.020 + .020)
—————– X 3600 = 24 inches at 100 yards
6

NOTE: Using the above formula, the only time the marked insert offset will equal the actual MOA shift is when the center to center ring spacing is 3.60″. Of course, you are not required to use 3.60″ spacing, but if you have a different spacing your elevation “lift” will be more or less than the values on the inserts.

Permalink Optics, Tech Tip 11 Comments »
July 9th, 2013

Big Discounts on Weaver Scopes at Natchez Shooters Supply

If you need a riflescope at a bargain-basement price, Natchez Shooters Supply (Natchez) is running a big sale on Weaver Scopes right now. You’ll find huge savings on scopes big and small, ranging from a 1.5-4.5x24mm all the way up to an 8-32x50mm. The discounts off MSRP are really pretty remarkable. For example, a Wever 6-24x50mm Classic Extreme Scope with illuminated reticle (and 30mm tube) is now just $339.95, marked down from $579.00. (That’s a 41% price cut). The Weaver 2.5-10x56mm Classic Extreme scope, a good general-purpose 30mm-tube hunting scope, is marked way down to $299.95. Original MSRP on this scope was $926.88, and it sells elsewhere for over $550.00. Most of these scopes are discontinued models, but they still carry the normal Weaver warranty.

Natchez Weaver Optics sale accurateshooter.com

NOTE: to find particular on-sale models, we suggest you type “Weaver” plus the scope power description in the Natchez home page search field. For example, type “Weaver 2.5-10×56″. That should bring up the item with the low sale price.

Scope Sale tip from EdLongrange. We welcome reader submissions.
Permalink Hot Deals, Optics No Comments »
April 13th, 2013

Gauge Low-Light Scope Performance with ScopeCalc.com

Zeiss DiavariHunters and tactical shooters need scopes with good low-light performance. For a scope to perform well at dawn and dusk, it needs good light transmission, plus a reasonably large exit pupil to make maximum use of your eye’s light processing abilty.* And generally speaking, the bigger the front objective, the better the low-light performance, other factors being equal. Given these basic principles, how can we quickly evaluate the low-light performance of different makes and models of scopes?

Here’s the answer: ScopeCalc.com offers a FREE web-based Low-Light Performance Calculator that lets you compare the light gain, perceived brightness, and overall low-light performance of various optics. Using this scope comparison tool is pretty easy — just input the magnification, objective diameter, exit pupil size, and light transmission ratio. If the scope’s manufacturer doesn’t publish an exit pupil size, then divide the objective diameter in millimeters by the magnification level. For example a 20-power scope with a 40mm objective should have a 2mm exit pupil. For most premium scopes, light transmission rates are typically 90% or better (averaged across the visible spectrum). However, not many manufacturers publish this data, so you may have to dig a little.

ScopeCalc.com

ScopeCalc.com’s calculator can be used for a single scope, a pair of scopes, or multiple scopes. Once you’ve typed in the needed data, click “Calculate” and the program will produce comparison charts showing Light Gain, Perceived Brightness, and Low-Light Performance. In the example below, we compared a “generic” 5-18×50 Tactical scope with a “generic” 8-32 Benchrest scope.

ScopeCalc.com

Though the program is easy to use, and quickly generates comparative data, assessing scope brightness, as perceived by the human eye, is not a simple matter. You’ll want to read the annotations that appear below the generated charts. For example, ScopeCalc’s creators explain that: “Perceived brightness is calculated as the cube root of the light gain, which is the basis for modern computer color space brightness scaling.” In addition, the way ScopeCalc measures Low-Light Performance is pretty sophisticated: “Low Light Performance [is calculated] as the average of light gain and resolution gain through magnification, as a measure of target image acuity gain in low light similar to Twilight Performance specified by scope manufacturers. Low Light Performance calculated here is much more useful than Twilight Performance, as Twilight performance is the average of the just the objective lens diameter times magnification, while Low Light Performance is the average of the actual Perceived Brightness times magnification, which also includes the exit pupil/eye pupil relation, light transmission, approximated diffraction, as well as the perception of relative light gain. Just as with Twilight Performance, this Low Light Performance calculation does not yet include lens resolution and contrast as factors. Therefore lower quality optics will yield relatively less gains at higher magnifications.” Got that?

Eye exit pupil*In low light, the human eye can typically dilate to 5mm – 7mm. The exact amount of dilation varies with the individual, and typically declines, with increasing age, from 7mm (at age 20) to a dark-adapted pupil of about 5.5mm by age 65. To take full advantage of a scope’s light-gathering capacity, the diameter of an eyepiece exit pupil should be no larger than the max diameter of your eye’s dark-adapted pupil, so that all of the light collected by the scope enters your eye, rather than falling on the iris. A large 8mm exit pupil may seem good, but it would be partly “wasted” on a shooter in his 60s.

Permalink Hunting/Varminting, Optics, Tech Tip No Comments »
March 24th, 2013

New Prostaff 5 Scopes: 4X Zoom Ratio with Constant Eye Relief

Nikon has introduced an all-new line-up of affordable riflescopes for hunters and varmint shooters. The new Nikon ProStaff 5 Series of scopes feature four times zoom range and a bright new optical system. With their fully multi-coated lenses, ProStaff 5 riflescopes provide up to 95% light transmission. That’s great for hunters working at dawn and dusk. (Some ProStaff 5s also have illuminated reticles). All ProStaff 5 scope models are waterproof, fogproof, and shockproof.
Nikon Prostaff 4 rifle scope

To View ProStaff 5 Scopes, Click this Link and then SORT by “NEWEST” in display.

The ProStaff 5 line-up of scopes ranges from 2.5-10X to 4.5-18X with a variety of reticle options including NikoPlex, BDC, Fine Crosshair with dot, and Mil-Dot. Some ProStaff 5 scopes have an illuminated reticle with five intensity levels of red or green. A rheostat dimmer is located on the side focus knob for easy adjustment. All ProStaff 5 scopes now offer spring-loaded, instant zero-reset turrets. This makes your return-to-zero fast and foolproof in the field. (To set your zero, just sight-in as usual, then lift the spring-loaded adjustment knob, rotate to “zero,” and re-engage.)

Nikon Prostaff 4 rifle scope

ProStaff 5 series scopes were designed with a constant (and generous) four inches of eye relief. If you’ve ever had to move your head back and forth as you changed magnification levels, you know that constant eye relief is a big deal with very real practical benefits in the field. The new ProStaff 5 scopes also feature a quick-focus eyepiece, to allow any shooter to easily bring the reticle into focus.

Nikon Prostaff 4 rifle scope

Nikon ProStaff 5 Scopes

Part # Model Reticle MSRP
6735 2.5-10×40 Nikoplex $269.95
6736 2.5-10×40 BDC $279.95
6737 2.5-10×40 (silver) BDC $289.95
6738 2.5-10×50 Nikoplex $369.95
6739 2.5-10×50 BDC $379.95
6740 3.5-14×40 SF Nikoplex $349.95
6741 3.5-14×40 SF BDC $359.95
6742 3.5-14×40 SF (silver) BDC $369.95
6743 3.5-14×40 SF Mildot $359.95
6744 3.5-14×50 SF Nikoplex $449.95
Part # Model Reticle MSRP
6745 3.5-14×50 SF BDC $459.95
6750 3.5-14×50 SF Illuminated Nikoplex $569.95
6751 3.5-14×50 SF Illuminated BDC $579.95
6746 4.5-18×40 SF Nikoplex $449.95
6747 4.5-18×40 SF BDC $459.95
6748 4.5-18×40 SF Mildot $459.95
6749 4.5-18×40 SF Fine Crosshair with Dot $459.95
6752 4.5-18×40 SF Illuminated BDC $579.95
6753 4.5-18×40 SF Illuminated Nikoplex $569.95
Permalink Hunting/Varminting, New Product, Optics No Comments »