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September 25th, 2014

Intro to Suppressors — How Silencers Work

“How do silencers work?” We hear that question often. Now, thanks to Silencerco.com, we can answer that question. Here’s a helpful infographic that illustrates the features of a suppressor (aka “silencer”, “can”, or “sound moderator”). Silencers reduce gunshot noise by providing a contained space where hot gases can dissipate and cool before exiting. Silencers are typically divided into multiple, internal expansion chambers. A quality suppressor can reduce gunshot noise by 30 decibels (db) or more. See the chart for comparative firearm noise levels (suppressed vs. un-suppressed).

In the United States, suppressors have become much more popular in recent years. In fact, the number of licensed silencers has doubled since 2011. Over 571,750 suppressors are now lawfully registered in the USA. Firearm sound moderators can now be purchased legally in 39 states, provided one obtains the requisite Federal tax stamp. (Texas is the leading suppressor state.) Seven European countries also allow suppressor ownership.

CLICK IMAGE to Load Larger Version.
silencerco.com silencer suppressor moderator ATF moderator

Silencer suppressor modern shooterSuppressors Featured in Modern Shooter
Legal for private ownership in 39 states, suppressors are more popular than ever (though many gun owners are still not aware that silencers can be acquired without much difficulty). The Fall 2014 issue of Modern Shooter focuses on the popularity of today’s suppressors and sound-moderating technology available for handguns, rifles, and shotguns. This entire issue is dedicated to suppressors and their benefits. This comprehensive guide explains how suppressors work and how gun owners can easily (and lawfully) purchase them. The issue includes a detailed history of the suppressor, which was first patented in 1909 by the son of the inventor of the machine gun. There is also a feature story on hunting with suppressors in Europe. Modern Shooter is available on newsstands and as a digital download at GunDigestStore.com.

Permalink Gunsmithing 2 Comments »
September 24th, 2014

Eye Protection — LuckyGunner Labs Field Tests

If you’re one of those folks who doesn’t wear eye protection, you need to check out the LuckyGunner Labs Eye Protection Test. For those who DO wear safety glasses — don’t assume that everything is OK. Just because you purchased name-brand “safety glasses” doesn’t mean that you are getting truly effective protection. In fact, many forms of protective eyewear sold today are flimsy, or poorly made. Consequently, they won’t stop even low-energy, slow-velocity fragments.

CLICK HERE to Read Complete Eyewear Test Report by LuckyGunner Labs.

Lucky gunner eyewear testTwo years ago, LuckyGunner Labs conducted very extensive field tests of 28 types of eyewear, ranging in price from $7 to $220. Remarkably, some of the most expensive safety eyewear performed no better than $10 items. Many of the products failed shockingly — with the lenses coming right out of the frames when hit with pellets. LuckyGunner recorded these kind of failures even with ANSI Z87-“approved” eyewear. The reason is that the Z87 test is not tough enough: “The basic ANSI standard is referred to as Z87, and you’ll see this marked in a number of locations on most eye protection marketed to shooters. However, the Z87 impact standard involves a .25″ steel ball traveling at 150 fps — this is fine for protecting eyes from debris that might fall or be thrown, but is not extremely relevant to shooters, who are dealing with objects traveling at much higher velocities.”

Standard Impact speed Caliber/Size
ANSI Z87.1-2003
High Velocity
150 feet/second
45 meters/second
0.25″ diameter steel ball
(25 caliber)
Mil-PRF-31013
Vo ballistic test
640-660 feet/second
195 meters/second
0.15 inch diameter steel projectile (15 caliber)

The testers recommend you select eyewear that meets military specification (above and beyond ANSI Z87). The MIL-PRF-31013 Standard covers projectiles up to 650 feet per second. This is much more stringent. Additionally, you want to replace often-used protective eyewear every year or so. Long-term exposure to UV radiation can weaken polycarbonate and lessen its ability to withstand impacts.

SUMMARY — What to Look for in Protective Eyewear

THE GOOD — Eyewear Protects Against Direct Hit with .22 Short Bullet
APEL Revision Sawfly eyewear was shot with a .22 Short, pushing a 29 grain bullet at 710 fps. That’s not powerful by modern firearm standards, but this might be fairly representative of a ricochet bullet fragment. The Sawfly lens stopped this 29gr bullet with minimal damage to the cheek area.

Lucky gunner eyewear test
THE BAD — Remington Eyewear Lenses Separate. Right Lens Enters Eye Socket
The most gruesome example was the cheap Remington eyewear which shed both lenses back towards the eyes, one of which embedded itself into the eye socket. The real-world implications of this action are disturbing to say the least.

Lucky gunner eyewear test

THE UGLY — Prescription Glasses Failed Miserably
Many ranges don’t see any need for protective eyewear beyond prescription glasses. However, most prescription lenses offer little if any protection. If the prescription lenses are glass, this can create more problems. As shown below, these prescription glasses offered no ballistic protection, and, in fact, proved more dangerous to the eyes due to the flying glass shards.

Lucky gunner eyewear test

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Results Chart, Video Clips, and Photos copyright Luckygunner.com.

Summary and Conclusions:
For faster-moving projectiles such as ricochet fragments, you need high quality, tested eye protection. LuckyGunner recommends eyewear with a single (one-piece) lens for any activity where your face might be struck by small, fast-moving objects. Individual lenses detach from the frames once a certain level of force is reached, and they are driven back into the eye sockets, where considerable damage may be done. There are good examples of protective eyewear with two separate lenses, but a broad, one-piece lens distributes force much better.

Lucky gunner eyewear testA wide, comfortable, and preferably soft rubber nosepiece is critical. Along with good “arms”, this will serve to keep the eye protection in place and will also reduce the chances of the lens being driven down or back into the face with enough force to damage the orbital bones.

A frame that connects across the top of the lens, not individual arms which attach to the outside corners of the lens, is recommended. This will reduce the chances of the lens detaching from the frame under impact (it’s still possible, just less likely). Some types of eye protection actually use the frame to absorb impact and distribute force.

NOTE: Andrew, the author of the LuckyGunner Eyewear report, was a former Navy Corpsman. Accordingly, he is familiar with health and safety matters.

Permalink - Videos, Tech Tip 3 Comments »
September 24th, 2014

How America Became a “Shall Issue” Nation

Concealed Carry Legislation Right to Carry handgun weaponOver the past three decades, a quiet revolution has been taking place across the country. We’re talking about the expansion of “right-to-carry” or “shall issue” laws allowing citizens to carry concealed firearms. If you look at the animated map below, you’ll see that the vast majority of states now allow citizens to obtain carry permits on a “shall-issue” basis. That typically means than a citizen can obtain a carry permit after fulfilling basic requirements, such as a background check, safety class, and finger-printing.

As recently as the mid-1990s, most states disallowed carry permits, or allowed such permits only at the discretion of local law enforcement officials. Over the past 30 years states have migrated to less restrictive alternatives. The map below shows how most states have gone from “No-Issue” (Red) or “May-Issue” (Yellow) status to “Shall Issue” (Blue).

Concealed Carry Legislation Right to Carry handgun weapon

Opponents of right-to-carry legislation argued that the passage of “shall issue” laws would increase gun violence. In fact, the opposite occurred. The level of violent gun crime has declined in recent decades. A study by the Bureau of Justice Statistics (BJS) showed a 39% decline in gun murders from 1993 to 2011 plus a 69% drop in non-fatal gun crimes during that period.

All 50 states have now passed laws allowing citizens to carry certain concealed firearms in public, either without a permit or after obtaining a “shall-issue” or “may-issue” permit from local law enforcement. Illinois had been the last state without such a provision — but its long-standing ban on concealed weapons was overturned in a federal appeals court, on Constitutional grounds. Illinois was required by the court to draft a concealed carry law by July 9, 2013 at which time the Illinois legislature, over-riding the amendatory veto of the governor who had sought to impose many restrictions, approved concealed carry to begin January 2014, at the latest.

Permalink News 2 Comments »
September 24th, 2014

Target Shooting Participation Rises 19% in Recent Years

The shooting sports are thriving in the USA. Target shooting participation levels have increased 19% over a recent 4-year period, from 34.4 million shooters in 2009 to 40.8 million in 2012. That means 6.4 million more Americans are shooting. By contrast, golf and some other hobby activities have seen their participant base decline by millions. Despite pressures to close shooting ranges and the high cost of ammunition and reloading components, more people than ever before are enjoying target shooting. The increase in target shooting has been driven by an influx of new shooters.

Demographic Changes in Ranks of Target Shooters
Compared to those who took up shooting 20 or 30 years ago, these new shooters represent a generational change. Newcomers — defined as those who have taken up target shooting in the last five years — are trending younger and female. Also, more new shooters are city and suburban dwellers (compared to older shooters who typically live in rural areas). In these ways, the demographic profile of new shooters is different than that of established participants.

nssf profile target shooting

Although they may be different in age, gender, and geo-location, newcomers share one important thing with established participants — their passion for firearms ownership and the shooting sports. The traditional pastimes of handgun, rifle and shotgun target shooting continue to have a broad appeal to new generations of Americans.

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September 23rd, 2014

IBS 600-Yard Benchrest Nationals in Memphis September 26-27

IBS 600 yard nationals memphis tennessee tn

The 2014 IBS 600-Yard Benchrest Nationals will take place this upcoming weekend in Memphis, Tennessee at the Memphis Sport Shooting Assn. (MSSA) Range. The match runs Friday, September 26th through Saturday, September 27th. Set-up and practice sessions will be held on Wednesday and Thursday. The for-record matches will commence with the Light Gun division at 8:05 am on Friday. Heavy Gun matches will be held on Saturday.

IMPORTANT — You can still join in the fun. It’s not too late to register for this event. You can register at the range up to 6:00 pm on Thursday, September 25th. Mike Moses is the Match director. The MSSA Range is located about 25 miles northeast of Memphis, TN. Click here for directions and hotel links.

IBS 600 yard nationalsIBS 600-YARD NATIONALS – 2014
Memphis Sport Shooting Association
9428 Old Brownsville Road
Lakeland, TN 38002

Light Gun Competition – Friday, Sept. 26th.
Sign in by 7:30 A.M. Firing will begin 8:05 A.M.
Relays will fire in sequential order #1, #2, #3 & #4.

Heavy Gun Competition – Saturday, Sept. 27th.
Sign in by 7:30 A.M. Firing will begin 8:05 A.M.
Relays will fire in the order of #3, #4, #1 & #2.

Practice and Set-Up Sessions:
Wednesday Sept. 24th – 12:00 Noon until 6:00 pm
Thursday, Sept. 25th – 8:05 am until 6:00 pm

Registration and Fees
The current Match Registration fee is $200. (This includes lunch for both days). Registration deadline is 6:00 pm, Thursday, September 25th.

If you will register on site, fees may be paid to Mike Moses (Match Director). The organizers say: “If a competitor is delayed en route and is not pre-registered, please let us know as early as possible! We’ll make every effort to allow a late entry.”

Mike Moses, Match Director
Phone: 901-493-1687
Email: ashlinmetalworks [at] bellsouth.net
4224 Coleman Rd.
Memphis, TN 38128

10-year-old Rory Jacobs competed at last year’s IBS 600-yard Nationals in St. Louis, Missouri.
600 yard nationals IBS

Event tip by Samuel Hall. We welcome reader submissions.
Permalink Competition, News No Comments »
September 23rd, 2014

September 27th is National Hunting and Fishing Day

National Hunting Fishing DayNational Hunting and Fishing Day (NHF Day) takes place on Saturday, September 27, 2014. The annual celebration serves as a reminder that conservation succeeds because of leadership and funding from hunters, shooters and anglers. National, regional, state and local organizations will run thousands of “open house” hunting- and fishing-related events around the country. Events will include Fishing Derbys, Hunting Expos, Wing-shooting tournaments, and much more. Over four million Americans will participate. For information on NHF Day, visit www.nhfday.org. To find NHF Day events, click the link below.

National Hunting and Fishing Day Events (Listed by State)

Permalink Hunting/Varminting No Comments »
September 23rd, 2014

Track Ammo Prices and Availability with WikiArms.com

Wikiarms live ammo trackingIf you’re looking for loaded ammunition at affordable prices, WikiArms.com can help you find a good deal. WikiArms constantly searches the listings of ammo vendors across the web. Then WikiArms ranks the offerings by cost per round, low to high. This way you can instantly compare prices from multiple vendors including Ammoland, Brownells, Cabelas, Lucky Gunner, MidwayUSA, Natchez, Sinclair Int’l, Slickguns, Sportsmans Guide, and Wideners. Search bots refresh pricing constantly so listed prices are normally current within five minutes. WikiArms even displays the amount of product currently in stock for each vendor.

Wikiarms live ammo tracking

Using WikiArms is easy. Just click your choice of caliber (such as 9mm, .22LR, or .308 Win) on the navigation bar, or hit the Good Deals link to see a variety of cartridge types all at one time. WikiArms is fast, and it is FREE to use. Check it out.

Permalink Bullets, Brass, Ammo, News No Comments »
September 22nd, 2014

Practical Thoughts About Transonic Bullet Stability and Accuracy

One of our Forum Members has a .308 Win load that dips into the transonic speed range at 1000 yards. He is concerned that his bullets may lose accuracy as they slow to transonic speeds: “My target is at 1000 yards. How important to accuracy is it to keep the bullet supersonic (Mach 1.2) all the way to the target? How does slowing to transonic speeds in the last 100 yards or so affect accuracy?”

TargetShooter Magazine and AccurateShooter.com contributor Laurie Holland offers some practical answers to this important question, based on his his experience with .223 and .308-caliber bullets.

Thoughts on Accuracy and Transonic Bullet Speeds by Laurie Davidson.
There is no simple answer to the question “How do transonic speeds affect accuracy”. Some bullets manage OK, some not so well, some fail entirely, and I’ve never seen a guide as to which models do and which don’t. But we do have the ‘boat-tail angle rule’, anyway. Bryan Litz says the ideal boat-tail angle is 7-9°. Go much above 10° and it’s too steep for the air to follow the bullet sides around to the base. This seems to manifest itself as much increased drag and turbulence leading to instability in transonic flight.

It is this effect that has led to the common advice of “Don’t use 168gr 30-caliber bullets at 1000 yards”. That is misleading advice as it resulted from use of the 168gr Sierra ‘International’ (aka MatchKing) bullet with its 13-deg BT angle. (This was, originally, a specialized 300m design — there are various near copies on the market from Speer, Hornady and Nosler.) By contrast, Berger 168-grainers are designed as long-range bullets with 8.9, 8.5 and a really nice 7° angle on the BT, VLD and Hybrid respectively. Hornady A-Max 30-cal projectiles (other than the 208-grainer) fall into this enforced shorter-range bracket too thanks to their 12.6° (and greater) boat-tail angles. (155gr = 13.5°, 168gr = 12.87°, and 178gr = 12.6°.)

Supersonic bullet shadowgraph

Even this boat-tail angle ‘rule’ doesn’t always seem to apply. Many older long-range Service Rifle shooters talk about good results at 1000 yards with some batches of 7.62mm match ammo in their 20″-barreled M14s using the 168gn SMK. I’ve successfully used Hornady and Sierra 168s at 1000 yards in 30-cal magnums which drive the bullets fast enough to keep out of trouble at this distance. This is still not recommended of course thanks to their low BCs compared to better long-range speciality bullets.

Supersonic bullet shadowgraph 7.5mm Swiss
These four photos show the substantial changes in the shock ware and turbulence patterns for the same bullet at different velocities. The “M” stands for Mach and the numerical value represents the velocity of the bullet relative to the speed of sound at the time of the shot. Photos by Beat Kneubuehl.

Transonic Issues with .223 Rem in F-TR
I was much exercised by [concerns about transonic instability] in the early days of F-Class, when I was shooting a .223 Rem with 80-grainers at 2,800 fps MV or even a bit less. Even the optimistic G1 ballistic charts of the time said they’d be subsonic at 1000 yards. (Bryan Litz’s Point Mass Ballistic Solver 2.0’s program says 1,078 fps at 1000 yards at 2,800 fps MV in standard conditions for the SMK; below 1.2 MACH beyond a point somewhere around 780 yards.) In fact they shot fine in a large range of conditions apart from needing around 60% more windage allowance than 6.5mm projectiles [shot with a larger cartridge]. The biggest problem apart from my wind-reading skills was constantly getting out of the rhythm to call to have the target pulled as the pits crew didn’t hear the subsonic bullets and had trouble seeing their little holes.

In the early days of F-TR I used a 24″ barrel factory tactical rifle that was billed as F-TR ready — it wasn’t! The much touted 175gr Sierra MatchKing, as used in the US military M118LR sniper round, was allegedly good at 1000 yards at .308 velocities — but it wasn’t! It would group OK in [some calm] conditions, but any significant change would cause a much greater deflection on the target than the ballistic charts predicted, so transonic flight was obviously making it barely stable. I also suspect conditions on the day had a big effect as Litz’s program says [the 175gr SMK] is just subsonic at 2,650 fps MV at 1,000 in standard conditions. Throw in MV spread and there was a risk of some round remaining supersonic, while others went transonic. Plus warmer or colder air moving onto the range under some conditions might change things.

I used the combination on Scotland’s notorious Blair Atholl range at 1000 yards in one competition in a day of cold headwinds from the north and frequent rain squalls. The temperatures plummeted during the squalls (and the wind went mad too!) and what was an ‘interesting group pattern’ outside of squall conditions changed to seeing me do well to just stay on the target frame at all. On ranges other than Blair (which is electronic, so no pits crew), target markers reported they heard faint supersonic ‘crack’ and saw round holes on the paper, so the bullets appeared to remain stable and just supersonic in summer shooting conditions.

Transonic Problems with M118LR 7.62×51 Ammo
Confirmation of this transonic performance phenomenon has since come from USMC snipers who say the M118LR’s performance ‘falls off a cliff’ beyond 800m (875 yards), which is just what I found when shooting the bullet at slightly higher than M118LR muzzle velocities. A move to the 190gr SMK with Vihtavuori N550 keeping the MVs reasonable gave a vast improvement in 1000-yard performance.

Practical Advice — Use a Bullet That Stays Supersonic
The ‘easy’ / better answer to all this is to use a design such as the 30-caliber, 185gr Berger LRBT with a reputation for good long range performance and to load it to achieve or exceed 1,350 fps at 1000 yards. If I can get the combination I’m using to be predicted to hold 1,400 fps at this range in a G7-based program calculation, I’m happier still.

Incidentally, the old long-range, 30-cal Sierra bullets (the venerable 190gr, 200gr, and 220gr MatchKings), with their extra length boat-tail sections, have a superb reputation for stable transonic / subsonic flight. They were used by GB and British Commonwealth ‘Match Rifle’ shooters at 1000, 1100, and 1200 yards for many years before the current bunch of 210gr and up VLDs and Hybrids appeared.

Supersonic space shuttle waveTransonic vs. Supersonic

The term “Transonic” refers to velocities in the range of Mach 0.8 to 1.0, i.e. 600–768 mph. It is formally defined as the range of speeds between the critical Mach number, when some parts of the airflow are supersonic, and a higher speed, typically near Mach 1.2, when the vast majority of the airflow is supersonic. Instability can occur at transonic speeds. Shock waves move through the air at the speed of sound. When an aircraft goes transonic and approaches the speed of sound, these shock waves build up in front of it to form a single, very large shock wave. This is dramatically illustrated in this Space Shuttle photo.

Permalink Bullets, Brass, Ammo, Tech Tip 6 Comments »
September 22nd, 2014

Pistol Champ Jessie Duff Profiled in Weatherby Video

To understand the heart and mind of a champion, watch this video profiling Jessie Duff, a 27-time world pistol shooting champion. Jessie is one of the hardest-working athletes in the shooting game. Jessie is America’s “leading lady” — perhaps the winningest female pistol shooter in the game today. The drive and dedication that has made Jessie a success are revealed in this video from Weatherby.

Jessie Duff WeatherbyJessie Duff’s Will to Win
Jessie explains how hard work brings titles: “To prepare for a championship, I’m on the range constantly.

My office is the gun range — that’s where I do my work.

I travel the country pullin’ the trigger, makin’ brass, smelling gunsmoke. I have to make sure that I’m in control because… there is no other person on the line with me, helping pull the trigger.

I have to pay attention to my foot placements, my set-ups, my positions, gettin’ the gun clean out of the holster, my reloads. I can’t think about it when I’m shooting. I can’t think about these small things. I have to focus on the sights and pulling the trigger. It’s just me and the gun.

[When] I step out on to the range, I simply have to be perfect — I have to be the best… I won’t settle for anything less.”

First-Ever Female Grand Master
Jessie Duff is the first woman in history to earn the title of USPSA Grand Master (GM), the highest rating conferred by the U.S. Practical Shooting Association (USPSA). To earn this prestigious ranking, Duff had to maintain an average above 95% in shooting classification courses, something never before achieved by a lady shooter. Jessie finished 2013 with a 95.39% average.

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September 21st, 2014

Solvent-Resistant Cleaning Jags Eliminate “False Positives”

Brass jags perform well for their intended purpose — with one hitch. Strong copper solvents can actually leech metal from the jag itself, leaving the tell-tale blue tint on your patches. This “false positive” can be frustrating, and may lead shooters to over-clean their barrels.

Nylon JagGunslick Nylon Spire-Point Jags
There are now some good alternatives to brass jags. The best may be the Gunslick® Nylon Snap-Lock™ jags shown at right. These never leave a “false positive”. A while back, Larry Bartholome, past USA F-Class Team Captain told us: “The best spear-type jags I have used are the GunSlick black nylon tips. I have used the model 92400 for the last couple years in my 6BR and 6.5-284s. Unlike the white plastic jags, these are strong and there’s no brass to worry about.” You can purchase these nylon jags directly from GunSlick just $1.49 each. At that price, they’re worth a try.

#92400 for 22 through 270 calibers: $1.49
#92421 for 30 through 375/8mm calibers: $1.49
#92423 for 38 through 38/9mm calibers: $1.49


MidwayUSA Nickel Cleaning JagsTipton Nickel-Coated Jags
If you prefer a metal jag, consider the Tipton Nickel-coated Ultra Jags, sold both individually and as a boxed set. All Tipton nickel-plated jags have 8-32 thread, except for the .17 caliber jag which has a 5-40 thread. The vast majority of user reviews have been very positive. A few guys have complained that the nickel-plated Tipton jags run oversize, but we use a .22-caliber jag in our 6mms anyway, so this hasn’t been a problem for us. Both the .22 cal and the .243/6mm cal nickel-plated jags cost $3.08 each at Midsouth. The complete 12-jag set, covering .17 to .45 calibers, including a flip-top carry case, is offered by Midsouth Shooters Supply for $17.62 (Midsouth item 094-500012).

Tipton also makes a nickle-plated 12-Jag Kit in a flat version with a see-through top. Sold by MidwayUSA for $16.99, this features an easy-to-use, clear-topped fitted caddy that can lie flat on your bench, or be attached vertically (to save space).

MidwayUSA Nickel Cleaning JagsMidwayUSA Nickel Cleaning Jags


Clear-Coating Your Brass Jags
If you’re reluctant to give up your collection of brass jags (after all they’ve worked pretty well so far), try covering the jag itself with a thin, transparent coating. Forum Member BillPA says: “I give the brass jags a coat of clear lacquer or acrylic; that works for me”. You may need to experiment to find a coating that stands up to your favorite solvent. BillPA says: “The only solvent I’ve found that eats the lacquer off is TM Solution. Butch’s, Shooter’s Choice, or Wipe-Out don’t seem to bother it. Most of the time I use rattle-can clear lacquer”. If you’re feeling creative, you could even color-code your jags by adding tints to the clear-coat.

Permalink Gear Review, Tech Tip 6 Comments »
September 20th, 2014

Life Lesson: Every Barrel is Unique. Same Load Registers 4 Different Velocities in 4 Different Barrels

Put the same load in a variety of barrels (with the same length and chamberings) and you’ll see a wide variance in muzzle velocity. In fact, it’s not unusual to see up to 100 fps difference from one barrel to the next. We demonstrated this with a comparison test of Lapua factory ammo.

Chron Testing Lapua Factory Ammo
At our Southern California test range, we chronographed Lapua 105gr 6mmBR factory ammo in three different 8-twist barrels of similar length. The results were fascinating. Lapua specs this ammo at 2790 fps, based on Lapua’s testing with its own 26″ test barrel. We observed a speed variance of 67 fps based on tests with three aftermarket barrels.

barrel speed testing

Brand ‘S’ and Brand ‘PN’ were pre-fit barrels shot on Savage actions. Brand ‘K’ was fitted to a custom action. All test barrels were throated for the 100-108 grain bullets, though there may have been some slight variances in barrel freebore. With a COAL of 2.330″, the rounds were “jumping” to the rifling in all barrels. Among the four barrels, Brand ‘PN’ was the fastest at 2824 fps average — 67 fps faster than the slowest barrel. Roughly 10 fps can be attributed to the slightly longer length (27″ vs. 26″), but otherwise this particular barrel was simply faster than the rest. (Click Here for results of 6mmBR Barrel Length Velocity Test).

Results Are Barrel-Specific, Not Brand-Specific
These tests demonstrate that the exact same load can perform very differently in different barrels. We aren’t publishing the barrel-makers’ names, because it would be wrong to assume that ‘Brand X’ is always going to be faster than ‘Brand Y’ based on test results from a single barrel. In fact, velocities can vary up to 100 fps with two identical-spec barrels from the SAME manufacturer. That’s right, you can have two 8-twist, 26″ barrels, with the same land-groove configuration and contour, from the same manufacturer, and one can be much faster than another.

Don’t Demand More Than Your Barrel Can Deliver
We often hear guys lament, “I don’t get it… how can you guys get 2900 fps with your 6BRs and I can only get 2840?” The answer may simply be that the barrel is slower than average. If you have a slow barrel, you can try using more powder, but there is a good chance it may never run as fast as an inherently fast barrel. You shouldn’t knock yourself out (and over-stress your brass) trying to duplicate the velocities someone else may be getting. You need to work within the limits of your barrel.

Factory Ammo Provides a Benchmark
If you have a .223 Rem, 6BR, .243 Win, 6.5×47 Lapua, 6.5×55, .308 Win, 30-06, or 300 WM Rifle, we recommend you buy a box of Lapua factory-loaded ammo. This stuff will shoot great (typically around half-MOA), and it can give you a baseline to determine how your barrel stacks up speedwise. When you complete a new 6BR rifle, it’s wise to get a box of the factory ammo and chronograph it. That will immediately give you a good idea whether you have a slow, average, or fast barrel. Then you can set your velocity goals accordingly. For example, if the factory 6BR ammo runs about 2780-2790 fps in your gun, it has an average barrel. If it runs 2820+ in a 26″ barrel (or 2835 fps in a 28″), you’ve got a fast tube.

Permalink Gunsmithing 8 Comments »
September 20th, 2014

Slow-Motion Video Shows Bullets Pass Through Muzzle Brakes

Proof Research High speed photography muzzle brakeIf you want to see how a muzzle brake really works, definitely watch this remarkable slow-motion video compiled by Proof Research.

This amazing video features a variety of firearms: suppressed 9mm pistol, .338 Norma rifle, .300 WinMag rifle, 12ga comp’d shotgun, plus an AR15 and AR10.

This Must-Watch Video Has Some Amazing Ultra-Slow-Motion Segments

Watch the ultra-slow motion segment at the 2:55 mark and you can actually see a .30-cal bullet spin its way through the muzzle brake, leaving trail of flame that blows out the ports. Interestingly, at the 3:10 mark, you can also see a bright “afterburn” ball of fire that forms a few inches ahead of the muzzle milliseconds after the bullet has left the barrel. Perhaps this is late ignition of unburned powder?

Video Time Line (Test Firearm Segments)

  • 00:23 – 00:53: Walther 9mm PPQ Pistol, Osprey 45 Suppressor
  • 00:54 – 01:44: Proof Research .338 Norma Rifle, Carbon-wrapped Barrel, 3P Muzzle Brake
  • 01:45 – 02:22: Remington 870 12ga Shotgun, VangComp Ported
  • 02:23 – 03:40: Proof Research 300 WM Rifle, Carbon-wrapped Barrel, 51T Muzzle Brake
  • 03:41 – 04:14: AR15 (M16) Rifle, Vltor A5-A5H2 Buffer
  • 04:15 – 05:23: AR10 .338 RCM

Proof Research High speed photography muzzle brake

Proof Research (PR) sells high-grade hunting and tactical rifles built with PR-made actions and carbon-wrapped barrels. For more information, visit ProofResearch.com.

Credit Steve of TheFirearmBlog.com for this YouTube video. Footage by JNZ for Proof Research.

Permalink - Videos, Bullets, Brass, Ammo 3 Comments »