The web-based JBM Ballistics Program is one of the most sophisticated and accurate ballistics calculators available — and it’s free. The latest version of the JBM Trajectory Calculator includes field-test-derived actual G7 BCs, as well as bullet drag data from Lapua’s Doppler radar testing. You can also change weather variables, and generate come-up tables for distances out to 3000 yards.
Whenever we have web access, the JBM program is our “go-to” resource for dependable ballistics calculations. In our experience, with most bullets, if you input all the correct variables for the JBM program, it should get you within 1/2 moa (2 clicks), at 600 yards.
New URLs for JBM Ballistics Calculators
With the release of the latest version of the JBM program, some URLs for the calculations pages have changed. You may want to update your bookmarks with the following web addresses:
Let’s say you’ve purchased a new scope, and the spec-sheet indicates it is calibrated for quarter-MOA clicks. One MOA is 1.047″ inches at 100 yards, so you figure that’s how far your point of impact (POI) will move with four clicks. Well, unfortunately, you may be wrong. You can’t necessarily rely on what the manufacturer says. Production tolerances being what they are, you should test your scope to determine how much movement it actually delivers with each click of the turret. It may move a quarter-MOA, or maybe a quarter-inch, or maybe something else entirely. (Likewise scopes advertised as having 1/8-MOA clicks may deliver more or less than 1 actual MOA for 8 clicks.)
Reader Lindy explains how to check your clicks: “First, make sure the rifle is not loaded. Take a 40″ or longer carpenter’s ruler, and put a very visible mark (such as the center of an orange Shoot’N’C dot), at 37.7 inches. (On mine, I placed two dots side by side every 5 inches, so I could quickly count the dots.) Mount the ruler vertically (zero at top) exactly 100 yards away, carefully measured.
Place the rifle in a good hold on sandbags or other rest. With your hundred-yard zero on the rifle, using max magnification, carefully aim your center crosshairs at the top of the ruler (zero end-point). Have an assistant crank on 36 (indicated) MOA (i.e. 144 clicks), being careful not to move the rifle. (You really do need a helper, it’s very difficult to keep the rifle motionless if you crank the knobs yourself.) With each click, the reticle will move a bit down toward the bottom of the ruler. Note where the center crosshairs rest when your helper is done clicking. If the scope is accurately calibrated, it should be right at that 37.7 inch mark. If not, record where 144 clicks puts you on the ruler, to figure out what your actual click value is. (Repeat this several times as necessary, to get a “rock-solid”, repeatable value.) You now know, for that scope, how much each click actually moves the reticle at 100 yards–and, of course, that will scale proportionally at longer distances. This optical method is better than shooting, because you don’t have the uncertainly associated with determining a group center.
Using this method, I discovered that my Leupold 6.5-20X50 M1 has click values that are calibrated in what I called ‘Shooter’s MOA’, rather than true MOA. That is to say, 4 clicks moved POI 1.000″, rather than 1.047″ (true MOA). That’s about a 5% error.
I’ve tested bunches of scopes, and lots have click values which are significantly off what the manufacturer has advertised. You can’t rely on printed specifications–each scope is different. Until you check your particular scope, you can’t be sure how much it really moves with each click.
I’ve found the true click value varies not only by manufacturer, but by model and individual unit. My Leupold 3.5-10 M3LR was dead on. So was my U.S.O. SN-3 with an H25 reticle, but other SN-3s have been off, and so is my Leupold 6.5-20X50M1. So, check ‘em all, is my policy.”
From the Expert: “…Very good and important article, especially from a ballistics point of view. If a ballistics program predicts 30 MOA of drop at 1000 yards for example, and you dial 30 MOA on your scope and hit high or low, it’s easy to begin questioning BCs, MVs, and everything else under the sun. In my experience, more than 50% of the time error in trajectory prediction at long range is actually scope adjustment error. For serious long range shooting, the test described in this article is a MUST!” — Bryan Litz, Applied Ballistics for Long-Range Shooting.
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Hey Burris, Leupold, Sightron and Weaver — are you reading this? If you want to dominate the market for varmint scopes, give us a large elevation knob offering at least 20 MOA in a single revolution. IOR and U.S. Optics already offer this “one-rev” option on tactical scopes and it is clearly superior when moving back and forth between multiple yardages. Schmidt & Bender offers a single-turn option on some S&B PMII Tactical scopes, along with a color-coded, double-turn elevation turret option.
IOR’s big 9-36×56 scope offers 25 MOA of elevation in ONE ROTATION (and about 75 MOA overall). If you use the zero stop, that one rotation (25 MOA) will get most rifles to 850 yards with ease (and very few varmint shots are made beyond that). That means you should never loose track of your elevation setting. Right in front of your nose is a large visible number that corresponds to your actual come-up: “7” for 7 moa, “12” for 12 moa, and so on. Wow–this is so easy compared to other systems that require multiple revolutions and leave you staring at unlabeled hash marks wondering how many clicks you just dialed in or out.
When this Editor first tried a one-rotation elevation knob I had the same reaction I did years ago when I watched a ultra-high-grade flat screen TV for the first time. Then I thought… “wow, this flat screen is just better in every respect and, eventually, will change everything.” Scopes aren’t TV sets, but I think the large one-rotation knob IS a huge advancement — a breakthrough in scope design. When used with a come-up table showing the elevation needed for various yardages (50-1000 yards), the one-rev system makes it really hard to be “way off” in your elevation. With conventional elevation knobs it is very easy to lose track of clicks (and whole revolutions) as you move up and down to different yardages.
The IOR and U.S. Optics products offering 20+ MOA in one-revolution are large, heavy, expensive scopes. The big elevation knob on the IOR Ultra Long Range scope has about 125 MOA total elevation (25 MOA per turn) with 1/4-MOA clicks. The large flat EREK (Erector Repositioning Elevation Knob) on the U.S. Optics scopes offers 22.5 MOA per revolution, with a total of about 62 MOA in a 5-25 SN-3 model with 1/4-MOA clicks.
Scope-Makers Should Adapt Technology to Varmint Scopes
It’s time for the mainstream scope makers to bring this techology to the market. Adding a one-revolution elevation knob (with 25 moa of travel) to a $600.00 varmint scope would make a huge difference in practical functionality in the field. You could reliably click back and forth between yardages all day long and never lose track of your elevation setting. This is almost as easy as a yardage-calibrated elevation knob (but not limited to a single load.) So, you scope makers out there… How about giving us a one-revolution elevation knob on an affordable hunting scope?
Leupold is now offering Custom Dial System (CDS®) elevation turrets in more models of VX-3 and VX-3L riflescopes. These CDS turrets have a dial calibrated for load ballistics supplied by the scope owner, with markings that correspond to range yardages. So, instead of dialing-in a specified number of clicks from a ballistics table, you simply dial to the indicated yardage (see demo at right). For example, to hit a target at 500 yards, you simply spin the dial to the “5” mark on the turret. You can order multiple dials, set up for different loads.
New VX-3 CDS models include the 4.5-14x40mm AO, 4.5-14x40mm Side Focus, and 4.5-14x50mm Side Focus. The new VX-3L CDS model is the 4.5-14x56mm Side Focus.
How the CDS™ System Works The CDS System works by laser-inscribing your scope’s elevation dial to match your load, velocity and conditions. Each CDS dial is custom-calibrated based on key ballistic factors: Caliber, Bullet Weight, Bullet Type, Ballistic Coefficient, Muzzle Velocity, Average Elevation, and Average Temperature.
With CDS turrets mounted on a VX-3/VX-3L scope, you can quickly get on target by dialing the elevation to different ranges with a custom adjustment matched to your rifle- and load-specific ballistics. Leupold CDS riflescopes comes with standard ¼-MOA click adjustment dials. VX-3 CDS models include a coupon redeemable for one FREE custom-engraved CDS dial. Additional dials may be purchased for $59.99 each. All you need to swap between dials is a small screw-driver to work a simple set-screw. One-Revolution stops are available for custom dials.
Pat Mundy, communications manager for Leupold & Stevens, Inc., explained, “When you purchase a CDS riflescope, contact us with your ballistic data and shipping information, then we’ll send you a dial custom built to match the caliber and load you are using. It’s as simple as that. There are no adjustment covers to lose and the CDS makes your VX-3 even more accurate and rugged.”
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Here’s something that can save you lots of time and aggravation on a varminting trip. This little $110 gizmo is great for varmint hunters and any one who needs to make a quick shot in shifty wind conditions. Instead of the traditional 1/4-MOA hash marks, the Kenton windage turret features markers corresponding to the wind drift your ammo will encounter at various distances (with 10 mph full value winds). You just dial the distance.
Custom-Calibrated Windage Knobs
Kenton Industries’ Tuned Windage Compensator (TWC) has built-in windage marks for 10 mph cross-winds at 100-1000 yards. How do they do that? Well the knobs are calibrated either for specific calibers/loads, or they can make custom knobs using your observed field data. The knobs can compensate for various wind speeds (2-20 mph) and angles (15°- 90°), by applying some simple conversion ratios. As a general rule, with a “full-value”, i.e. 90°, crosswind, the wind drift will go up or down in direct proportion to the change in windspeed. That means, for example, a 10 mph crosswind will push the bullet twice as much sideways as a 5 mph crosswind.
Two versions of Kenton’s TWC knobs are offered. The $109.95 TWC #1 features calculated ballistics for standardized factory ammo for the caliber and barrel length you specify. The $109.95 TWC #2 feature customized windage settings based on bullet BC, environmental conditions, elevation, and ballistic information you provide.
Custom Elevation Knobs
Kenton also makes a $109.95 elevation-compensating TTC knob, that can be customized to your rifle. With this elevation turret, yardages are marked in 50-yard increments, and you can literally just “dial in your distance”. However, to work effectively the TTC knob must be tailored to a particular load (velocity and bullet). Moreover, actual bullet drop will differ with changes in altitude, temperature, and shooting angle — so it’s not as simple as it sounds, and you may need multiple knobs if you shoot a variety of loads. Kenton offers it TTC #1 model calibrated for standardized factory ammo. The TTC #2 is calibrated out to the maximum effective range of your cartridge based on bullet type, muzzle velocity, altitude, and temperature. Select the type of yardage format to be used. The #2 is recommended for wildcatters or for those who want to adjust to specific conditions. Lastly, a TTC #3 elevation knob is offered that relies on the purchaser’s actual recorded drop data from the field. The TTC #3 elevation knob will be calibrated based on the click-value or MOA you provide for each 50-yard increment.
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Bryan Litz, Ballistician for Berger Bullets and author of Applied Ballistics for Long Range Shooting, has tested the latest version of the Shooter Ballistics Calculator for Android™ OS Smartphones and portable devices. This is a very sophisticated, full featured App that incorporates the latest bullet databases with Litz G7 BCs as well as a wealth of other information. It provides extremely reliable ballistics solutions at all ranges, and in all atmospheric conditions.
Bryan tells us: “The Shooter App has been improving steadily since it was first released and there are many new capabilities now. One of the cool new features is a wireless Bluetooth link to Kestrel Weather Trackers. This can automatically provide the exact atmospherics at your location.”
Bryan used the Shooter App on a trip to Wyoming: “I shot a Sako TRG42 in .338 Lapua Mag to 2400 yards with Berger’s new 300gr hybrids. The dope from the Shooter App was spot on up to 103 MOA of drop using the G7 BC of .419 for that bullet! At 2400 yards, even at 6,000 ft+ elevation, the bullet is subsonic but remained stable and tracked perfectly with the predicted trajectory from Shooter. I don’t know if the same bullet would be stable at sea level when fired at that range or not but it worked well at 6,500 feet.”
Litz Says Shooter App Offers Very Sophisticated Ballistics Solutions
Bryan thinks the Shooter App is extremely accurate: “I consulted on the solver development for Shooter so I can personally vouch for the accuracy of this program. You can set up profiles for rifles and ammo types including calibration factors for scope adjustments, temperature affects on powder burn rate / muzzle velocity, and of course G1 and G7 referenced BCs (you can define a ‘stepped’ BC for both as well). You can set preferences for units, atmospherics, station pressure or altitude, and more. It can calculate spin drift and Coriolis effect, or those features can be disabled. If your smartphone has GPS, the program can automatically populate the latitude for Coriolis calculations.”
Shooter App is just $9.99 — A Bargain Given Its Capabilities
The full-featured Shooter App sells for $9.99 in the Android Apps Marketplace. Visit the Shooter App Website to preview the program’s functions and see how the entry screens work. The App is easy to install and run. There is a also a ‘Lite’ version of SHOOTER that you can download for free.
Vortex is an up-and-coming optics maker that has made great strides in recent years. Vortex scopes, spotting scopes and binoculars offer excellent value for the dollar. This year, at SHOT Show, Vortex unveiled its new Viper HS series of scopes, with 30mm tubes and 4X magnification ranges. We checked out the new Viper HS 4-16×50 LR (Long Range) model. This features an exposed elevation turret with Vortex’s CRS zero stop. The 4-16 Viper HS offers 75 MOA of elevation travel (24 MOA per revolution).
Order Custom-Calibrated Elevation Turret Caps
One thing we really liked about the new Viper series of scopes is the availability of custom elevation turret caps. For about $100.00, Vortex will craft a elevation turret cap with range markings custom-calibrated for the ballistics of your load in your rifle. As explained in the video below, you can go to the Vortex website, and input your MV, bullet BC, altitude and other load variables. Then, using the custom elevation turret cap, simply dial in your target range, and hold ‘dead on’.
New Viper HS 1-4x24mm with TMCQ Reticle
The growing popularity of multi-gun competition has spurred interest in compact, zoom scopes that can switch from a wide-angle, zero magnification view for close work to four- or five-power magnification for long-range stages. Vortex Optics has developed a new scope that should work well for 3-Gun carbines, as well as dangerous game hunting rifles. The Viper HS 1-4x24mm with the TMCQ (Tactical Milling Close Quarter) reticle features a 30mm main tube and built-in illumination with 10 intensity levels with an off position between each setting.
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Over the past few weeks, we’ve had a chance to test and evaluate a one-piece shooting rest designed by Wally Brownlee of TargetShooting.com. The model 1000LP rest is solid, strong, nicely-machined, and versatile. We found it provides a very stable platform for every kind of rifle — from big magnums all the way down to benchrest air rifles.
The 1000LP rest is distinguished by its use of two (2) leather sandbags, a normal-sized one in the front and a compact mini-bag in the rear. Many other one-piece target rests use low-friction pads or Delrin contacts in the rear. The typical “lead-sled” rests use a solid cradle or V-block in the rear. The small, cube-like, rear mini-bag helps the model 1000LP out-perform typical, one-piece steady-rests. The small rear bag, which is supported by metal plates on three sides, does a great job stabilizing your gun. We also found that the combination of front and rear sandbags seems to provide good vibration damping — something that really helps with precision shooting.
When our designated trigger-puller Joe Friedrich tried the 1000LP with his tuned rimfire benchrest rifle, he immediately noticed that his gun shot amazingly well. Joe owns a variety of high-quality, one-piece rests, and the model 1000LP produced results equal to the best of them. Consider this, in Joe’s ARA unlimited discipline, a perfect score on a 25-bull target is a 2500, with “worst edge” scoring. “Perfect” 2500s are very rare. Only a handful are shot each year in ARA competition. Now get this, Joe managed to shoot multiple 2500s in a row off this rest, and he did that shooting in a variety of conditions (with different lots of ammo) over a 24-hour period. Joe was amazed that this rest, which was not designed for rimfire benchrest competition, could perform so well.
The model 1000LP has many features which contribute to the rest’s fine performance. First, as noted above, the small, 3-way-braced rear bag really seems to work, as long as it fits your stock well. Second, the windage control (which can be switched from left side to right side), is extremely precise and positive — it has zero slop. Third, the 1000LP has a relatively low-mass center bridge connecting the higher-mass front and rear sections. We think this barbell-type design, combined with the integral hand-rest, helps quell vibrations. Finally, the rear height control lets you make fine elevation adjustments without altering the gun’s position on the front bag.
The 1000LP Works Well for Many Purposes
While we were enthusiastic about the 1000LP’s performance with a rimfire benchrest rifle, we want to stress that this rest was not optimized for smallbore shooting. In fact the 1000LP was designed primarily to provide a stable platform for centerfire rifles. It works great for sighting in your hunting rifle, and it is a fine choice for varminters shooting off a field bench. Though not as fast to adjust as a joystick rest, the 1000LP is no slouch. The rear elevation knob is very quick and easy to employ, while the windage adjustment provides precise horizontal tracking with no vertical or diagonal drift. And because the front support is connected rigidly to the rear section, your front and rear bag always stay in perfect alignment, shot after shot. In the video below you can see Wally Brownlee shooting a 22-250 varmint rifle off his 1000LP rest. Note how well the gun tracks, and how little torque and hop there are, even with a narrow sporter-style stock. (Of course, the installed suppressor does reduce some recoil.)
1000LP Breaks Down into Sections for Transport
The TargetShooting.com model 1000LP easily breaks down into two or three sections. This makes it is easier to pack up and transport than most one-piece rests. The 1000LP also allows easy exchange of front bag assemblies so you can quickly switch from a 3″-wide bag to a narrow front bag for thinner, hunter-style fore-ends. A variety of accessories are available for the model 1000LP, including extra quick-release front bag units ($125.00), large-diameter machined discs for the feet (for added stability), and a dual-rail, front fore-end stop ($89.95).
Model 1000LP Starts at $699.95
Are there downsides to the model 1000LP? Well at $699.95 for the base unit, the 1000LP is far more expensive than a typical Lead Sled-type one-piece rest sold for hunters. However, that’s like comparing a Mercedes with a Yugo. The 1000LP is far more sophisticated than a Lead Sled. Plus, as Joe demonstrated, the model 1000LP can do double-duty as a true competition rest. Don’t even think about using a primitive $130.00 Lead Sled in ARA benchrest competition.
We also found that peak performance demands careful sandbag packing and a good fit of the rear bag to your particular stock. Someone who shoots multiple rifles may want to purchase more than one rear mini-bag so that the rear bag-to-stock fit is optimal. Joe found that bag-to-stock matching was important if you want to shoot ultra-small groups off this rest.
If you are interested in the model 1000LP one-piece rest, visit www.TargetShooting.com or call Wally Brownlee at (800) 611-2164, or +1 605-868-2164 (int’l).
Disclosure: TargetShooting.com provided a “loaner” 1000LP (with accessories) for testing, but Joe Friedrich then purchased the rest at a slight discount off retail.
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Nightforce Optics has enhanced their elevation adjustments in this year’s lineup of high-magnification Nightforce scopes. Now you can get DOUBLE the elevation travel with a SINGLE TURN of the elevation knob. For an NXS with 1/4-MOA clicks, this means you can get a full 20 MOA of elevation travel with a single turn of the knob.
Bravo, Nightforce — this simple enhancement can make a BIG difference in the field. With most “high-performance” calibers, 20 MOA will get you to 700 yards or beyond. This means that the varminter can zero at all likely hunting yardages within the same revolution of the turret. That makes life much simpler, and reduces the chance of being way off in your elevation. No more confusion about which revolution you’re on….
Likewise, a tactical shooter, moving from near to far targets and back again, can likely stay on the same revolution at most target yardages. Even if you shoot out to 1000 yards, you will be able to get all the way out to 1K within two complete revolutions. This upgrade — doubling the elevation travel in each turret revolution — gives Nightforce scopes practical performance (inside 700 yards) similar to much more expensive scopes fitted with a single-turn or double-turn elevation systems (such as the U.S. Optics EREK knob). The new high-speed adjustment system will be offered in Nightforce’s 15x, 22x, 32x, and 42x series of scopes. Anticipated delivery date for scopes with the high-speed adjustment is May, 2010.
What About Retro-fitting Older NF Scopes?
Nightforce plans to provide an upgrade path for existing Nightforce scopes “eventually, but not right away”. The upgrade would allow installation of the “high-speed adjustment” system on older NF scopes. We don’t have any more specifics. Nightforce has NOT revealed how much the high-speed conversion would cost or when it might be available for pre-2010 scopes.
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Here’s something that can save you lots of time and aggravation on a varminting trip. This little $90 gizmo is great for varmint hunters and any one who needs to make a quick shot in shifty wind conditions. Instead of the traditional 1/4-MOA hash marks, the Kenton windage turret features markers corresponding to the wind drift your rifle will encounter at various distances.
Custom-Calibrated Windage Knobs
Kenton Industries’ Tuned Windage Compensator (TWC) has built-in windage marks for 10 mph cross-winds at 100-1000 yards. How do they do that? Well the knobs are calibrated either for specific calibers/loads, or they can make custom knobs using your observed field data. The knobs can compensate for various wind speeds (2-20 mph) and angles (15°- 90°), by applying some simple conversion ratios. As a general rule, with a “full-value”, i.e. 90°, crosswind, the wind drift will go up or down in direct proportion to the change in windspeed. That means, for example, a 10 mph crosswind will push the bullet twice as much sideways as a 5 mph crosswind.
Two versions of Kenton’s TWC knobs are offered. The $89.95 TWC #1 features calculated ballistics for standardized factory ammo for the caliber and barrel length you specify. The $89.95 TWC #2 feature customized windage settings based on bullet BC, environmental conditions, elevation, and ballistic information you provide.
Custom Elevation Knobs
Kenton also makes an $79.95 elevation-compensating TTC knob, that can be customized to your rifle. With this elevation turret, yardages are marked in 50-yard increments, and you can literally just “dial in your distance”. However, to work effectively the TTC knob must be tailored to a particular load (velocity and bullet). Moreover, actual bullet drop will differ with changes in altitude, temperature, and shooting angle — so it’s not as simple as it sounds, and you may need multiple knobs if you shoot a variety of loads. Kenton offers it TTC #1 model calibrated for standardized factory ammo. The TTC #2 is calibrated out to the maximum effective range of your cartridge based on bullet type, muzzle velocity, altitude, and temperature. Select the type of yardage format to be used. The #2 is recommended for wildcatters or for those who want to adjust to specific conditions. Lastly, a TTC #3 elevation knob is offered that relies on the purchaser’s actual recorded drop data from the field. The TTC #3 elevation knob will be calibrated based on the click-value or MOA you provide for each 50-yard increment.
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Three-gun match competitor Zak Smith employs a simple, handy means to store his elevation and wind dift data — a laminated data card. To make one, first generate a come-up table, using one of the free online ballistics programs such as JBM Ballistics. You can also put the information in an Excel spreadsheet or MS Word table and print it out. You want to keep it pretty small.
Below is a sample of a data card. For each distance, the card includes drop in inches, drop in MOA, drop in mils. It also shows drift for a 10-mph cross wind, expressed three ways–inches, MOA, and mils. Zak explained that “to save space… I printed data every 50 yards. For an actual data-card, I recommend printing data every 20 or 25 yards.” But Zak also advised that you’ll want to customize the card format to keep things simple: “The sample card has multiple sets of data to be more universal. But if you make your own data card, you can reduce the chance of a mistake by keeping it simple. Because I use scopes with MILS, my own card (bottom photo) just has three items: range, wind, drop in MILS only.”
Once you have the card you can fold it in half and then have it laminated at a local office store or Kinko’s. You can keep this in your pocket, tape it to your stock, or tie the laminated card to your rifle. If you regularly shoot at both low and high elevations, you may want to create multiple cards (since your ballistics change with altitude). To learn more about ballistic tables and data cards, check out the excellent “Practical Long-Range Rifle Shooting–Part 1″ article on Zak’s website. This article offers many other insights as well–including valuable tips on caliber and rifle selection.
Another option is to place your ballistics card on the back of the front flip-up scope cover. This set-up is used by Forum member Greg C. (aka “Rem40X”). With your ‘come-up’ table on the flip-up cover you can check your windage and elevation easily without having to move up off the rifle and roll the gun over to look at the side of the stock. Greg tells us: “Placing my trajectory table on the front scope cover has worked well for me for a couple of years and thought I’d share. It’s in plain view and not under my armpit. And the table is far enough away that my aging eyes can read it easily. To apply, just use clear tape on the front objective cover.”
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The web-based JBM Ballistics Program is one of the most sophisticated and accurate ballistics calculators available — and it’s free. The latest version of the JBM Trajectory Calculator includes field-test-derived actual G7 BCs, as well as bullet drag data from Lapua’s Doppler radar testing. You can also change weather variables, and generate come-up tables for distances out to 3000 yards.
Reader Lindy explains how to check your clicks: “First, make sure the rifle is not loaded. Take a 40″ or longer carpenter’s ruler, and put a very visible mark (such as the center of an orange Shoot’N’C dot), at 37.7 inches. (On mine, I placed two dots side by side every 5 inches, so I could quickly count the dots.) Mount the ruler vertically (zero at top) exactly 100 yards away, carefully measured.
The IOR and U.S. Optics products offering 20+ MOA in one-revolution are large, heavy, expensive scopes. The big elevation knob on the IOR Ultra Long Range scope has about 125 MOA total elevation (25 MOA per turn) with 1/4-MOA clicks. The large flat EREK (Erector Repositioning Elevation Knob) on the U.S. Optics scopes offers 22.5 MOA per revolution, with a total of about 62 MOA in a 5-25 SN-3 model with 1/4-MOA clicks.
With CDS turrets mounted on a VX-3/VX-3L scope, you can quickly get on target by dialing the elevation to different ranges with a custom adjustment matched to your rifle- and load-specific ballistics. Leupold CDS riflescopes comes with standard ¼-MOA click adjustment dials. VX-3 CDS models include a coupon redeemable for one FREE custom-engraved CDS dial. Additional dials may be purchased for $59.99 each. All you need to swap between dials is a small screw-driver to work a simple set-screw. One-Revolution stops are available for custom dials.
Here’s something that can save you lots of time and aggravation on a varminting trip. This little $110 gizmo is great for varmint hunters and any one who needs to make a quick shot in shifty wind conditions. Instead of the traditional 1/4-MOA hash marks, the Kenton windage turret features markers corresponding to the wind drift your ammo will encounter at various distances (with 10 mph full value winds). You just dial the distance.
Bryan tells us: “The 
Order Custom-Calibrated Elevation Turret Caps
The model 1000LP has many features which contribute to the rest’s fine performance. First, as noted above, the small, 3-way-braced rear bag really seems to work, as long as it fits your stock well. Second, the windage control (which can be switched from left side to right side), is extremely precise and positive — it has zero slop. Third, the 1000LP has a relatively low-mass center bridge connecting the higher-mass front and rear sections. We think this barbell-type design, combined with the integral hand-rest, helps quell vibrations. Finally, the rear height control lets you make fine elevation adjustments without altering the gun’s position on the front bag.
We also found that peak performance demands careful sandbag packing and a good fit of the rear bag to your particular stock. Someone who shoots multiple rifles may want to purchase more than one rear mini-bag so that the rear bag-to-stock fit is optimal. Joe found that bag-to-stock matching was important if you want to shoot ultra-small groups off this rest.
