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August 4th, 2019

Sunday GunDay — .22 LR Rimfire Silhouette Match Rifle

Erich Mietenkorte .260 Bobcat silhouette rifle Lilja

The Modern Smallbore Silhouette Rifle
Smallbore rifle silhouette is a shooting discipline that can really test a shooter’s ability and fundamentals. The saying in silhouette is “the bench proves the rifle, standing proves the shooter”. To be able to stand and shoot a rifle at targets ranging from 40 meters to 100 meters is no small feat, especially when the 100 meter ram target is just a little bigger than a large potato.

Of course, you need a good rifle. The CZ 455 has been at the top of the starter rifle list for a long time, however, a few newcomers such as the Tikka T1x are definitely challenging that spot. The gold standard in the silhouette discipline seems to be the venerable Anschutz 1712. With a fantastic two-stage trigger, smooth operation, great balance, and consistent accuracy it’s one of the most popular rifles, just look through the equipment survey from the U.S. Nationals and you will see what I mean. Even though the Anschutz is a great rifle, there are those competitors who want more. Enter Erich Mietenkorte, a Master silhouette shooter from Ellensburg, Washington and his P-51 Mustang-inspired .22 LR silhouette rifle.

Erich Mietenkorte .260 Bobcat silhouette rifle Lilja
The P-51 Mustang artwork was masterfully painted by Perry Mallet of Spokane, WA from a basic theme sketched out by Erich. This is one of the coolest gunstock paint jobs we’ve ever seen. Bravo Mr. Mallet!

Erich’s Smallbore ‘Silhouette Slammer’

Report by Erich Mietenkorte
At the heart of my .22 LR “Silhouette Slammer” is a Sako P94s Finnfire action. I chose this action due to its incredibly fast lock time. Mated to that is a tight-bore Lilja 4-groove barrel finished at 24 inches. This has a Winchester 52D chamber. The barrel and chamber combination were suggested by Loren Peter of Vancouver, WA, a long time silhouette shooter and gunsmith, and it definitely works! The rifle easily and consistently shoots under one inch at 100 meters with good ammo.

Finnfire Fitted with Modified Anschutz 2-Stage Trigger
The Finnfire was originally equipped with a single-stage trigger but I decided that a two-stage works better for me. There weren’t any available options at the time so I took an Anschutz 5109 trigger from a model 1712 and machined a new sear and mated it up to the action.

CLICK to Zoom Photo
Erich Mietenkorte .260 Bobcat silhouette rifle Lilja
Click Image for large, full-size photo showing details of paint-work.

The rifle wears a Leupold FX-3 25-power optic, a scope favored by many silhouette shooters for its clarity, magnification, and relatively light weight. To make weight in Hunter Class, the rifle may weigh no more than 8.5 pounds total with optic! The last component that makes up this winning rifle is the amazing work of art that is the stock. All of these components rest in a custom fiberglass stock made specifically to push the limits of the NRA stock jig that all competition silhouette rifles must fit. The stock was constructed by Steve Wooster, a long-time silhouette shooter from Chehalis, WA. The P-51 Mustang artwork was masterfully painted by Perry Mallet of Spokane, WA from a sketch I did. Perry took an idea and used his artistic abilities to create a masterpiece that looks as good as it shoots.

Erich Mietenkorte .260 Bobcat silhouette rifle Lilja

Getting Started in the Silhouette Game
Erich’s advice for anyone wanting to get started in the fun and challenging discipline of silhouette is to take any .22 LR scoped rifle you have and simply show up at a silhouette match. On many occasions Erich has helped newcomers and has even loaned out his own rifle for novices to try. “One of the best things about silhouette is the generosity and friendliness of the competitors. Silhouette is a shooting sport that you don’t have to be intimidated, all shooting abilities are welcome and everyone has an opportunity to be successful.” To learn more about silhouette shooting, or locate a silhouette match near you, visit Steelchickens.com, a popular silhouette-centric web forum.

In this Video Erich Mietenkorte Shoots Rams at 100M with his .22 LR Silhouette Rifle:

Erich Mietenkorte .260 Bobcat silhouette rifle Lilja
Note the bullet impact locations on those 10 turkeys — that would be about a 1″ group. Great shooter with a great rifle. In Canada two weeks ago, Erich set a new Ram “long run” record, hitting 30 in a row.

The Three Amigos — Along with his P-51 paint job smallbore rifle, here are two of Erich’s centerfire silhouette rigs. Erich notes: “The green rifle is my High Power silhouette standard rifle (class weight limit 10 lbs. 2.0 oz.). This features a Defiance Machine Rebel action with a Lilja #6 Contour barrel finished at 26″. This rig is chambered in .260 Bobcat (aka 6.5×250, i.e. 250 Savage necked up to 6.5mm). This cartridge has the same energy as a .260 Remington but much less felt recoil. It is very efficient and makes a big difference when shooting a lot of rounds in a match.” Stock by Steve Wooster.

Erich Mietenkorte .260 Bobcat silhouette rifle Lilja

The brown rifle (upper right) is a blueprinted Remington 700 action with a Lilja #5 Contour barrel finished at 26″, also chambered in .260 Bobcat. Erich tells us: “I won Second Place at the U.S. National Championships last year with this rifle. Stock made by Wooster. This rifle is for the hunting rifle category (9-lb weight limit). For Hunter rifles in smallbore and High Power the trigger must have a safety and a pull weight at least two pounds. (By contrast, a Standard rifle may have any weight trigger with/without a safety.) Because you can shoot a Hunter rifle in the Standard rifle class, I started my High Power silhouette journey with this rifle and then added the Standard rifle later. I’ll be replacing this rifle this upcoming season with a Defiance Rebel action and barrel chambered in 6mm BR.”

Erich Mietenkorte .260 Bobcat silhouette rifle Lilja

Permalink - Articles, - Videos, Competition, Gear Review 4 Comments »
August 4th, 2019

The “REMAGE” Option — Pre-Fit Barrels for Rem 700 and Clones

Mcree Precision Mcrees Savage Remington pre-fitted pre-chambered pre-fit barrel system kit nut
McRee’s Precision Remington DIY Barrel Kit includes Criterion Pre-Fit Stainless Barrel, Barrel Nut, Recoil Lug, Thread Protector, and Barrel Nut Wrench:

Need a new barrel for your Rem-actioned hunting or tactical rifle? Here’s a great DIY option for riflemen. McRee’s Precision offers complete, no-gunsmithing re-barreling kits for Remington and Rem-clone actions. These feature a high-quality, pre-chambered “PRE-FIT” stainless barrel from Criterion, a Savage-style barrel nut, a recoil lug, and a special barrel-nut wrench. Most of the Pre-Fit barrels are 24″ long and threaded at the muzzle. CLICK Here for all Pre-Fit barrel specs.

With this system you can easily re-barrel your favorite Remington rifle yourself in less than an hour. You don’t need to pay gunsmithing fees, or wait weeks (or months) for a busy smith to do the job. And the price is under $500.00. Kits are currently available for these chamberings: 6.5 Creedmoor, 6mm Creedmoor, .243 Win, .308 Win, .308 Winchester Magnum. You can buy with confidence — McRee’s Precision offers a Half-MOA Accuracy Guarantee with its pre-fitted barrel kits.

Mcree Precision Mcrees Savage Remington pre-fitted pre-chambered pre-fit barrel system kit nut
The stainless steel Barrel Nut is set up for 1 1/16 x 16 barrel threads, while the stainless steel recoil lug has a 1/8 inch removable locator pin and is set up for 1.0625 dia barrel threads.

McRee’s Precision sells Rem-action Pre-Fit barrel packages (complete with barrel nut, recoil lug, and wrench) starting at $489.52. Choose from five chamberings: 6.5 Creedmoor, 6mm Creedmoor, .243 Win, .308 Win, and .300 Win Mag. These Pre-Fit barrel kits come ready-to-install. All you need to do is remove your current barrel, place the recoil lug, spin on the new tube, follow the instructions for setting head-space with standard go/no-go gauges, then torque the barrel nut against the lug. NOTE: You may require a barrel vise and action wrench to remove the original barrel. Chambering-specific headspace gauges required. Minor inletting changes may be needed forward of the action.

Mcree Precision Mcrees Savage Remington pre-fitted pre-chambered pre-fit barrel system kit nut

The folks at McRee’s Precision say their Pre-Fit system offers many advantages: “Remington Pre-Fitted Barrel Kits have become popular over the years. If Savage can do it, why not for our Remingtons? Our [Criterion-supplied] barrels are spec’d to the McRee standard of performance. There are several places to get the tools required to remove your factory barrel correctly. Once you have your barrel removed all you have to do is follow the normal Savage procedure to install your new barrel. We recommend that you contact your local gunsmith for the install. Feel free to call us with any questions.”

Product Tip from Ed LongRange. We welcome readers’ submissions.
Permalink Gear Review, Gunsmithing, Tech Tip 1 Comment »
August 3rd, 2019

6mm Creedmoor Built with Howa Action and KRG Bravo Chassis

Gavin Gear 6mm Creedmoor Howa 1500 KRG Bravo chassis stock

The 6mm Creedmoor has become one of the most popular cartridges for PRS/NRL competition, and it also works great in the varmint fields. There are many 6mm Creedmoor factory rifle options now, such as the Savage Model 10 in GRS stock and the Ruger Precision Rifle (6mm Creedmoor).

Do-It-Yourself 6mm Creedmoor Rifle Project — UltimateReloader.com
Another cost-effective option for 6mm Creedmoor fans is to build your own rifle, starting with a Howa barreled action. The Howa 1500 is a mag-fed, flat-bottomed bolt action that ships with the excellent HACT 2-stage trigger. Howa barreled actions are available with a variety of barrel lengths and contours, starting at about $430.00 at Brownells. There are quite a few good stocks/chassis systems now offered for Howa 1500 actions, including the excellent KRG Bravo Chassis, which features an ergonomic composite outer shell over a precision-machined inner chassis.

Gavin Gear 6mm Creedmoor Howa 1500 KRG Bravo chassis stock
Gavin Gear fitted a KRG enclosed fore-end and Mystic Precision MPOD to his 6mm Creedmoor rifle.

Our friend Gavin Gear of UltimateReloader.com has built a nice 6mm Creedmoor rifle using a Howa 1500 heavy-barreled action and KRG Bravo Chassis. This project has proven very successful. The rifle has shown impressive accuracy and outstanding reliability. Gavin hopes to use this rifle in practical/tactical competitions later this year.

In this video, Gavin fits KRG’s enclosed fore-end to the KRG Bravo chassis. This accessory fore-end features a top Picatinny rail and various attachment options on the sides and lower section. Here you can see the enclosed fore-end (upper right) next to the factory forend included with the KRG Bravo (lower left):

Gavin Gear 6mm Creedmoor Howa 1500 KRG Bravo chassis stock

Gavin then fits a Mystic Precision MPod from EGW. This stable, wide-base bipod uses a T-Slot rail for rifle attachment, and has legs that adjust independently for height. The video shows the rifle coming together step-by-step. This is something the average guy can do with simple tools — no gunsmithing is required, because the Howa barreled action is pre-chambered for the 6mm Creedmoor cartridge.

In the video above Gavin unboxes his Howa 1500 barreled action from Brownells. He then mounts the barreled action to the KRG Bravo stock, checking the torque levels. Next Gavin borescopes the hammer-forged barrel (5:55) noting: “What I saw I liked — there are practically no tooling marks. The finish on the lands and grooves looks really good”. Lastly, Gavin tested the trigger with his TriggerScan TS-11 (6:24), confirming a two-stage pull weight of about 2.25 pounds out of the box.

6mm Creedmoor Lapua cartridge brass

Permalink - Articles, - Videos, Gunsmithing, Tactical 1 Comment »
August 3rd, 2019

NRA Rifle Championships at Camp Atterbury — 2019 Schedule

Camp Atterbury Indiana high Power Championship

Many of the best rifle competitors in the United States will be heading to Indiana next week to compete at the 2019 NRA National High Power Rifle Championships which commence Monday, August 5, 2019. The Across-the-Course Championship, Mid-Range Championship, Long Range Championship, and Extreme Long Range Championship will all take place August 5-21, 2019 at Camp Atterbury, near Edinburgh, Indiana.

Camp Atterbury Indiana high Power Championship

GET 2019 High Power Rifle Championships PROGRAM HERE »

Camp Atterbury National NRA High Power championships 2019 program free

Day By Day Planner for 2019 Nationals at Camp Atterbury

Monday, August 5 will be the First Shot Ceremony, and squadded practice will also begin.

Tuesday, August 6 marks the beginning of the Team Matches. They will conclude on August 7.

Thursday, August 8 is the start of High Power Across the Course competition. They last until August 11.

Monday, August 12 is the Mid Range Team Championship, lasting until August 13.

Tuesday, August 13 is the first day of the Mid Range Individual Championship. They last until August 16.

Saturday, August 17 will be the Palma Team Match day.

Sunday, August 18 begins the Long Range Championship which continues through August 21.

Wednesday, August 21 is the registration day for the NRA Extreme Long Range Championship. The match will be fired over the next two days, finishing on August 23.

Email nrahighpower@nrahq.org for more information.

Camp Atterbury Indiana high Power Championship

View Schedule for ALL 2019 NRA National Championships »

Lodging at Camp Atterbury and Nearby
Camp Atterbury offers on-base lodging — rooms and cabins will be available to all competitors 18 and over. Camp Atterbury lodging includes suites and standard rooms as well as the MWR Campground and the MWR Cabins. Lodging is controlled by the Camp Atterbury Lodging Office, not by the NRA. Entry fees DO NOT include lodging costs. There are also a number of hotels nearby, including Charwood Suites. Nearby campground Johnson County Park also offers special rates for High Power competitors.

With the CMP hosting important matches next year at Camp Perry, many rifle competitors will be “commuting” between the two venues this summers, driving 4.5 hours from Indiana to Ohio.

Map Camp Perry Camp Atterbury Ohio Indiana

Permalink Competition, News, Shooting Skills No Comments »
August 2nd, 2019

Learn Marksmanship from 3-Time Nat’l Champion Brandon Green

USAMU Basic Riflemans Course SFC Brandon Green High Power Shooting Training

The U.S. Army Marksmanship Unit (USAMU) has produced an excellent series of videos, which collectively cover the Basic Rifleman’s Course. If you are getting started in High Power shooting, or want to improve your position shooting skills, this series is well worth watching. And these videos are not just for service rifle shooters — even bench shooters can benefit from these videos, particularly Part 5, which explains how to estimate wind speed and direction. The lead instructor for these videos is SFC Brandon Green, the reigning National High Power Champion, and Service Rifle Champion at the 2017 CMP Trophy Matches. When SFC Green talks, you should listen.

SFC Brandon Green is a shooting superstar. Green won his third NRA National High Power Rifle Championship in 2018 at Camp Atterbury, Indiana. He dominated the HP Championship cycle, finishing eight points and ten Xs ahead of his nearest competitor. Brandon also won High Power National Championships in 2015 and 2013. And in 2017 he set new records at the CMP’s National Trophy Matches at Camp Perry. One of the greatest marksmen in the nation’s history, SFC Green has no weaknesses, excelling at all positions, both rapid-fire and slow-fire.

Part 5 — Wind and Weather Estimation (Very Useful for All Shooters)


Note: This video includes a hit location “target analysis” in the first 6 minutes.

Part 4 — Minute of Angle Explained

Part 3 — Ballistics and Zeroing

Part 2 — Positions, Sight Alignment, and Natural Point of Aim (Very Useful)

USAMU Basic Riflemans Course SFC Brandon Green High Power Shooting Training

Part 1 — Aiming and Sight Picture

SFC Brandon Green 2017 CMP Camp Perry USAMU Service Rifle
Three-time National High Power Champion SFC Brandon Green (left above) set four new
National Records at Camp Perry in 2017.

Permalink - Videos, Competition, Shooting Skills No Comments »
August 2nd, 2019

Huge Discounts on Burris Scopes — And $500 Off Eliminator III

Burris Sale discount Eliminator 3 III laser rangefinder scope

Need a good scope for PRS, hunting, or varminting? Burris just announced a massive discount campaign that can save you hundreds of dollars on a new scope purchase. Incentives range from $500 in savings with the purchase of a Burris Eliminator III laser range-finding riflescope to $180 with the purchase of a Burris Fullfield II and $210 with the purchase of a Fullfield E1.

The Eliminator III just went on sale for $999 — that’s $500 off MAP! Buy from Burris with FREE SHIPPING or find a participating retailer. Offer good while supplies last.

Burris Sale discount Eliminator 3 III laser rangefinder scopeBurris Eliminator III SALE
The Burris Eliminator III 4-16x50mm smart riflescope is now available for $999, a $500 savings off MAP (Minimum Advertised Price).

The Burris Eliminator III is an advanced electro-optical device that combines magnified optics with a built-in laser rangefinder and micro-processor. With the push of a button, the Eliminator III ranges your target. Then the micro-processor “brain” instantly calculates the required holdover for that distance, and displays a red dot on the reticle. Simply put the red dot on the center of your target and pull the trigger. The Eliminator includes an inclinometer, integrated smart dope card, and rangefinder rated to 1200 yards on reflective objects.

Who Should Use the Eliminator III?
For folks doing high-volume prairie dog and varmint shooting, we like the Burris Eliminator III. Just push a button, and the scope determines the distance to the target, calculates the hold-over, and then displays a red aiming point in the reticle. We have used the Eliminator and it worked well on critter-sized targets out to 600 yards, and deer-sized targets further out. Burt remember, you still have to make the right wind call!

Burris Fullfield Series Optics Discounts

Burris Fullfield E1 III discount hunting scope

Burris is also offering big discounts on Fullfield II and Fullfield E1 series scopes. You can now save as much as $210.00 or 45% of the original price. The Fullfield II are good hunting optics with 3X zoom range. Fullfield E1 scopes feature ballistic drop compensating reticles. The Burris website states: Savings are available immediately at retail — no rebate paperwork required!” Here are the deals available through December 31, 2019:

Burris Fullfield II
3-9x40mm was $209, now $159, SAVE $50 item #200162
4.5-14x42mm was $299, now $189, SAVE $110 item #200183
6.5-20x50mm was $399, now $219, SAVE $180 item #200193

Fullfield E1
3-9x40mm was $279, now $189, SAVE $90 item #200320
4.5-14x42mm was $379, now $219, SAVE $160 item #200338
6.5-20x50mm was $499, now $289, SAVE $210 item #20034

Permalink - Videos, Hot Deals, Optics 1 Comment »
August 2nd, 2019

Walther 30-Day Money Back Guarantee for PPQ and PPS Pistols

Walther USA pistol ppq pps m2 q5 polymer steel-framed

30-day Money Back Guarantee. We’ve seen that for some home appliances and cleaning products, but never for firearms. Walther may be the first pistol-maker to allow you to own a modern handgun for a full month and then send it back for a complete refund. That’s right, you can purchase any new Walther PPQ or PPS, and use it for 30 days. Then, Walther declares: “If you don’t love it, return it on us.” Yep, Walther will even pay for the return shipping. If the pistol does not fully meet expectations, return it to Walther for a full refund of the purchase price, including tax and shipping.

Walther’s Marketing V.P. Bret Vorhees explains: “Consumers are often hesitant to put down their hard-earned money on a firearm purchase, simply because if they don’t like it, they are stuck with the product. Walther is proud to be the first company to guarantee customer satisfaction our of our pistols… giving the consumer more options”.

Here is how the gun industry’s first 30-day, money-back guarantee for pistols works. After purchasing a new PPQ or PPS handgun from a licensed FFL dealer, the buyer can take the gun home and shoot as much as he/she wants for up to 30 days. Whether you buy the new pistol from a local gun shop or an online retailer, the pistol qualifies for the guarantee. If the pistol does not fully meet expectations during the initial 30-day period, the purchaser can return it to Walther for a full refund of the purchase costs, including tax and shipping. This applies only to the first purchaser of a NEW PPQ and/or PPS pistol.

The return process is simple, follow these easy steps:

1. Visit WaltherOwnersClub.com and click “Return a Firearm”.
2. Fill out the form with your contact information.
3. Upload a copy of your receipt or proof of purchase.
4. Submit the form and print authorized return shipping label.
5. Pack unloaded firearm in original case, and deliver to Fedex location.

Walther says purchasers who follow these procedures should receive their refunds within two weeks. This offer applies to all Walther PPS and PPQ models, including the newer PPS M2 series, and the outstanding PPQ Q5 match pistols (see below):

Walther USA pistol ppq pps m2 q5 polymer steel-framed

Permalink Handguns, Hot Deals No Comments »
August 1st, 2019

Win Big Prize Packages with August Gearbox Giveaways

Gearbox Giveaway Contest August

To help celebrate National Shooting Sports Month (NSSM), rifle and gear manufacturers are offering big prize packages — the Gearbox Giveaways. Enter to win rifles, pistols, ammo, and other valuable prizes. Many of the Gearbox packages are worth over $3000 with the most valuable package worth over $5000! Enter as many of the Gearbox Giveaways as you choose. You can’t win if you don’t enter.

You’ll find all the Gearbox Giveaways on the NSSF website. Shown below are TEN current Gearbox Giveaways ranked in order of value — starting with the most valuable prize package. Good luck!

Gearbox GiveAway Page — SEE ALL Prize Packages »

Gearbox Giveaway Contest August
ENTER TO WIN FN SHOOTING SPORTS GEARBOX. MSRP $5632.00

Gearbox Giveaway Contest August
ENTER TO WIN THE MOSSBERG SHOOTING SPORTS GEARBOX. MSRP $4024.00

Gearbox Giveaway Contest August
ENTER TO WIN PHOENIX WEAPONRY SHOOTING SPORTS GEARBOX. MSRP $4002.00

Gearbox Giveaway Contest August
ENTER TO WIN SIG SAUER SHOOTING SPORTS GEARBOX. MSRP $3304.64

Gearbox Giveaway Contest August
ENTER TO WIN DANIEL DEFENSE SHOOTING SPORTS GEARBOX MSRP $2953.00

Gearbox Giveaway Contest August
ENTER TO WIN AERO PRECISION SHOOTING SPORTS GEARBOX. MSRP $2883.00

Gearbox Giveaway Contest August
ENTER TO WIN RUGER SHOOTING SPORTS GEARBOX. MSRP $2767.00

Gearbox Giveaway Contest August
ENTER TO WIN GLOCK SHOOTING SPORTS GEARBOX. MSRP $2426.99

Gearbox Giveaway Contest August
ENTER TO WIN AGUILA AMMUNITION SHOOTING SPORTS GEARBOX. MSRP $1416.00

Gearbox Giveaway Contest August
ENTER TO WIN RCBS + HOPPE’S + CHAMPION TARGET + BUTLER CREEK GEARBOX. MSRP $1376.25

Permalink Bullets, Brass, Ammo, Handguns, Hot Deals, News, Tactical 1 Comment »
August 1st, 2019

Ballistics TIP: How Altitude and Air Pressure Affect Bullet Flight

Trajectory of Bullet fired at Sea Level

Trajectory of Bullet fired at 20,000 feet

You can do your own experimental calculations using JBM Online Ballistics (free to use). Here is an extreme example, with two printouts (generated with Point Blank software), one showing bullet trajectory at sea level (0′ altitude) and one at 20,000 feet. For demonstration sake, we assigned a low 0.2 BC to the bullet, with a velocity of 3000 fps.

Suunto AltimeterOne of our readers asked “What effect does altitude have on the flight of a bullet?” The simplistic answer is that, at higher altitudes, the air is thinner (lower density), so there is less drag on the bullet. This means that the amount of bullet drop is less at any given flight distance from the muzzle. Since the force of gravity is essentially constant on the earth’s surface (for practical purposes), the bullet’s downward acceleration doesn’t change, but a bullet launched at a higher altitude is able to fly slightly farther (in the thinner air) for every increment of downward movement. Effectively, the bullet behaves as if it has a higher ballistic coefficient.

Forum member Milanuk explains that the key factor is not altitude, but rather air pressure. Milanuk writes:

“In basic terms, as your altitude increases, the density of the air the bullet must travel through decreases, thereby reducing the drag on the bullet. Generally, the higher the altitude, the less the bullet will drop. For example, I shoot at a couple ranges here in the Pacific Northwest. Both are at 1000′ ASL or less. I’ll need about 29-30 MOA to get from 100 yard to 1000 yards with a Berger 155gr VLD @ 2960fps. By contrast, in Raton, NM, located at 6600′ ASL, I’ll only need about 24-25 MOA to do the same. That’s a significant difference.

Note that it is the barometric pressure that really matters, not simply the nominal altitude. The barometric pressure will indicate the reduced pressure from a higher altitude, but it will also show you the pressure changes as a front moves in, etc. which can play havoc w/ your calculated come-ups. Most altimeters are simply barometers that read in feet instead of inches of mercury.”

As Milanuk states, it is NOT altitude per se, but the LOCAL barometric pressure (sometimes called “station pressure”) that is key. The two atmospheric conditions that most effect bullet flight are air temperature, and barometric pressure. Normally, humidity has a negligible effect.

It’s important to remember that the barometric pressure reported on the radio (or internet) may be stated as a sea level equivalency. So in Denver (at 6,000 feet amsl), if the local pressure is 24″, the radio will report the barometric pressure to be 30″. If you do high altitude shooting at long range, bring along a Kestrel, or remember to mentally correct the radio station’s pressure, by 1″ per 1,000 feet.”

If you want to learn more about all aspects of External Ballistics, ExteriorBallistics.com provides a variety of useful resources. In particular, on that site, Section 3.1 of the Sierra Manual is reprinted, covering Effects of Altitude and Atmospheric Pressure on bullet flight.

Permalink Bullets, Brass, Ammo, Tech Tip 2 Comments »