Our friend Robert Whitley of ARX Enterprises LLC has learned, through careful measurement and testing, that some barrels threaded 5/8″ x 24 TPI at the muzzle may not deliver optimal accuracy. The reason is that the end of the barrel can bell out slightly, like a trombone, because too much steel has been removed. This is particularly true with .30-caliber barrels, but it can also be a problem with smaller caliber barrels (even 6mm). Robert demonstrates this phenomenon in the video below. All gunsmiths, and anyone considering threading a barrel, should watch the video. At 1:00 – 1:30 Robert gauges a 5/8″ x 24-threaded .30-Caliber barrel. You can see the belling effect clear as day.
“When setting up a commercial barrel in the lathe, we noticed that the maximum-sized bushing that would fit in the bore at the chamber end was almost .0015” smaller [than what would fit] at the muzzle. That precipitated my pin-gauging of a number of different commercial barrels that were threaded for 5/8” x 24 tpi. What I found is what’s shown on the video.” – R. Whitley
Solve Problem with a Larger Thread Diameter
If 5/8″ x 24 threading is potentially harmful to accuracy, is there a solution? Yes, you simply need to leave a little more steel on the barrel. (See Video starting at 02:40.) Frank Green of Bartlein barrels states: “We get these questions all the time. I say run the largest thread diameter that is possible.” Robert Whitley has found that a 3/4″ x 28 TPI threading does not cause the “belling effect”. Accordingly Robert recommends 3/4″ x 28 if you need to thread your barrel for a muzzle brake or suppressor. Robert explains: “We only make 3/4” x 28 TPI muzzle brakes and that’s what we recommend to customers.”
“See how much meatier the 3/4″ threading is vs. the 5/8″. The 3/4″ threading offers a lot more metal around the bore. There’s a lot less opportunity for the bore to become bell-mouthed…” – Robert Whitley
Barrel Threading Diameter — What’s Important to Know
By Robert Whitley
In truth, the 5/8” x 24 TPI threading never came out of any accuracy-based think tank or set-up, it’s a military .30-Cal threading for barrels that someone has to carry around (they needed to keep the barrel weight down so it was smaller in diameter and the threading had to work with that situation). People have somehow assumed because the military uses that threading for certain things that it must mean that it’s also fine for a highly accurate rifle too, but that’s not really correct.
I don’t think there is any better and realistic option than the 3/4″ muzzle threading, and we also do it so there is no relief cut behind the threads on the barrel (i.e. put the relief cut on the brake or jam nut, don’t chop down on the muzzle of the barrel). For some reason many have a hard time grasping that the metal at the muzzle end of a rifle is “sacred” and you should not cut it down any more than absolutely necessary. A little threaded pencil diameter nub on the end of a barrel is not ideal for accuracy especially if it’s threaded and you need to torque on it. I cringe when I see a barrel with something like an MTU or Heavy Varmint contour, only to have an itty-bitty pencil thin threaded nub right at the muzzle so someone can “screw on a can” or a muzzle brake.
Lessons Learned Over the Years
A number of years ago I did a 30BR rifle project with Craig Kostyshyn who was big in the 30BR game and he made some of the best 30BR rifle barrels for benchrest competition. When I did the project I wanted a medium-heavy Palma type contour barrel I could use and also have a muzzle turndown for a front sight band. When he found out I was going to have the muzzle turned down he said “whoa, I need to provide for that when I make the barrel because if you turn the front down later you’ll be shooting a trombone” (i.e. the muzzle bore dimension would open up).
What he did was rough contour the barrel with the turndown (about .010” oversize) before he lapped the barrel, then when he lapped the barrel he took it easy in the muzzle area and worked the back of the barrel more. I thought he was a little bit excessive in his concerns but the barrel shot great and I wasn’t going to argue with him, after all he was shooting groups in the ones. I kind of just filed that away and never thought about it until recently when I went to have Fred from Sabreco do some chamber re-work on a commercial .30-caliber barrel I had. When setting up the barrel in the lathe and indicating things Fred noticed that the maximum-sized bushing that would fit in the bore at the chamber end was almost .0015” smaller [than what would fit] at the muzzle and he mentioned it to me. That precipitated my pin-gauging of a number of different commercial barrels I had that were threaded for 5/8” x 24 TPI. What I found is what’s shown on the video.
NOTE: This is a copyrighted article. Do not reproduce or re-link more than 75 words without written permission from AccurateShooter.com.
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In this interesting video, Brownells Gun Tech Caleb Savant covers the topic of linear compensators, aka “blast diffusers” or “linear blast devices”. These are quite different in function from a typical muzzle brake and they are NOT a sound suppressor. Unlike a traditional muzzle brake, a linear compensator directs the muzzle blast forward, AWAY from the shooter. This is not only good for the shooter but also for folks next to the shooter, either at the range or in a CQB law enforcement or military situation.
A “Linear Compensator”, also known as “blast diffuser”, my look similar to a muzzle brake. But it works differently. A typical muzzle brake shoots blast out the side, and can be pretty annoying for someone positioned next to the shooter. By contract, the Linear Compensator direct blast force more forward. This helps reduce perceived recoil, and importantly doesn’t send hot gasses left and ring to nearby shooters or observes. Muzzle brake output can be very annoying. This Editor once was shooting next to a .338 Lapua Magnum with a brake, just a couple feet away. With each .338 LM shot I could feel heat on arms/hands and actually feel the bones in my forearm vibrate.
Attachment Methods — Direct Thread Mounting vs. Quick-Attach Mounting
Linear compensators have become much more popular in recent years as AR-15 pistols and SBRs have proliferated. Some linear comps, such as popular models from Midwest Industries and the Troy Claymore, attach directly to the muzzle, just like a traditional flash hider or muzzle brake.
Other Linear Compensators are slip-on, quick-attach components that mount OVER another muzzle device. For example, the VG6 Precision CAGE Device (Concussion Altering Gas Expansion) attaches directly over one of their standard muzzle devices. Almost every company that makes a sound suppressor also offers a linear compensator, which typically attaches to the muzzle the same way as the silencer.
Video find by Boyd Allen. We welcome reader submissions.
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A while back, Cal Zant at PrecisionRifleBlog.com did a big muzzle brake comparison test. Along with measuring recoil reduction, Cal’s team recorded sound levels in PRB’s exhaustive muzzle brake field test. In the PRB archives you’ll find comprehensive muzzle brake sound test results, with hard data on 20 different muzzle brakes.
Sound can be a tricky subject, but Cal Zant, the editor of PrecisionRifleBlog.com, presents everything an informed shooter should know about muzzle brake noise in a straightforward and practical way. Most sound tests are measured from the side of the muzzle, in accordance with mil-spec standards, and Cal did that. But he also measured the sound level of each brake from behind the rifle, closer to the shooter’s position. This provides a more accurate indicator of the actual sound levels firearms operators will encounter while shooting.
Muzzle brakes ARE really loud — that’s something most active shooters have observed. But this study finally gives us some hard data and makes objective comparisons. The difference between brakes was quite significant. Some brakes were ear-splitting — more than twice as loud as other brakes tested.
As a bonus, Cal also provides data on how the new Ultra series suppressors from Thunder Beast Arms Corp (TBAC) compare in terms of sound level behind the rifle.
Our friend Ernie Bishop (SEB Rests USA) has been busy in the Wyoming backcountry. Bishop is a big fan of specialty pistols, and one of his favorite XP-100 bolt-action pistols showed its capabilities recently, harvesting a whitetail doe that will provide meat for the Bishop family and friends.
Ernie reports: “Dan Ekstrom and I did some whitetail hunting earlier this week, and tonight our families enjoyed some smoked backstrap and grilled sausage, a bunch of other fixings. We were in the foothills of the Big Horn mountains, outside of Story, Wyoming. Yes, we have whitetail here.”
Ernie’s Remington XP-100 bolt-action pistol features a 14.5″ HS Precision barrel chambered in .308 Winchester, fitted with a Mac’s Gunworks muzzle brake. The scope is a Burris 3-15x50mm XTR2. The field support consists of a BOG Tripod, with the original BOG PSR top and Holland’s small field bag. Ernie reports that, unfortunately, the PSR Top has been discontinued.
The Story of the Successful Whitetail Hunt — Report from the Field Report by Ernie Bishop
My center-grip .308 Winchester XP-100 drew first blood Friday afternoon (12/11/2020). It was a hurried, double-kneeling short shot at around 50-60 yards, using my BOG tripod with PSR top. I was doing the sneaky sneak on my way to place where I was going to sit for the rest of the day (no artificial blind). The doe was either just coming out of cover or was just inside cover. We seemed to discover each other at about the same time. I was in the open though.
Even though I had the XP-100 in one hand and my BOG tripod in the other, I could not get set up quickly enough to make a shot. She turned around and walked back into cover, and then threw up her flag and waved it a few times going away for me and to the left. Now, I need to get about another hundred yards so I can try to get set up on a two-track that’s going to my right and wait there, hoping that she will cross and give me a shot opportunity. As I was walking faster to get to that spot to set up, I look to my right and there she was (or a different one, I’m not quite sure) just inside cover — basically broadside.
Given the spookiness of these deer here this year, I didn’t think I was going to get a shot opportunity. But you don’t know unless you try, so I kneeled, spread the tripod legs and centered up as quick as I could and took the shot. I didn’t range distance before or check afterwards. The whitetail doe dropped on the spot. The 168 grain Hornady A-MAX TAP Precision .308 Win ammo performed admirably.
Ernie’s Tips for Wyoming Whitetail Hunters
There are two different ways that I hunt this area of Wymoming. First is doing the slow sneaky sneak, which has given some good results, but it also ends up with the “just wasn’t able get it done” before they move into cover (which happened more than one time on Thursday and Friday morning). The second way, is to put yourself in a place to where you have a reasonable view, of where you can tell they have crossed, in semi-open areas. I usually am sitting with my back against a tree.
About Ernie Bishop — Specialty Pistol Guru
Ernie tells us: “For those who know of me in the shooting world, you would probably know me in one of two ways — Dealer for SEB Rests or someone who does most of his competing, varminting, and or hunting with specialty pistols. These are typically bolt-action, single-shot rigs that can be used with a bipod. They are similar to a pistol-grip rifle, but without a conventional buttstock. My interest in all things specialty pistols (Remington XP-100, TC Contender, MOA Maximum, Pachmayr Dominator, H-S Precision HSP, etc.) goes back to the early 1980s. Sadly, some of these are no longer made.
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Many hunters and precision rifle competitors use muzzle brakes because these ported devices reduce felt recoil significantly. That make s real difference getting back on target for quick follow-up shots. While many rifle owners appreciate the benefits of muzzle brakes, they may also neglect their brakes, allowing hard carbon and powder residue to build up. Not good. You should regularly clean your muzzle brake to remove fouling and carbon build-up.
As Mark Edgreen posted: “Carbon build up on the crown and in the brake is a recipe for poor accuracy.” And another gunsmith reported that customers complained about guns that “shot out way too early” but they only needed to have the brakes cleaned.
Gunsmith and PRS/NRL competitor Jim See recently reminded his Facebook Fans about the importance of cleaning muzzle brakes: “How many times do I have to say it? You need to maintain your rifles. Clean your muzzle brakes people!”. Jim, who runs Elite Accuracy LLC, notes that hard carbon build-up in brakes can definitely harm accuracy. Look at this example:
Muzzle Brake Cleaning Methods
There are various methods for cleaning a brake, we list a variety of techniques, but we would start with NON-corrosive ultrasound. You’ll want to remove the muzzle device before doing these tasks.
1. Use Ultrasonic Cleaning Machine with cleaning solution. This may be the most efficient method: “I place my brake in the ultrasonic cleaner. Shiney as new.” (Jim Moseley).
2. Spray with commercial Carb Cleaner and brush. Then apply anti-corrosion coating.
3. Soak in half hydrogen peroxide and half vinegar. Suggestion: “Let sit over night and carbon melts off. Brush remaining carbon off, rinse and put the brake back on.” Apply anti-corrosive before mounting.
4. Soak in 50/50 solution of water and white vinegar and brush. (Be sure to apply anti-corrosion coating, such as Eezox, after soaking).
5. Tumble in liquid solution with stainless pins. Comment: “Comes out slightly faded, but perfectly clean on stainless, non-painted brakes though.” Warning — extended tumbling could affect threads of screw-on brakes. Also, tumbling can possibly harm painted or Cerakote finishes.
Gunsmithing Tip: By fitting the muzzle brake so that the barrel crown is slightly forward, it is easier to wipe carbon fouling off the end of the barrel. See photo:
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Current F-TR World Champion Derek Rodgers is also the reigning King of 2 Miles champ, so he knows something about Extreme Long Range (ELR) shooting. While Derek won his KO2M title at Raton shooting the .375 CheyTac cartridge, Derek decided that something even bigger was in order. This season, Derek will be shooting a .416 Barrett. Last week we showcased his impressive .416 Barrett ammo, with massive Cutting Edge bullets.
Now we can show the Big Rig that will deliver those .416-caliber projectiles. This monster weighs 40+ pounds and sports a 40″ Bartlein barrel — more length for more velocity. Derek’s new ELR rifle features a McMillan Beast 2 stock, BAT EX action, and Nightforce ATACR 7-35x56mm scope. Derek explained why he moved up to a bigger caliber: “I built a new rifle with the anticipation of seeing impacts easier. It was not just a larger caliber being more effective on hitting ELR targets, but rather hoping that a missed shot would have a much larger impact. Impacts beyond a mile become harder to see due to terrain and vegetation. So any added dust or splash erupting from the earth is a decisive benefit over an equally-accurate smaller caliber.” Here is Derek’s full report on his new .416 Barrett rifle.
Derek Rodgers Campaigns a .416 Barrett
Report by Derek Rodgers Cartridge Choice — I chose a standard .416 Barrett cartridge as it allows for bullets up to and slightly exceeding 550 grains. It really does bridge the gap between the .375 variants and a 50 BMG. There are several great solid ELR bullet options from manufactures like Cutting Edge that range from 475-550 grains. These offer a variety of extremely high BC options for barrels that have different twist rates. Most loads will utilize the slowest burn rate powders commercially available. Good options are Vihtavuori 20N29, RL50, H50BMG and other powders with a similar burn rate.
Shooting the .416 — Tamer than Expected
An initial observation is that the rifle is very controllable and feels much like a larger F-TR gun. The rifle weighs 40+ pounds, balanced and stays on target very well. The recoil is manageable and linear. This seems to give a straight rearward impulse that does not affect positioning. This allows for quick repositioning into battery and faster follow-up shots.
Rifle Details — BAT EX Action, Bartlein 40″ Barrel, McMillan Beast 2 Stock
Derek’s .416 Barrett ELR Rig features a BAT EX action with a Bix N’ Andy trigger. Out front is a gigantic 40” long, 1:9″-twist Bartlein barrel fitted with a Terminator T5 muzzle brake. The handsome McMillan Beast 2 stock combines a lower center of gravity design with a higher butt location. Given that high butt geometry, McMillan cleverly fitted the higher buttpad with a port allowing the cleaning rod to pass through (see photo below). On top is a Nightforce ATACR 7-35x56mm scope in NF rings on a +60 MOA rail, with Holland 34mm bubble level. The stock is supported by a Phoenix bipod and rests in an Edgewood bag designed for the McMillan Xit F-TR stock.
Note the extended Buttpad height. That helps with recoil in prone position. This McMillan Beast 2 stock includes a pass-through hole for the cleaning rod.
Gunsmithing by Blake Barrel and Rifle in Arizona
Derek’s rifle was built and chambered by Bryan Blake of Blake Barrel and Rifle in Phoenix, Arizona. The chambering was done with a Manson Precision reamer. Derek explains: “Bryan and his family have been in the machine shop business for several generations and have the expertise and equipment to handle larger barrel diameters associated with F-Class to ELR type rigs. I tried to consider all angles and potential pitfalls that might occur during the building process. However, Bryan added his own touches to make the project his own. He truly created a work of art and supplied a turn-key rifle that is meticulously built from the inside out and looks as great as the tolerances it holds.”
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Here is beautiful F-Open rig crafted by Forum member CigarCop of KW Precision LLC. It features a laminated wood stock with stunning figured walnut on the outside.
One of the most popular items in our Shooters’ Forum is the ongoing “Pride and Joy” thread. Since 2009, Forum members have posted photos and descriptions of their most prized rifles. Here are some of the most recent “Pride and Joy” rifles showcased in our Forum. Do you have a gun you’d like to see featured there? Just Register for the Forum and you can add your favorite gun to the list.
New 600/1000 Benchrest Light Gun for Richard Schatz in 6 BRA
This blue benchrest rig was crafted by Alex Wheeler for ace benchrest competitor Richard Schatz, a past 600-yard IBS Shooter of the Year. Richard’s new 600/1000-yard Light Gun features a Krieger barrel chambered in 6 BRA (40° Ackley version of 6mmBR Norma). That Krieger is mated to a 1.550″ BAT B action, ignition-timed for smooth bolt close and increased accuracy. The trigger is the sophisticated Bix’n Andy. Schatz’s BAT is glued and screwed into a Wheeler LRB stock, with aluminum rails and adjustable metal “tracking rudder” on the toe of the stock. The rudder can be adjusted side to side to ensure optimal tracking, while the rudder’s vertical angle can be adjusted slightly with shims.
Hand-Crafted Thumbhole-Stocked Rifle Chambered in 6 PPC
Forum Member Grimstod offered this handsome 6 PPC custom with a beautiful, hand-made thumbhole stock: “This was fully accurized with Premier Accuracy recoil lug installed. Really makes these shoot a lot better. It features a Kelbly Panda action with Hart barrel and glass bedding. Trigger fall was perfect to start and we have to give Ian Kelbly big thumbs up for making every action perfectly timed.” On top is a March competition scope. See more photos at www.premieraccuracy.com.
A Wicked Accurate Big Dawg in 28 Nosler
This 28 Nosler Benchrest rifle looks good and shoots even better — check out that 20-shot target shot at 200 yards! You can’t argue with that…
Belonging to Forum member LA50Shooter, this rig is chambered in 28 Nosler, with metal work by Gre-Tan Rifles. The action is a BAT Model “L” 1.650 Octagon with a 30 MOA scope rail, running a Jewell BR Trigger. The stock, from D&B Supply, is a Shehane Big Dawg Tracker with 5″ fore-end. Color scheme is “Field & Stream” Rutland laminate. This big rig boasts FOUR 34″ Benchmark barrels (1.5″ for seven inches tapering to 1.225″ at muzzle).
A Pair of Score Benchrest Beauties
Forum member JimPag showcased two new Benchrest-for-Score rifles. The rig on the left, smithed by Dwight Scott, features a Farley Black Widow RBLPRE (with Bix’n Andy trigger). It features Pistachio and Carbon Terry Leonard stock glued and screwed by Sid Goodling. The barrel is a Krieger 23.5″ chambered in 30BR with a Mike Ezell tuner. It’s topped with a Goodling-built 1-piece Davidson base and a Nightforce 42X Comp scope. The rifle on the right, smithed by Sid Goodling, features a Marsh Saguaro RBLPRE Action with Bix’n Andy trigger, and March 36-55X scope. This rifle boasts a rare Screwbean Mesquite and carbon stock by Terry Leonard. The 23″ Lilja bbl is chambered in 30 Thrasher with a Goodling tuner. (30 Thrasher is longer 30 BR case developed by Joe Entrekin). Jim also has two other barrels for this action in 30 BR and 6 BRAI. On top is a Sid Goodling-built one-piece Davidson base with a March 36-55X scope.
Rem 700 in Manners Stock — .284 Winchester for Hunting
Here’s a Rem 700 enhanced with a Manners Elite TA stock and other upgrades. Forum Member NickB1075 says: “Here is a rifle I finished for hunting this year. It’s a bit heavy for New York woods carry but it just shoots great. Maybe I will have to get one of those fancy Proof Research barrels to lighten it up a bit.” Nick is running a Benchmark 1:8.5″-twist barrel chambered in .284 Win with 0.315 neck for shooting 150gr Barnes bullets. Nick added a Jewell trigger and on top is a U.S. Optics B10 Scope.
When Only the Biggest and Boldest Will Do — .50 BMG
No “Pride and Joy” feature would be complete without a Big Boomer. This impressive .50 BMG, “61 inches of big bore goodness”, weighs a whopping 49 pounds (95 lbs. complete with case and accessories). This rifle’s proud owner, forum member 6MT, says everything on this black beast is jumbo-sized: “Yes, I can stick my finger clear through the ports in the muzzle brake!” The rifle boasts a U.S. Ordnance 31″ heavy-contour barrel fitted to Barnard GP action. The stock is a “Big Mac” from McMillan. No optics yet — 6MT says he is “looking at an ATACR 7-35x56mm with a Spuhr mount… As soon as my wallet recovers!”
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For a prone shooter, particularly on dusty, dirty or sandy ground, muzzle blast is a major bummer. Muzzle blast can be very disturbing — not just for the trigger-puller but for persons on either side of the gun as well. Some muzzle brakes send a huge shockwave back towards the shooter, and others send blast towards the ground, kicking dirt and debris into the prone shooter’s face. If there was a way to illustrate those factors — shockwave and debris — that might help shooters select one brake design over another.
Cal Zant at PrecisionRifleBlog.com applied a unique blend of creativity and resourcefulness to try to answer that question for 20+ muzzle brakes. Using high-speed photography and household products, he captured the blast pattern of 20+ different brake designs for easy side-by-side comparison. Can you figure out how Cal managed to show muzzle brake blasts so clearly? His “hi-viz” solution, revealed in the article, is very clever. See the eye-opening results for 20+ brakes, with illustrative photos, by visiting the Precision Rifle Blog Muzzle Brake Ground Signature Test Page.
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Muzzle brakes are controversial. Some people swear by them, while others swear at them. Still, there’s no question that a good brake can reduce felt recoil up to 45%. And likewise, the best brakes, when installed properly, seem to have no negative effect on accuracy.
Roy Bertalotto has done considerable experimentation with muzzle brakes, testing dozens of brake designs on his own rifles over the past few years. Roy’s article, Adventures with Muzzle Brakes, discusses various aspects of muzzle brake design and performance. Roy doesn’t claim that his testing is definitive, but his article is definitely worth a read. Here are some of Roy’s interesting findings:
Exit Hole Diameter
“Best accuracy and effectiveness of the brake was obtained with a hole .020″ over bullet diameter. If the exit hole is too small, such as +.005″ over bullet diameter, accuracy suffers. If the depth of the exit hole is too shallow, the metal around the hole will erode very quickly.”
Hole Placement
“The most effective braking was with a brake 1″ in diameter with a 3/4″ exit hole on each side, just in front of the muzzle. The bullet passes through a cone of 35 degrees before it exits the brake. (Like the tank example), Incredible reduction of recoil. But loud and ugly. Very easy to make since you don’t need a spin fixture or a dividing head.”
Bottom Gas Venting Helps Accuracy
“In my tests, not having holes all around the brake effects accuracy a bit. I believe it does something to the bullet by the air pushed ahead of the bullet creating unequal turbulence in the bullet path. I’ve tried a few brakes where I drilled only holes on the top, test fired, and then completed holes on the bottom and in every case, accuracy improved.” Below are spiral-ported brakes crafted by Clay Spencer.
Brakes Work Best with High-Pressure Cartridges
“The higher the pressure of the particular round, the more effective the brake. I have over 20 rifles with brakes. The 220 Swift is the king of reduction. Followed very closely by the 25-06, 6mm Remington, any Weatherby small bore. With a proper brake and a hot handload under a 40 gr bullet, the Swift will move 1/2″ to the rear and 0 muzzle rise! Big boomers with low pressure like 45-70s and shot guns benefit the least.” [Editor’s Note: Roy is judging effectiveness by the percentage of recoil reduction rather than absolute levels of recoil. Obviously if you start with a heavier-recoiling round, the absolute amount of recoil energy reduction is greater. Roy is really talking about efficiency–brakes are most efficient when used with high-pressure cartridges.]
Installation is Key to Accuracy
Roy’s findings are fascinating and suggest that further study of muzzle brakes is warranted. But we can all agree that precision installation of the brake is essential for accuracy. A poorly-installed, mis-aligned brake will degrade accuracy, that is well-known.
Harrell’s Precision has made thousands of muzzle brakes, in many styles and port arrangements. The Harrell brothers offer some good advice for gunsmiths installing brakes: “Muzzle brakes aren’t magic, they reduce recoil by redirecting exiting gas. What’s important is that they are straight and the threads are perpendicular with the base. The only way to get the base and threads perpendicular is to thread, not tap, them on a lathe.”
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The Ruger Precision Rifle (RPR) has been a huge sales success. Nearly a year after its introduction, the RPR remains in very high demand. The first production run by Ruger essentially sold out, so it is very hard to find one for sale, in any caliber.
Though it has a big winner on its hands, Ruger has made some upgrades to its popular RPR. An “enhanced” RPR will be offered with a new handguard, bolt shroud, and muzzle brake. Two new models have been added to the RPR line-up, the model 18004 in .308 Win, and the model 18008 in 6.5 Creedmoor. These models, priced at $1599.00 MSRP, feature a new, low-profile handguard, a new aluminum bolt shroud, and a muzzle brake. The new handguard will work better for scopes with large front objectives. The muzzle brake should reduce felt recoil, but we do wonder whether accuracy might suffer. The brakeless, first-generation RPRs exhibited very good accuracy most of the time.
For the time being, the original model RPRs will be offered along with the new enhanced RPRs: “Both the original and enhanced configurations will be available from Ruger for a time, with the initial pattern being phased out as supplies are depleted.” (Source: American Rifleman). But there is a catch. The new models cost $200.00 more than Gen 1 RPRs. Ruger lists a $1599.00 MSRP for the enhanced RPRs versus $1399.00 for Gen 1 models.
To See NEW FEATURES, click the image below, then SCROLL down the page on the Ruger web page that loads. Yes, the VIDEO is there — you just have to scroll down.
According to American Rifleman, the new handguard has multiple benefits: “Still free-floating and KeyMod-compatible, the new design omits the original’s top-mounted Picatinny rail in order to increase scope clearance. Given the larger objective lenses utilized by long-range optics, this enhancement makes a lot of sense. The bottom surface of the new handguard is also contoured with a flatter surface, providing for a more stable foundation for the mounting of bipods than the original model.” Current RPR owners can purchase the new-style 15″ aluminum handguard for $249.95 from ShopRuger.com.
Ruger RPR Hybrid Muzzle Brake
The original, Gen 1 Ruger Precision Rifle had a threaded muzzle covered by a thread cap. The new “enhanced model” features a factory-installed “hybrid” brake fitted to the barrel. This brake combines radial holes in the rear half with large, angled side ports in the front. Ruger claims the brake reduces recoil almost 40% on a 6.5 Creedmoor. This brake can be purchased separately for $99.95 from ShopRuger.com.
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Tuners work. So do muzzle brakes. But until recently, you had the choice of one or the other. Now with combo tuner/brakes you can tune the harmonics of your rifle barrel while enjoying significantly reduced recoil (and torque). This is a “Win-Win” for shooters of heavy-recoiling rifles.
Rifle accuracy and precision have come a long way in the past 15 years, particularly for long-range applications. The most recent tool to significantly improve precision is the barrel tuning system. The Rifle Accuracy System (RAS) developed by Precision Rifle Systems, incorporates a precision muzzle brake with the tuner. CLICK HERE for Product INFO.
This system potentially offers meaningful group size reduction through control of barrel harmonics. The RAS tuner/brake system was the subject of a June 2012 Precision Shooting (PS) magazine article, titled “Improved Rifle Accuracy” and was also featured in an article in the November 2012 issue of PS titled “Tuning with Confidence”.
READ MORE about RAS Tuner Tests on .260 AI, .223 Rem, and 22LR rimfire rifles.
Copies of both articles and detailed instructions on RAS installation and tuning can be downloaded from www.bostromgunsmithing.com. Eric Bostrom is the distributor for the RAS.
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For a prone shooter, particularly on dusty, dirty or sandy ground, muzzle blast is a major bummer. Muzzle blast can be very disturbing — not just for the trigger-puller but for persons on either side of the gun as well. Some muzzle brakes send a huge shockwave back towards the shooter, and others send blast towards the ground, kicking dirt and debris into the prone shooter’s face. If there was a way to illustrate those factors — shockwave and debris — that might help shooters select one brake design over another.
Cal Zant at PrecisionRifleBlog.com applied a unique blend of creativity and resourcefulness to try to answer that question for 20+ muzzle brakes. Using high-speed photography and household products, he captured the blast pattern of 20+ different brake designs for easy side-by-side comparison. Can you figure out how Cal managed to show muzzle brake blasts so clearly? His “hi-viz” solution, revealed in the article, is very clever. See the eye-opening results for 20+ brakes, with illustrative photos, by visiting the Precision Rifle Blog Muzzle Brake Ground Signature Test Page.
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About Ernie Bishop — Specialty Pistol Guru
Ruger RPR Hybrid Muzzle Brake
Tuners work. So do muzzle brakes. But until recently, you had the choice of one or the other. Now with combo tuner/brakes you can tune the harmonics of your rifle barrel while enjoying significantly reduced recoil (and torque). This is a “Win-Win” for shooters of heavy-recoiling rifles.
