Many of the best videos on reloading products and methods have been produced by Gavin Gear of UltimateReloader.com. Over the last 12 years, Gavin has released 465 videos showcasing reloading products, gunsmithing techniques, and gun testing. Thanks to Gavin’s movie-making skills and hard work, his GavinToobe YouTube Channel recently achieved the 100,000 subscriber milestone. Over the years Gavin’s videos have received over 17.7 million views. Gavin’s videos have benefited shooting enthusiasts and hand-loaders around the globe, and we congratulate Gavin and UltimateReloader.com!
Gavin posted: “Twelve years ago I started my YouTube channel. Shortly thereafter I started publishing ammunition, reloading and shooting sports content. In 2017 I quit Microsoft to work on Ultimate Reloader full time, and on 11/26/2019 I surpassed the 100,000 subscriber mark. WOW, it’s been sooooo much work, but sooooo much fun. Special thanks to my family for putting up with all of the times I’ve worked on this project ‘after hours’. I feel totally blessed. Very much appreciate my community, and also Jonathan Patton for helping me to understand online communities better. I also really appreciate Hornady for their help in getting me started (my first partner). Neil Davies — that’s you. Thanks everyone!”
To mark this major milestone, we’re featuring five of Gavin’s popular videos. The first is his 2019 Black Friday video covering bargains from Midsouth, Starline, KMS Squared, and Inline Fabrication.
Black Friday 2019 Special Bargains
Epic Reloading Hardware Test — 14 Single-Stage Presses
In this remarkable video, Gavin review fourteen (14) single-stage reloading presses. This is the most comprehensive reloading press comparison test ever done by anyone:
Most Popular Video — .223 Rem vs. 5.56×45
This is Gavin’s #1 Video of all time. His .223 Rem vs. 5.56×45 video has been viewed over 1.9 million times. It provides key facts about the similarities (and a few differences) between the .223 Remington cartridge and the 5.56x45mm NATO round.
1000 Yards with .224 Valkyrie
With 50,000+ views, this is one of Gavin’s most popular field shooting videos. Shooting on his scenic “home range” in the Washington mountains, Gavin developed a tack-driving load using Berger 80.5 gr bullets. See 100-yard results and Gavin’s remarkable first-round hit on steel at 1000 yards!
Buck Fever — Right in the Back Yard!
In this video, Gavin uses his new 300 PRC rifle to bag an impressive buck just 100 yards from his shop. For those of you who have hiked miles on a hunt, only to return home empty-handed, this will seem amazing. And yes, Gavin’s 300 PRC cartridge dropped the animal like a stone.
Tomorrow is Black Friday, the biggest SALE DAY of the year. We’ve scoured the internet to find great promotions and discount offers. You’ll find super deals on firearms, reloading tools, optics, shooting accessories, ammo and more. Check out these deals. Many of the offers commenced on Thanksgiving Day. Some of these special offers are for Friday only, November 29, 2019. Other promotions extend all weekend, all the way through Cyber-Monday, December 2, 2019.
Midsouth Shooters — Black Friday Extravaganza
Midsouth Shooters has discounted some of the most popular products for its big Black Friday Extravaganza. There are big savings on RCBS, Lyman, and Hornady reloading hardware. You’ll also find great deals on scopes, ammo, and even the advanced LabRadar chronograph. These deals commence at 6:00 pm on Thursday November 28 (Thanksgiving) at 6:00 pm ET.
Precision Reloading — 10% Off All Products
Precision Reloading is running a compelling Black Friday Promo through Sunday 11/31/2019 at 11:59 PM. Here’s the deal — starting today you can save 10% on ALL orders, including sale/clearance items. That means effectively that everything Precision Reloading sells is 10% off. Yes that includes powder, bullets, dies, reloading tools and more. Get your 10% savings by using CODE “BLACK19″ during check-out.
Whidden Gunworks — Week of Deals
Whidden Gunworks makes outstanding reloading equipment and also does great gunsmithing work. Whidden Gunworks products rarely go on sale, but right now you can save 10% on purchases of $50 or more (CODE WGWBLACK10) or save 15% on $250+ purchases (CODE WGWBLACK15). You can also save $100 on gunsmithing services with the purchase of any Whidden die set — use CODE WGWBLACKRIFLE.
Powder Valley — Free HazMat Starting 11/29/19 — All Brands
Need powder and/or primers? Then head over to Powder Valley. Starting November 29, 2019 (this coming Friday), you can get FREE HazMat for all brands of reloading powders and primers with orders over $179.00. And yes you can combine powder and primers in the same shipment. This great FREE HazMat offer runs through December 2, 2019. Go to PowderValleyInc.com and select FREE HazMat during checkout, starting Friday November 29th.
EuroOptic — 15% OFF Nightforce NXS and SHV Scopes
Nightforce Optics makes great scopes for all disciplines. You’ll see Nightforces on the rifles of top benchrest, F-Class, and PRS/NRL competitors. Right now EuroOptic is running a big Nightforce promo. Save 15% on Nightforce NXS or SHV scopes. No rebate forms needed — the 15% savings is processed when you buy.
AMP Annealing– AMP MK II Annealer $200 OFF Plus Free Pilots
AMP Annealing is running its first-ever sale in the USA, and it’s a good one. Save two hundred bucks! Buy now and get the Mark II annealer for $200 off PLUS three FREE pilots. YOu even get FREE SHIPPING. That’s a combined savings of nearly $300 on what is regarded as the best annealer made.
Grafs.com — Extended Black Friday Sale through 12/31/2019
Grafs.com is running an extended Black Friday sale for an entire month. Starting on Thanksgiving Day (11/27/19), you’ll find dozens of great deals, with the bargains lasting through 12/31/2019. Above are some of the best bargains. CLICK HERE for more great products on sale now through the end of 2019.
21st Century Shooting — 15% OFF Entire Online Order
Whether it’s neck-turning equipment, custom dies, presses, expander mandrels or other reloading gear 21st Century Shooting has top-of-the-line products to offer. Spend at least $50 to enjoy 15% savings on ALL the great 21st Century equipment. Essentially everything in stock is on sale now through Monday 12/2/2019 at 11:59 pm. NOTE: To get the discount enter THANKYOU in the Redeem Coupon Box.
Brownells — Black Friday Sale on Guns, Ammo, Accessories
Brownells is running a HUGE Black Friday Sale with a vast collection of items deeply discounted. You’ll find big savings on AR receivers, AR parts, Federal ammo, Howa barreled actions, gunsights, triggers, magazines and more. There’s really something for everyone. Plus get free ground shipping on Ammo if you sign up for Brownells Edge program.
LongShot Cameras (TargetVision) — CyberSale Save Up to $100
Longshot (TargetVision) is running a big CyberSale right now. Right now you can save on ALL LongShot Camera products. The superb LongShot LR-3 2-mile UHD (Ultra-High-Definition) is now just $699.00 on sale, while the 300-yard UHD Marksman is on sale for $349.00. The new Hawk Spotting Scope camera is a steal at $249.00, marked down from $299.00. Act soon — these deals expire 12/2/2019.
Palmetto Armory — Major Black Friday Sale on Guns and Ammo
Palmetto State Armory (PSA) has some amazing deals right now on rifles, pistols, gun parts, and ammunition. You’ll find AR uppers, lowers, build kits, parts, ammunition, and more at the lowest prices of the year. Palmetto is one of the leaders in AR builds so if you’ve been holding out to get your hands on a nice AR now is your chance to get one. Right now a PSA complete AR lower is just $129.00!
MidwayUSA — Huge Black Friday Sale and Free Shipping $49+
If you’re shopping for optics, tools, reloading gear and more, check out MidwayUSA’s Black Friday Sale. Select products from top brands such as Vortex, Leupold, Remington, and Hornady are on sale for up to 50% off. You can also get FREE Shipping on all orders over $49 with CODE GREATDEAL49.
AREA 419 — Black Nitride Friday Sale
Area 419 makes some of the finest aftermarket accessories on the market. Right now Area 419 is running a Black Nitride Friday Sale with a selection of black nitrided products. These include muzzle brakes, suppressor mounts, thread caps, and Defiance nitrided actions. You can even order a complete custom rifle with Defiance action and other black components. Prices are very attractive.
PMA Tool — 10% Off Orders Over $150
PMA Tool carries a wide variety of very high-quality products for precision shooters — Lenzi rear bags, micro click-adjusters for dies, cleaning cradles, neck-turners, action wrenches, just to name a few. Right now, during PMA’s Black Friday Sale, you can save on PMA’s full selection of items. Get Free Shipping with a $100 order, or save 10% with orders over $150.00. These promos apply through 1/2/2020.
Bullet Central — Secret Reward Code Giveaway
This year, Bullet Central has a secret reward program. If you place an order during this Black Friday/Cyber Monday weekend you have a chance to win one of 250 Secret Reward Codes. Each Reward Code is worth at least 5% off a Bix’n Andy TacSport trigger, and the Code MIGHT be worth much more. There will also be at least Reward Code good for a FREE Bix’n Andy TacSport trigger.
Ever wondered what caused a particular bulge or marking on a case? And more importantly, does the issue make the case unsafe for further use? Sierra Bullets Ballistic Technician Duane Siercks offers some insight into various issues and their causes in two Case Diagnostic articles from the Sierra Blog.
Incipient Case-Head Separation
This is a Winchester .308 Win case that has a real issue. This case has a very obvious incipient case head separation in the process of becoming a complete failure.
This is most commonly caused by over-sizing the case causing there to be excess headspace on the case. After a few firings and subsequent re-sizing, this case is just about ready to come completely apart. Proper die adjustment is certainly a requirement here. Of course this case is not safe to reuse.
Excessive Pressure (Load Too Hot)
If you will notice in the picture of the case rim, there are two pressure signs to notice. First, look at the primer. It is basically flattened to about the max of what could be considered safe. If this was the only pressure sign noted, I would probably be fine with this load, but would constantly keep an eye on it especially if I was going to use this load in warmer temperatures. This load could easily cross into the “excess pressure” realm very quickly.
There is another sign of pressure that we cannot ignore. If you’ll notice, there is an ejector mark apparent that is located over the “R” of the R-P headstamp. This absolutely tells us that this load would not have been in the safe pressure range. If there were any of these rounds loaded, they should not be fired and should be dis-assembled. This case should not be reloaded.
Split Case-Neck
Here we have an R-P .22-250 case that has died the death. Everything looks fine with this case except the neck is split. This case must be tossed.
A split neck is a normal occurrence that you must watch for. It is caused by work-hardening of the brass. Brass cases get harder with age and use. Brand new cases that are stored for a period of time can become hard enough that they will split like this case within one to two firings. I have had new factory loads do the same thing. Then as we resize and fire these cases repeatedly, they tend to get harder and harder. Eventually they will split. The life of the case can be extended by careful annealing practices. This is an issue that would need to be addressed in an article by itself. Of course this case is no longer usable.
In the classes that I teach, I try to use examples like this to let the students see what they should be looking for. As always, if we can assist you, whether you are new to reloading or very experienced, contact us here at Sierra Bullets by phone at 1-800-223-8799 or by email at sierra@sierrabullets.com.
Dented Case Body
Here we have a Lake City 7.62×51 (.308 Win.) case with two heavy marks/dents in the case body.
This one may be a bit of a mystery. It appears as if this case may have been caught in the action of a semi-auto rifle when the firearm jammed or the case failed to clear during the cycling process. I probably would not reload this case just to prevent any feeding problems. This also appeared to be a factory loaded round and I don’t really see any pressure issues or damage to the case.
Multiple Problems — Lake City 5.56×45 unknown year.
This case has suffered multiple failures and cannot be re-used. First its has have a very rounded shoulder that is split. Upon first look it was obvious that this round had been a victim of excess pressure. The firearm (perhaps an AR?) was apparently not in full battery, or there was possibly a headspace issue also. While taking a closer look, the primer was very flat and the outside radius of the primer cup had been lost. High pressure! Then I also noticed that there was an ejector mark on the case rim. This is most certainly an incident of excessive pressure. This case is ruined and should be discarded.
It is very important to observe and inspect your cases before each reloading. After awhile it becomes second nature to notice the little things. Never get complacent as you become more familiar with the reloading process. If ever in doubt, call Sierra’s Techs at 1-800-223-8799.
Readers — if you reload with Accurate-brand 2495, 4064, or 4350 powders, check your containers now! Accurate Powder is recalling certain lots of these powders in both 1-lb and 8-lb containers. This is serious. The manufacturer says: “The use or storage of this product may result in combustion, fire damage, and/or possible serious injury or property damage.” The problematic powders being recalled were manufactured for Western Powders Inc. prior to 10/1/2016, but they may have been sold anytime after that.
Check the Lot Number on the back or bottom of the containers. The lot number is the last digit or last two digits (right-most digits). Here are the recalled lots:
Accurate 2495 Lots 2-17 | Accurate 4064 Lots 2-16 | Accurate 4350 Lots 2-22
If you have any of the affected powder you should fill the container immediately with WATER. Then contact Western Powders at 406-234-0422 or customerservice@westernpowders.com .
Accurate Powders Recall Notice for 2495, 4064, 4360 Powders
Recall tip from EdLongrange. We welcome reader submissions.
Would you like to swap dies in and out of a reloading press in just seconds, with a quick twist of the wrist? Hornady’s Lock ‘N Load twist-lock hardware makes that possible. This time-saving system uses “die bushings” that screw on to your dies. Don’t have Hornady press? No problem — the Lock-N-Load system can be used with non-Hornady presses via the Lock-N-Load Conversion Kit. This includes three die bushings and one press conversion insert. The adapter will work with RCBS RockChuckers and any other reloading press using a 1-1/4-12 thread. The Lock-N-Load Conversion Kit costs just $15.59 at Midsouth Shooters Supply. Watch this video to see how it works.
Product and video tip from EdLongRange. We welcome reader submissions.
RCBS has come out with a new, twin-tube powder scale/dispenser that promises to deliver 1- or 2-kernel precision in the slower, more precise “Match Mode”. If it really works, this new RCBS MatchMaster unit could compete with an Auto-Trickler V3 mated to a Magnetic Force Restoration scale. However, the new MatchMaster employs a strain-gauge scale, so it will be interesting to see how the unit actually performs.
This is an impressive new machine, but it represents a signficant investment. MSRP for the MatchMaster is $1123.95 with street price around $899.00 (MidwayUSA). At around $900.00, the MatchMaster competes with an AutoTrickler system, which is definitely fast and highly precise.
Ultimate Reloader Tests the New RCBS MatchMaster
Our friend Gavin Gear of UltimateReloader.com got his hands on one of the first production MatchMasters. Gavin put the machine through its paces in a “first look” video using two powders, Bullseye and Varget. In the video, Gavin explains the machine’s design features. Then he tests the new MatchMaster in both Standard Mode (faster) and the slower, more precise “Match Mode”. Gavin also published a full-length MatchMaster Review with detailed test results.
RCBS claims that the MatchMaster can dispense charges to within ± 0.04 (four hundreths) grain in Match Mode. That’s 1-2 kernels of an extruded powder such as H4350. Gavin’s testing, using an A&D FX-120i Magnetic Force Restoration scale as a control, showed that RCBS’s claims are solid.
“You can actually fine-tune the settings for the large dispensing tube and the small tube. There are quite a few parameters… quite a bit of flexibility.” — Gavin Gear.
RCBS MatchMaster Features
— MatchMaster offers two modes, Standard (Faster) and Match (More Precise)
— MatchMaster has two powder dispensing tubes, a larger diameter for large flow and a second smaller tube for precise trickle.
— MatchMaster Settings can be controlled with RCBS Mobile App that works through BlueTooth.
— Powder is removed from the BOTTOM of the machine. This means you must lift the unit up off the bench, then plug a drain tube into the bottom of the unit. See photo.
How Accurate Is the MatchMaster?
Near the end of his video review, Gavin threw an 84.20 grain charge of Varget with the MatchMaster. He then weighed the same charge with his A&D FX-120i Magnetic Force Restoration scale. The charge weights agreed exactly at 84.20 grains. When the same pan was placed a second time, the FX-120i showed 84.16 grains. That’s still a mere 0.04 grain variance, which is RCBS’s stated precision claim for Match Mode.
Note: This shows first placement of pan on the A&D FX-120i. A second placement of pan on FX-120i stabilized at 84.16 grains.
How Fast is MatchMaster in Each Dispensing Mode?
Gavin started testing the MatchMaster in Match Mode with Bullseye, a popular flake pistol powder. With a 24.00 grain Bullseye charge, one dispensing took 26 seconds (11:40 time-mark), while another took 40 seconds (12:30 time-mark), an average of 33 seconds. In standard mode, the MatchMaster dispensed 24.0 grains of Bullseye in 18.5 seconds average (15.03 time-mark, 15:32 time mark). So Standard Mode was 44% faster with Bullseye.
Next Gavin filled the machine with Hodgdon Varget powder and dispensed a 25.0 grain charge in Standard (Fast) Mode. The first try took 12 seconds (18:30 time mark) to dispense the charge, while the second run of 25.0 grains took just 11 seconds (18:50 time mark).
“Hodgdon Varget performed VERY well with the MatchMaster powder dispenser. I would call this powder the ‘Speed King’ here — it dispensed way faster than the Alliant Bullseye with the settings I used, and I only had one overage which was corrected when I changed powder settings. Bravo!” — Gavin Gear
Then Gavin switched to Match (Precise) Mode and dispensed two more 50.00 grain charges of Varget. These two precision throws finished in 20 seconds (20:38 time mark) and 17 seconds (21:09 time mark) respectively, for an 18.5 second average. That’s very good for large 50.00 grain charges, although the first charge was actually 50.06 grains, about two kernels high. But Gavin explained that the machine permits fine-tuning of the powder type setting. He changed this to account for larger extruded kernels and got a perfect 50.00 grain throw in 35 seconds (22:01 time mark). The “customized” powder settings can be loaded into the RCBS MatchMaster App for future use (See below):
Conclusion — Initial Tests Show Good Performance
Based on Gavin’s testing, the MatchMaster delivers on its promises. With Varget extruded powder, it was quite fast, even in “Match Mode”. The dispensed charges were exact within .04 (four hundredths) of a grain, i.e. a couple of kernels, as confirmed by the A&D FX-120i Force Restoration Scale. Gavin actually liked the system of removing the powder through the bottom of the machine, using the supplied tube. It takes some practice, but it worked fine, as you can see in the video.
The RCBS MatchMaster employs a strain-gauge scale. It remains to be seen if there is a bit of drift, as you will observe with strain-gauge dispensers in the $200-$300 range, such as the original RCBS ChargeMaster. During his MatchMaster test session, Gavin said he did not observe any drift, a good sign. Overall, it looks like this is an impressive machine. But, with a $899.00 price, this is a serious investment. Anyone considering the new MatchMaster will also want to look at the AutoTrickler V3 system with AutoThrow. It costs $520.00, NOT including a lab-grade Magnetic Force Restoration balance ($600 to $1000+).
We’re approaching winter — the perfect time to stock up on your propellants for next season. And now you can earn up to $5.00 per pound on your favorite Vihtavuori powders. Vihtavuori makes some great powders that have been used to set many records. With Vihtavuori’s Keep Your Cash Rebate, you can get up to $100 cash back on qualifying Vihtavuori powder purchases.
Vihtavuori $100 CONSUMER REBATE
This offer is valid on qualifying purchases made between November 1, 2019 and January 1, 2020. This applies to all sizes, 1-lb, 4-lb, and 8-lb. You can also mix and match powders to maximize your rebate. Pick up a Rebate Form from your favorite Vihtavuori retailer or download the PDF Form linked below. Then submit the form with your proof of purchase no later than January 31, 2020.
The 2019 Vihtavuori Rebate program is currently under way. For a limited time, earn $5.00 back per one-pound bottle, $10.00 per four-pound bottle, and $20.00 back per eight-pound bottle when you purchase Vihtavuori powders (maximum $100 rebate). Offer is valid on qualifying purchases made between November 1, 2019 and January 1, 2020. All rebate coupons must be received by January 31, 2020.
Noted gun writer Glen Zediker (author of Top Grade Ammo), regularly contributes tech articles to the Midsouth Shooters Blog. One of Glen’s Midsouth Blog articles covers Bullet Design. We suggest you read the article — even seasoned hand-loaders will learn a few things about projectile properties (and how to choose the right bullet design for your needs). Glen also wrote a recent Blog article on cartridge pressure signs, linked below
Glen explains: “A ‘match’ bullet’s job is to perforate a piece of paper. A bullet designed for varmint hunting, on the other hand, is designed to produce explosive impact, and one for larger game hunting strives to strike a balance between expansion and penetration. However! No matter how it’s built inside, there are universal elements of any bullet design, and those are found on the outside.”
In his article, Glen identifies the key elements of a bullet and explains how they are defined: “Base, that’s the bottom; boat-tail, or not (flat-base); shank, portion of full-caliber diameter; ogive, the sloping ‘nosecone'; tip, either open or closed (open it’s called the ‘meplat’). The shape of the ogive and the first point of ‘major diameter’ are extremely influential elements. The first point of major diameter can vary from barrel brand to barrel brand because it’s the point on the bullet that coincides with land diameter in the barrel — the first point that will actually contact the barrel as the bullet moves forward. When there’s a cartridge sitting in the rifle chamber, the distance or gap between the first point of major diameter and the lands is called ‘jump’, and, usually, the less there is the better.”
Ogives Analyzed — Tangent vs. Secant Bullet Designs
Glen notes that bullet designs reflect secant or tangent profiles, or a combination of both: “The two essential profiles a bullet can take are ‘secant’ and ‘tangent’. This refers to the shape of the ogive. A tangent is a more rounded, gradual flow toward the tip, while a secant is a more radical step-in, more like a spike. Secants fly with less resistance (less aerodynamic drag), but tangents are [often] more tolerant of jump [or to put it another way, less sensitive to seating depth variations].”
Glen adds: “Ogives are measured in ‘calibers’. That’s pretty simple: an 8-caliber ogive describes an arc that’s 8 times caliber diameter; a 12-caliber is based on a circle that’s 12 times the caliber. The 8 will be a smaller circle than the 12, so, an 8-caliber ogive is more ‘blunt’ or rounded. Bullets with lower-caliber ogives are more tolerant of jump and (usually) shoot better, easier. Higher-caliber ogives [generally] fly better, farther. This is an important component in the ‘high-BC’ designs.”
Learn More in Zediker Books
Glen has authored a number of excellent books for hand-loaders and competitive shooters. Here are three of his most popular titles, including his latest book, Top Grade Ammo:
All these titles are available from Midsouth Shooters Supply. Click each cover above to purchase from Midsouth.
Most of us own a .223 Rem rifle. Now, thanks to our friends at Rifleshooter.com we can assess exactly how velocity changes with barrel length for this popular cartridge.
Rifleshooter.com performed an interesting test, cutting the barrel of a .223 Rem rifle from 26″ all the way down to 16.5″. The cuts were made in one-inch intervals with a rotary saw. At each cut length, velocity was measured with a Magnetospeed chronograph. To make the test even more interesting, four different types of .223 Rem/5.56 ammo were chron’d at each barrel length. The Rifleshooter.com team that conducts these tests has a full-service gun shop, 782 Custom Gunworks — visit 782guns.com.
Test Barrel Lost 25.34 FPS Per Inch (.223 Rem Chambering)
How much velocity do you think was lost, on average, for each 1″ reduction in barrel length? The answer may surprise you. The average speed loss of the four types of .223/5.56 ammo, with a 9.5″ shortening of barrel length, was 240.75 fps total (from start to finish). That works out to an average loss of 25.34 fps per inch.
5.56/.223 Barrel Cut-Down Speed Test 26″ to 16.5″
Start FPS at 26″
End FPS at 16.5″
Total Loss
Average Loss Per Inch
UMC .223 55gr
3182*
2968
214
22.5 FPS
Federal M193 55gr
3431
3187
244
25.7 FPS
Win m855 62gr
3280
2992
288
30.3 FPS
Blk Hills .223 68gr
2849
2632
217
22.8 FPS
*There may have been an error. The 25″ velocity was higher at 3221 fps.
Rifleshooter.com observed: “Cutting the barrel from 26″ to 16.5″ resulted in a velocity reduction of 214 ft/sec with the UMC 223 55-grain cartridge, 244 ft/sec with the Federal M-193 cartridge, 288 ft/sec with the Winchester M855 cartridge and 217 ft/sec with the Back Hills 223 68-grain match cartridge.”
How the Test Was Done
The testers described their procedure as follows: “Ballistic data was gathered using a Magnetospeed barrel-mounted ballistic chronograph. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. Average velocity and standard deviation were logged for each round. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. The barrel was cut off using a cold saw. The test protocol was repeated for the next length. Temperature was 45.7° F.”
See More Barrel Cut-Down Tests on Rifleshooter.com
Rifleshooter.com has performed barrel cut-down tests for many other calibers/chamberings including 6mm Creedmoor, .308 Winchester, and .338 Lapua Magnum. See these test results at Rifleshooter.com.
Much Different Results with 6mmBR and a Longer Barrel
The results from Rifleshooter.com’s .223/5.56 test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. When we cut our 6mmBR barrel down from 33″ to 28″ we only lost about 8 FPS per inch. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was longer than Rifleshooter.com’s .223 Rem start length. Velocity loss may be more extreme with shorter barrel lengths. And, of course, different cartridge types and powder/bullet combinations will yield different results.
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.
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.
