Coating bullets with a friction-reducing compound such as Molybdenum Disulfide (Moly) offers potential benefits, including reduced barrel heat, and being able to shoot longer strings of fire between bore cleanings. One of the effects of reduced friction can be the lessening of internal barrel pressures. This, in turn, means that coated bullets may run slower than naked bullets (with charges held equal). To restore velocities, shooters running coated bullets are inclined to “bump up” the load — but you need to be cautious.
Be Careful When Increasing Loads for Coated Bullets
We caution shooters that when your start out with coated bullets in a “fresh barrel” you should NOT immediately raise the charge weight. It may take a couple dozen coated rounds before the anti-friction coating is distributed through the bore, and you really start to see the reduced pressures. Some guys will automatically add a grain or so to recommended “naked” bullet charge weights when they shoot coated bullets. That’s a risky undertaking.
Instead we recommend that you use “naked” bullet loads for the first dozen coated rounds through a new barrel. Use a chronograph and monitor velocities. It may take up to 30 rounds before you see a reduction in velocity of 30-50 fps that indicates that your anti-friction coating is fully effective.
We have a friend who was recently testing moly-coated 6mm bullets in a 6-6.5×47. Moly had not been used in the barrel before. Our friend had added a grain to his “naked” bullet load, thinking that would compensate for the predicted lower pressures. What he found instead was that his loads were WAY too hot initially. It took 30+ moly-coated rounds through the bore before he saw his velocities drop — a sign that the pressure had lowered due to the moly. For the rounds fired before that point his pressures were too high, and he ended up tossing some expensive Lapua brass into the trash because the primer pockets had expanded excessively.
LESSON: Start low, even with coated bullets. Don’t increase your charge weights (over naked bullet loads) until you have clear evidence of lower pressure and reduced velocity.
Procedure After Barrel Cleaning
If you shoot Moly, and clean the barrel aggressively after a match, you may want to shoot a dozen coated “foulers” before starting your record string. Robert Whitley, who has used Moly in some of his rifles, tells us he liked to have 10-15 coated rounds through the bore before commencing record fire. In a “squeaky-clean” bore, you won’t get the full “benefits” of moly immediately.
To learn more about the properties of dry lubricants for bullets, read our Guide to Coating Bullets. This covers the three most popular bullet coatings: Molybdenum Disulfide (Moly), Tungsten Disulfide (WS2 or ‘Danzac’), and Hexagonal Boron Nitride (HBN). The article discusses the pros and cons of the different bullet coatings and offers step-by-step, illustrated instructions on how to coat your bullets using a tumbler.
Grizzly Industrial and Bullets.com President Shiraz Balolia pulled off a stunning feat of marksmanship recently, winning his third straight F-Open title at the Canadian F-Class National Championships. It wasn’t easy — conditions were tough, as was the competition — there were top shooters from around the world, including many past U.S. Champions. Shiraz had a slim, one-point lead after Day 2, but Balolia ended up tied on total points (and V-Count) with Emil Kovan at the end of the third and final day. But when the cards were compared, a string of Vs on Day 3 secured Shiraz the win via tie-breaker. Thus Shiraz achieved the memorable “three-peat”, winning Canada’s 2016 F-Open National Championship to complement his 2015 and 2014 victories.
Three-Peat at Connaught — 2016 F-Open Canadian Championship
by Shiraz Balolia This trip to Ottawa for the Canadian National Championship was a specially important one. The U.S. Team tryout process and practice was to take place for two days prior to the National Championship as the next F-Class World Championship is going to be held in Ottawa in August of 2017.
Connaught Range is a fantastic range that is very well run. Pullers are provided as part of your entry fee and matches are run at different times of the day, even into the evening. The flags are heavier than the ones we use in USA and are notorious for lying to the shooter. Matches are shot in pair firing mode which means one shooter takes a shot and the other scores. You cannot simply rattle off a shot as soon as the target comes up.
Crazy Hot Conditions at the Connaught Range
The first day the winds were mild, but tricky and the temperature was 102° F. I had never shot in such weather and ended up in the 6th place for the day. The second day had several matches at 900 meters and the wind picked up, with a 105° F recorded temperature, causing havoc with everyone. In one of my matches at 900 meters I took my two sighters and my first shot for record was a 3 (equivalent to an 8 in USA). To top it off I shot another 3 a few shots later. Liar, Liar, flags on fire! Anyway, I dropped 7 points in that match only to find out some very good shooters had dropped over 10! I moved to top position for the two-day Aggregate.
The third and final day was one string of 20 shots with shooters squadded by their two-day Aggregate ranking. So I was paired with Emil Kovan, while the third position shooter was paired with the fourth-ranking shooter et cetera. We all shot in identical conditions.
Après Moi, le Déluge — Not Your Gentle Drizzle
Then came a vicious rainstorm. We waited out the storm for two hours before we shot. The rain was really, really nasty and coming down really hard. We were all huddled under the U.S. Open Team’s tent.
Shiraz and Emil Battle to the End…
Finally, after the long delay, we got back to the firing line. And it went down to the wire. Emil shot a 100 with 3 Vs and I shot a 99 with 12 Vs. When the dust settled, we ended up with the same score and total V-Count (611-61V). The tie would be resolved by a “count-back” procedure. I had a stack of Vs at the end of my string and that won the match. What a fight!
Shiraz told us that this third championship was the toughest: “A while back, I had rotator cuff surgery on my shooting arm and had not shot a match in 9 months. I barely was able to test loads for three weeks before I shipped my ammo and did not know what to expect.” He says that winning “did not even sink in for a few days and looking back, I think this will be something I will cherish forever.”
Shiraz’s win came against very tough competition. Shiraz notes: “The whole U.S. Team, the whole Canadian Team, many South Africans, Germans, British, Ukrainians and others were present. We had several past US National Champions present as well and it was a great honor to shoot with all of them.”
Note: This is a photo from 2013, there may be slight changes in the rifle.
The rifle features a BAT Machine ‘M’ action, with a 31″, 1:10″-twist Bartlein barrel. The scope is a March 10-60x52mm, which sits on a +20 MOA angled rail. The primary stockwork, including fitting of the adjustable cheek-piece and buttplate, was done by Alex Sitman of Master Class Stocks. Shiraz customized the stock with finger grooves, fore-end channel, and a bottom rear slide. Shiraz did the final stock finishing as well.
Gun Components
BAT Machine Action
Master Class Stock, modified by Shiraz
Bartlein Barrel, 1:10″ Twist, 31 inches long
Fitted Barrel Harmonic Tuner
March 10-60x Scope with fine crosshair and 3/32″ dot
Caliber & Load
.300 Winchester Short Magnum (WSM)
215gr Berger Hybrid bullets, 2870 FPS
Norma .300 WSM Cases
H4831SC Powder
Tula (Russian) Primers
NOTE: Shiraz was not running anywhere near max: “I chose a light load for Ottawa due to the range limits as my other accurate node is 100 FPS faster and almost at the range limit.”
At the request of our readers, we provide select “Deals of the Week”. Each week we offer our Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
LABOR DAY HOLIDAY SPECIALS
We are publishing our Deals on Sunday this week because many of the best bargains are Labor Day Weekend Specials. There are also Special 10% OFF PROMOTIONS running this weekend. We want readers to be able to take advantage of these holiday specials before the discount codes “time out”.
1. Brownells — Labor Day Weekend Sale & Free Shipping ($99+)
Brownells is offering great pricing on a host of products this weekend. You’ll find bargains on Berger Bullets, RCBS Rockchuckers, AR components, Timney Triggers, Magpul Stocks, Rimfire Ammo, Centerfire Ammo, Range Bags, and more. Plus all Geissele products are on sale this holiday weekend. In addition, with CODE L27 you can FREE Ground Shipping on orders over $99.00. This free shipping offer expires on 9/5/2016 at 11:59 PM CST. CLICK HERE for Labor Day Specials.
2. Amazon — Vortex 4-12x50mm AO Scope, $174.00
The NRA is introducing a new Mid-Range Tactical Prone Match for AR platform rifles with bipods. Optics up to 12X will be allowed. If you’re considering participating in this new Mid-Range competition, here’s a fine Vortex 4-12x50mm AO Crossfire II scope for under $175.00. That’s a steal. This second-focal-plane scope features front parallax adjustment and a BDC reticle. Put the money you save on optics into a premium barrel and quality match trigger.
3. Ammomen — Winchester .22 LR Ammo $15.50 for 235 Rounds
We are finally starting to see .22 LR rimfire ammo come down to very affordable levels. With this Winchester bulk pack special you get 235 rounds for just $15.50. That works out to just 6.6 cents per round (or $3.30 for 50 rounds). This .22 LR ammo is loaded with 36 grain copper-plated lead HP bullets. The ammo is rated at 1280 fps in rifles, 1085 fps in pistol.
4. Savage Arms — Rifle Rebates up to $75.00
With the Save on a Savage Rebate, you can get $75.00 on Savage Trophy Hunter, DOA Hunter, Model 14/114 or Model 16/116; or get $30.00 back on any AXIS or A17™ synthetic stock rifle. Shooters who purchase any bolt-action Savage rimfire, including the B.MAG and Rascal, will be eligible for a $25 mail-in rebate. Firearms must be purchased between August 11, 2016 and September 25, 2016. NOTE: This program also includes the popular semi-auto A17 17 HMR which was voted ‘Rifle of the Year’ by both NRA American Hunter and Guns & Ammo magazines. CLICK HERE for Rebate Coupon.
5. Cabelas — 10% Off Labor Day Special with Free Shipping
Act quickly guys, this Cabelas.com offer expires 9/5/16, at 11:59 pm Eastern Time. Throughout the Labor Day Weekend you can get 10% off most online merchandise, plus FREE Shipping for orders over $99.00. This includes ammo purchases, but not firearms. This is an online-only promotion, not valid at Cabela’s retail stores. Use Code 6TENOFF during online checkout. Some heavy or oversized items will require paid shipping and handling.
6. Amazon — Leight MAX NRR33 Earplugs, $7.50 for 50 Pairs
These Howard Leight NRR33 Max plugs are your Editor’s favorite foam earplugs. Between shooting, motorcycling and mowing lawns, I probably have Max plugs in my ears 2-3 days a week. This is a very good price for a bulk pack of 50 pairs. And if you act soon, you can get free shipping to boot.
7. Beretta USA — Labor Day Sale, Up to 60% Off
Beretta is offering big discounts — up to 60% Off — during its Labor Day Outlet Store Sale. You can save on shooting accessories, clothing, gun cases, holsters, gunstocks, choke tubes, barrels, scope rings, grips and much more. You’ll also find great deals on Tikka and Sako stocks (Beretta is the distributor for Tikka and Sako). For example, a high-grade Sako 75 Hunter DLX stock is marked down from $878.00 to $439.00. In addition, Beretta is offering Free Shipping on Orders over $89.00.
8. Precision Reloading — $15 Hazmat Fees on Powder and Primers
If you’re purchasing powder, primers and other Hazmat items, you can save up to $25.00 per order with this offer from our friends at Precision Reloading. Some vendors charge as much as $40.00 for Hazmat fees (on top of regular shipping). This fall Precision Reloading is lowering its Hazmat charge to just $15.00 per order. And yes, you can combine powder and primers in the same order. NOTE: Normal shipping charges apply, and total package weight may not exceed 70 pounds.
If you have a 6.5 Grendel rifle and recently purchased ammunition from Prvi Partizan (PPU), do NOT LOAD or shoot this ammunition. PPU, the manufacturer, is recalling ALL of its 6.5 Grendel ammunition.
This recall applies to ALL PPU-made 6.5 Grendel ammunition.
DO NOT USE OR SELL THE FOLLOWING PRODUCTS:
PRVI 6.5 Grendel Ammunition Box
PP6.30 6.5 Grendel FMJBT 110-grain
PP6.31 6.5 Grendel HPBT 120-grain
According to PPU: “Because of different chamber sizes in certain rifles, 6.5 Grendel cartridges may be subjected to excessive chamber pressure. Use of these products may result in firearm damage and possible serious personal injury.”
If you have any 6.5 Grendel ammunition or brass manufactured by PPU, please email info@ppu-usa.com or call (203) 375-8544 to arrange for its return and replacement.
Emil Kovan is one of the top F-Class shooters in the world. He won the 2014 United States F-Open Championship. Earlier this month Emil finished second in F-Open Division at the 2016 Canadian National F-Class Championship in Ontario. Emil actually tied Open-class winner Shiraz Balolia for overall score AND “V”-count, but Emil was awarded second on the tie-breaker.
“What are the best components for an F-Open class rifle, and why?” That’s a question that I get asked all the time and will try to answer in this article. Two months ago, I was contacted by Duane, a gentleman I met at the 2015 F-Class Nationals. He was interested in building a rifle with the new Master Class Low Profile F-Open Stock, created by Carl Bernosky and Alex Sitman of Master Class Stocks.
I have known Alex Sitman for many years, and use his stocks exclusively, but was not very familiar with his new Low Profile F-Open stock. After a brief conversation with Alex, I placed an order, and had the stock inletted and bedded at my shop in a month. My first impression was “Wow that’s a long stock” — the forearm is significantly longer than on the original Master Class F-Class prone stock. I bolted the barreled action in, and squeezed the end of the forearm and barrel together, the stock flexed a little bit, but not as much as other designs that I have tested. I think that’s due to having “more meat” in the receiver area. The full stock depth continues farther forward that on some other “low profile” designs. That makes the stock stiffer in the vertical plane, reducing the hinging effect forward of the action. The stock was finished in gloss black per the customer’s request. Interestingly, I found that the multiple layers of paint and clearcoat stiffened the stock up quite a bit.
CLICK IMAGE below for full-screen version
Low Center of Gravity Tames Torque
Compared to the original Master Class F-Open stock, the barrel sits about an inch lower. Lower center of gravity equals less torque, and that is very important when shooting heavy bullets in fast twist barrels. Another significant improvement is that the toe of the stock is flat and parallel to the forearm. I added a 3/4″ track rail in the rear, and milled the underside of the fore-end to create two parallel “rails” in the front to help the stock track better.
One of the biggest reasons why I like Master Class stocks, is the pistol grip. I don’t shoot “free recoil” and a comfortable pistol grip is super important to me when selecting a stock. The new Master Class Low Profile stock shares the same grip as the old model. This allows the stock to accommodate either a “hard hold” style or a more free-recoil style of shooting — whatever the rifle’s owner prefers. This design versatility is one reason I recommend Master Class stocks. Shooters may experiment with either shooting style to find what suits them best.
Cartridge Choice — A 40° .284 Win Improved
Duane decided to have the barrel chambered for my 284 KMR IMP (Improved) wildcat. What is .284 KMR IMP and why choose it over the straight .284 Winchester? Improved by definition means “made better”, I took a great cartridge, and modified it to increase capacity, reduce pressure, and increase brass life.
There are many “improved” variants of the original .284 Winchester: 7mm Walker, .284 Shehane, .284 Ackley and so on. My version, the 284 KMR IMP, shares the .010″ blown-out sidewalls of the .284 Shehane, but I have further increased the case capacity by changing the shoulder angle from 35 to 40 degrees. The 284 KMR IMP allows you to almost match magnum cartridge velocity in a standard-bolt-face action. If you want to run 180gr-class 7mm bullets over 2900 FPS, it is cheaper and more convenient to have a barrel chambered in 284 KMR IMP than to spend $650 for a magnum bolt.
Tuning Loads for the .284 Win Improved Cartridges
The 284 KMR IMP seems to have two nodes, one around 2820 fps and other at 2940 fps. My match load clocks at 2935 fps with single-digit ES. Note –I selected that load based on accuracy, NOT raw speed. A lot of novice (or hard-headed) shooters make the mistake to push their cartridges to the max, and disregard more accurate loads at lower velocity.
The sport of F-Class is rapidly growing, and the equipment used is improving constantly. I remember that only few years ago, an F-Open rifle that could shoot sub-one-inch of vertical at 300 yards was considered competitive. Now, we are pursuing sub-one-inch vertical at 600 yards! It takes a great rifle to approach that goal, but it is also up to the shooter to learn and experiment as much as possible in order to achieve success.
Dies for an Improved .284 Win Cartridge
One of the biggest challenges in campaigning a wildcat cartridge has been obtaining great dies. When searching for custom dies, it almost seems like that the odds are stacked against us. The most common problem is wait-time — custom die orders can take months to be completed. Also, most custom die makers want you to send them two or three cases, each fire-formed three times. I find that funny because if could somehow properly size the cases for three fire-forming cycles, I would not need a sizing die.
Custom-made dies should size the case just right, but sometimes the die’s internal dimensions are slightly off, and this leads to problem number two: dies sizing too much (or even worse) too little. I had a one “custom” die that would not size the bottom of the case enough. This made the extraction of fired cases very difficult. I feel that the best option (if available) for shooters interested in wildcat chambers is to have their gunsmiths make the dies. I offer that die-making service in addition to barrel chambering.
BAT Machine “M” Action
Duane decided to use a BAT M action for this rifle, and I think that he could not have made a better choice. We are blessed with many good match-quality receivers: Barnard, BAT, Borden, Kelbly, Nesika, and Stiller just to mention a few. These are all very well-made and suitable for F-Class. Among BAT Machine Co.actions, I like BAT models M, MB, and 3LL best. I prefer these because because of their size (large bedding footprint) smoothness, timing, options available, and last but not least visual appearance.
Trigger: I recommend and use Jewell triggers. Other good options are: Kelbly, CG Jackson (good 2-Stage) Anschutz (best 2-Stage for Bat and Kelbly actions), Bix’N Andy, and David Tubb.
Barrel: Duane made another good choice here. He decided to go with a Brux 1:8.5″-twist, 4-groove cut-rifled barrel. If you look at the F-Class and Long Range benchrest equipment lists, you will see that cut-rifled barrels are currently dominating. Many records have been shot with both button-rifled, and cut-rifled barrels. I have shot both, and prefer cut-rifled barrels. I am not saying that button-rifled barrels are not capable of shooting as well as cut-rifled barrels, but on average, in my experience, four out of five cut-rifled barrels (from top makers) will shoot well, vs. three out of five buttoned barrels. YMMV, but this is what I’ve observed.
Scope: Duane’s rifle was fitted with a Nightforce 15-55x52mm Competition scope with DDR-2 reticle. This optic is ultra clear, reasonably lightweight (28 oz.), super reliable, and has 1/8 MOA clicks — what you want for long range F-Class competition. In this 15-55X NF model, I like the DDR-2 reticle best, because fine cross hairs (FCH) are hard to see in heavy mirage. The DDR-2 has a heavier horizontal line, with a center dot. March scopes are also very popular and very well-made.
Thanks for reading, and keep ‘em in the middle…
Emil Kovan Competition History:
– 2014 F-Class Open National Champion
– 2016 F-Class Open Canadian Championship, Silver Medal (tied for first on score)
– 2015 F-Class Open National Championship, Silver Medal
– F-Class Open National Championship Teams, 2015, 2014, 2013, Shooting Team Member
– Over 15 wins in Regional and State Championships in Palma, F-TR, F-Open
At the request of our readers, we provide select “Deals of the Week”. Every Monday morning we offer our Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.
1. Natchez — Special 5 Reloading Press Kit, $199.99
This is an excellent entry-level reloading kit, which is on sale for $199.99 at Natchez Shooters Supplies. We like the relatively compact Special 5 press for most reloading duties. Eventually you may want to add an additional, large heavy press, but this will get the job done. This kit includes an RCBS Powder Measure, Digital Scale, Powder Trickler, Hand Priming Tool, Load Manual, Loading Tray, and more. It’s hard to beat this combination of tools for under $200.00.
Walker’s new Razor-X and Razor-XV operate like electronic muffs — allowing you to hear commands and conversations while still blocking loud noises. The Razor-X combines a collar unit (containing the electronics) with retractable, foam-tipped ear buds. Unlike conventional earmuffs, the Razor-X system doesn’t interfere with your cheek weld. The patent-pending earbuds provide an impressive 31dB of noise reduction, with the ability to hear commands. To ensure a good fit (for best noise reduction), the Razor-X and Razor-VX come with two styles of noise-reducing foam tips. An AC wall adapter with USB port and a one-meter micro USB cord is provided. READ Razor-X User Reviews.
We like reactive targets. It’s fun to “ring steel” and see a target move instantly when hit. For just twenty bucks (including shipping), it’s hard to go wrong with this 8″ AR500 Steel Gong. The 8″-diameter size is big enough for zeroing at 200 yards, yet offers a nice challenge at 500 yards and beyond. There is also a 6″-diameter model for $16.00.
4. Cabelas — Big Ammo Sale Plus FREE Shipping
Right now, Cabela’s is running a big sale on all types of ammunition from major manufacturers. Save as much as 20% off regular pricing. For example, Winchester 9mm pistol ammo is marked down from $13.99 to $11.99 for 50 rounds. And PMC X-Tac 5.56×45 ammo is reduced from $9.99 to $8.49 for 20 rounds. Plus, you can get FREE SHIPPING on all orders of $99.00 or more. Use Code 86BUY during checkout (code valid through 8/31/2016).
5. Kelbly.com — 15% Off Discount on All Products
Looking for a Panda or Atlas Action, or a complete match rifle? Here’s a great promotion from our friends at Kelbly’s. Now through Tuesday, August 23, 2016 you can get 15% of ANYthing on the Kelblys.com website. That includes rifles, actions, stocks, barrels, scope rings, muzzle brakes, Berger bullets, accessories and more. To save big, use code 15ALL at checkout. Don’t delay — this offer expires at 11:59 pm on September 1, 2016.
6. Midsouth — Complete Case Tumbling Kit, $73.70
This brass tumbling system contains everything you need to clean your cartridge brass: Vibratory Case Tumbler, Rotary Media Separator, 6 lbs. of Corn Cob Media, and 8 oz. of Brass Polish. Right now this whole system is on sale at Midsouth for just $73.70. The case tumbler, which holds 450 .223 Rem cases or 1000 9mm cases, has a three-year motor warranty. This is a good deal for the package. You could pay $65.00 for a good vibratory Tumbler by itself.
7. Natchez Shooters Supply — 325 Rounds .22 LR Ammo, $22.99
This Federal .22 LR ammo is just 7 cents per round — the kind of pricing on bulk rimfire ammo we used to see in the “good old days”. Act quickly, this $22.99 Federal .22 LR Ammo deal won’t last long. Each box contains 325 rounds — enough ammo for many sessions at the range. The bullets are 40 grains, solid lead.
8. CDNN — Browning A-Bolt with Nikon Scope, $639.99 w/Rebate
Right now you can get a nice, wood-stocked Browning A-Bolt III Hunting rifle in .308 Winchester for just $689.99. And, to sweeten that deal, the current “Browning Benjamins” Rebate program knocks $50.00 off, so the price (with rebate) is just $639.99. This package includes a Nikon Buckmaster II 4-12x40mm BDC scope. This same Browning/Nikon special is available in many other chamberings for the same price: .243 Win, .270 Win, .270 WSM, 7mm-08, .30-06 Spr, .300 Win Mag.
9. Browning — Save Up to $100 on Browning Firearms (Rebates)
Now through the end of September, 2016, Browning is offering substantial cash rebates on rifles, pistols, and shotguns. Save $100.00 on a shotgun, $50.00 on a rifle, or $25.00 with this rebate offer, good on firearms purchases made by September 30th. Browning makes some pretty darn good firearms. This Editor owns a Browning Citori Shotgun and it’s a gem. CLICK HERE for details and Rebate Form.
If you ever shoot factory ammo, you should consider getting Ammo & Ballistics 5. This resource book lists over 2,600 different loads for 190 cartridge types from 17 Mach 2 up to .700 Nitro Express, including the most popular centerfire and rimfire cartridges (both rifle and handgun). There are over 1,400 tables with ballistics data for nearly all commercially-loaded hunting ammunition sold in the United States (as of 2013, the publication date). Tables include velocity, energy, wind drift, bullet drop, and ballistic coefficient.
This book can be helpful when choosing ammo for a hunt. You can quickly compare the velocity and knock-down power of various types of commercial ammo. In addition, this book can help you choose a caliber/chambering for your next hunting rig, as you can compare factory load options.
Book Purchaser Reviews
“The data contained in this book is invaluable. If you don’t understand momentum vs. energy, MER and MEPBR, this book will help you gain an understanding. If you don’t know what the Taylor Knock Out (KO) Index is, this book will enlighten and inform.” — Daryl ID
“Great heaps of data! This volume has pages and pages of new data for .22LR like the hot Velocitor, and also on the .22 WMR from 30 grains up into the 50s. Most importantly there is lots of range data, drop, windage, kinetic energy, etc. — Terrific reference guide….” — E. Svanoe
In this .308 Win test, 70° F ammo shot 96 FPS slower than ammo heated to 130.5° F. And the 130.5° ammo was 145 fps faster than ammo right out of the freezer (at 25.5° F). That’s a huge difference…
EDITOR’s NOTE: The Sierra tester does not reveal the brand of powder tested here. Some powders are much more temp sensitive than others. Accordingly, you cannot extrapolate test results from one propellant to another. Nonetheless, it is interesting to see the actual recorded velocity shift with ammo temperature variations in a .308 Win.
Written by Sierra Chief Ballistician Tommy Todd This story originally appeared in theSierra Bullets Blog
A few weeks ago I was attending the Missouri State F-Class Match. This was a two-day event during the summer and temperatures were hot one day and hotter the next. I shot next to a gentleman who was relatively new to the sport. He was shooting a basically factory rifle and was enjoying himself with the exception that his scores were not as good as he hoped they would be and he was experiencing pressure issues with his ammunition. I noticed that he was having to force the bolt open on a couple of rounds. During a break, I visited with him and offered a couple of suggestions which helped his situation somewhat and he was able to finish the match without major issues.
He was shooting factory ammunition, which is normally loaded to upper levels of allowable pressures. While this ammunition showed no problems during “normal” testing, it was definitely showing issues during a 20-round string of fire in the temperatures we were competing in. My first suggestion was that he keep his ammunition out of the direct sun and shade it as much as possible. My second suggestion was to not close the bolt on a cartridge until he was ready to fire. He had his ammo in the direct sunlight and was chambering a round while waiting on the target to be pulled and scored which can take from a few seconds to almost a minute sometimes.
This time frame allowed the bullet and powder to absorb chamber [heat] and build pressure/velocity above normal conditions. Making my recommended changes lowered the pressures enough for the rifle and cartridge to function normally.
Testing Effects of Ammunition Temperature on Velocity and POI
After thinking about this situation, I decided to perform a test in the Sierra Bullets underground range to see what temperature changes will do to a rifle/cartridge combination. I acquired thirty consecutive .30 caliber 175 grain MatchKing bullets #2275 right off one of our bullet assembly presses and loaded them into .308 Winchester ammunition. I utilized an unnamed powder manufacturer’s product that is appropriate for the .308 Winchester cartridge. This load is not at the maximum for this cartridge, but it gives consistent velocities and accuracy for testing.
I took ten of the cartridges and placed them in a freezer to condition.
I set ten of them on my loading bench, and since it was cool and cloudy the day I performed this test I utilized a floodlight and stand to simulate ammunition being heated in the sun.
I kept track of the temperatures of the three ammunition samples with a non-contact laser thermometer.
The rifle was fired at room temperature (70 degrees) with all three sets of ammunition. I fired this test at 200 yards out of a return-to-battery machine rest. The aiming point was a leveled line drawn on a sheet of paper. I fired one group with the scope aimed at the line and then moved the aiming point across the paper from left to right for the subsequent groups.
NOTE that the velocity increased as the temperature of the ammunition did.
The ammunition from the freezer shot at 2451 fps.
The room temperature ammunition shot at 2500 fps.
The heated ammunition shot at 2596 fps.
The tune window of the particular rifle is fairly wide as is shown by the accuracy of the three pressure/velocity levels and good accuracy was achieved across the board. However, notice the point of impact shift with the third group? There is enough shift at 200 yards to cause a miss if you were shooting a target or animal at longer ranges. While the pressure and velocities changed this load was far enough from maximum that perceived over pressure issues such as flattened primer, ejector marks on the case head, or sticky extraction did not appear. If you load to maximum and then subject your ammunition to this test your results will probably be magnified in comparison.
This test showed that pressures, velocities, and point-of-impact can be affected by temperatures of your ammunition at the time of firing. It’s really not a bad idea to test in the conditions that you plan on utilizing the ammo/firearm in if at all possible. It wouldn’t be a bad idea to also test to see what condition changes do to your particular gun and ammunition combination so that you can make allowances as needed. Any personal testing along these lines should be done with caution as some powder and cartridge combination could become unsafe with relatively small changes in conditions.
Long Range Success with Lapua Scenars
With the interest in ultra-long-range shooting in the USA, we thought you might like to see how they shoot out past 2000 meters in Scandinavia. Recently, a new Norwegian long range record was shot in Sokndal in Norway, at the Bøstøl shooting range, using Lapua 300 grain Scenar bullets.
With the target at 2165 meters (1.345 miles), the shooters managed 2/10 hits on steel. The cartridge (as you might expect) was the powerful .338 Lapua Magnum. The load was 89 grains of Vihtavuori N570 pushing the 300gr Scenars at 815 ms (2674 fps). The firearm used was Accuracy International .338 LM AXMC rifle with 27″ barrel and suppressor. Before the record hits at 2165 meters, the team also engaged targets at 1639m, 1710m, and 1850m scoring 4/10 hits on 95 x 100 cm steel target (that’s roughly one meter square, just over 3 feet per side).
About the Location — Sokndal, Norway
Sokndal is the southernmost municipality in Rogaland county, Norway. It is located in the traditional district of Dalane. The administrative center of the municipality is the village of Hauge. Other villages in Sokndal include Li, Rekefjord, Sogndalsstranda, and Åna-Sira.
Here’s a significant new addition to our knowledge base for Long-Range shooting. Hornady has released a new Ballistics Calculator that employs bullet profiles derived from Doppler radar testing and 3D projectile modeling. Hornady’s Patent Pending 4DOF™ Ballistic Calculator provides trajectory solutions based on projectile Drag Coefficient (not static G1/G7 ballistic coefficients) along with the exact physical modeling of projectiles and their mass and aerodynamic properties. This new 4DOF (Four Degrees of Freedom) calculator also accounts for spin drift and the subtle VERTICAL effects of crosswinds.
We strongly recommend you watch this video from start to finish. In greater detail than is possible here, this video explains how the 4DOF System works, and why it is more sophisticated than other commercially-offered Ballistics calculators. There’s a LOT going on here…
Aerodynamic Jump from Crosswind Calculated
According to Hornady, the 4DOF Ballistics Calculator “is the first publicly-available program that will correctly calculate the vertical shift a bullet experiences as it encounters a crosswind.” This effect is called aerodynamic jump. The use of radar-derived drag profiles, correct projectile dynamics, aerodynamic jump, and spin drift enable the Hornady® 4DOF™ ballistic calculator to provide very sophisticated solutions. Hornady says its 4DOF solver is “the most accurate commercially available trajectory program … even at extreme ranges.”
“Current ballistic calculators provide three degrees of freedom in their approach — windage, elevation, and range — but treat the projectile as an inanimate lump flying through the air,” said Dave Emary, Hornady Chief Ballistician. “This program incorporates the projectile’s movement in the standard three degrees but also adds its movement about its center of gravity and subsequent angle relative to its line of flight, which is the fourth degree of freedom.”
Using Doppler radar, Hornady engineers have calculated exact drag versus velocity curves for each bullet in the 4DOF™ calculator library. This means the 4DOF™ calculator should provicde more precise long range solutions than calulators that rely on simple BC numbers or drag curves based with limited data collection points. Emary adds: “The Hornady 4DOF also accurately calculates angled shots by accounting for important conditions that [other ballistic] programs overlook.”
“This calculator doesn’t utilize BCs (Ballistic Coefficients) like other calculators,” added Jayden Quinlan, Hornady Ballistics Engineer. “Why compare the flight of your bullet to a standard G1 or G7 projectile when you can use your own projectile as the standard?” That makes sense, but users must remember that Hornady’s 4DOF projectile “library” includes mostly Hornady-made bullets. However, in addition to Hornady bullets, the 4DOF Calculator currently does list seven Berger projectiles, six Sierra projectiles, and one Lapua bullet type. For example, Sierra’s new 183gr 7mm MatchKing is listed, as is Berger’s 105gr 6mm Hybrid.
This Video Explains How to Use Hornady’s New 4DOF Ballistics Calculator
Using the 4DOF™ Ballistic Calculator:
The Hornady 4DOF Ballistic Calculator provides trajectory solutions based on projectile Drag Coefficient (not ballistic coefficients) along with exact physical modeling of the projectile and its mass and aerodynamic properties. Additionally, it calculates the vertical shift a bullet experiences as it encounters a crosswind, i.e. “aerodynamic jump”. The use of drag coefficients, projectile dynamics, aerodynamic jump, and spin drift enable the 4DOF Ballistic Calculator to accurately measure trajectories even at extreme ranges. It is ideal for both long range and moderate distances and is available for the low-drag precision bullets listed in the drop down menu of the calculator. For calculating trajectories of traditional hunting and varmint bullets using BCs (ballistic coefficients), you can use Hornady’s Standard Ballistics Calculator.
To learn more about the properties of dry lubricants for bullets, read our Guide to Coating Bullets. This covers the three most popular bullet coatings: Molybdenum Disulfide (Moly), Tungsten Disulfide (WS2 or ‘Danzac’), and Hexagonal Boron Nitride (HBN). The article discusses the pros and cons of the different bullet coatings and offers step-by-step, illustrated instructions on how to coat your bullets using a tumbler.
This trip to Ottawa for the Canadian National Championship was a specially important one. The U.S. Team tryout process and practice was to take place for two days prior to the National Championship as the next F-Class World Championship is going to be held in Ottawa in August of 2017.
Emil Kovan Competition History:
