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September 19th, 2023

Wrong Cartridge in Chamber — What Can Happen

Ruptured Cartridge Case

If you don’t match your ammo to your chamber, bad things can happen, that’s for sure. A while back, Forum member BigBlack had an experience at the gun range that reminds us of the importance of safety when shooting. He encountered evidence that someone had fired the wrong cartridge in a 7mm WSM rifle. The problem is more common than you may think. This Editor has personally seen novices try to shoot 9mm ammo in 40 S&W pistols. BigBlack’s story is along those lines, though the results were much more dramatic. It’s too bad a knowledgeable shooter was not nearby to “intervene” before this fellow chambered the wrong ammo.

7mm-08 is Not the Same as a 7mm WSM
BigBlack writes: “I know this has probably been replayed a thousand times but I feel we can never be reminded enough about safety. This weekend at the range I found a ruptured case on the ground. My immediate thoughts were that it was a hot load, but the neck area was begging for me to take a closer look, so I did. I took home the exploded case and rummaged through my old cases until I found a close match. From my investigative work it appears someone shot a 7mm-08 in a 7mm WSM. Take a look. In the above photo I’ve put together a 7mm WSM case (top), the ruptured case (middle), and a 7mm-08 case (bottom).”

The photo reveals what probably happened to the 7mm-08 case. The shoulder moved forward to match the 7mm WSM profile. The sidewalls of the case expanded outward in the much larger 7mm WSM chamber until they lacked the strength to contain the charge, and then the case sides ruptured catastrophically. A blow-out of this kind can be very dangerous, as the expanding gasses may not be completely contained within the action.

Can’t Happen to You? Think Again.
This kind of mistake — chambering the wrong cartridge — can happen to any shooter who is distracted, who places even a single wrong round in an ammo box, or who has two types of ammo on the bench. One of our Forum members was testing two different rifles recently and he picked up the wrong cartridge from the bench. As a result, he fired a .30-06 round in a .300 Win Mag chamber, and the case blew out. Here is his story:

“I took two of my hunting rifles I have not used for over 25 years to the range yesterday to get new scopes on paper, a .30-06 and .300 Win Mag. I had four boxes of old Winchester factory ammo (two of each cartridge), which had near identical appearances. I accidentally chambered a .30-06 round in the Sako .300 Win Mag rifle. It sprayed powder on my face and cracked the stock at the pistol grip. If I had not been wearing safety glasses I might be blind right now.

Safety eyewear glasses
You should always wear protective eyewear, EVERY time you shoot.

“I feel lucky and am very thankful for being OK — other than my face looks funny right now. I am also grateful for learning a valuable lesson. I will never put two different cartridges on the bench at the same time again.”

READ More about this incident in our Shooters’ Forum.

Permalink - Articles, Bullets, Brass, Ammo, Tech Tip 1 Comment »
January 20th, 2021

Doh! Make Sure Your Ammo Fits Your Chamber!

Ruptured Cartridge Case

If you don’t match your ammo to your chamber, bad things can happen, that’s for sure. A while back, Forum member BigBlack had an experience at the gun range that reminds us of the importance of safety when shooting. He encountered evidence that someone had fired the wrong cartridge in a 7mm WSM rifle. The problem is more common than you may think. This Editor has personally seen novices try to shoot 9mm ammo in 40sw pistols. BigBlack’s story is along those lines, though the results were much more dramatic. It’s too bad a knowledgeable shooter was not nearby to “intervene” before this fellow chambered the wrong ammo.

7mm-08 is Not the Same as a 7mm WSM
BigBlack writes: “I know this has probably been replayed a thousand times but I feel we can never be reminded enough about safety. This weekend at the range I found a ruptured case on the ground. My immediate thoughts were that it was a hot load, but the neck area was begging for me to take a closer look, so I did. I took home the exploded case and rummaged through my old cases until I found a close match. From my investigative work it appears someone shot a 7mm-08 in a 7mm WSM. Take a look. In the above photo I’ve put together a 7mm WSM case (top), the ruptured case (middle), and a 7mm-08 case (bottom).”

The photo reveals what probably happened to the 7mm-08 case. The shoulder moved forward to match the 7mm WSM profile. The sidewalls of the case expanded outward in the much larger 7mm WSM chamber until they lacked the strength to contain the charge, and then the case sides ruptured catastrophically. A blow-out of this kind can be very dangerous, as the expanding gasses may not be completely contained within the action.

Can’t Happen to You? Think Again.
This kind of mistake — chambering the wrong cartridge — can happen to any shooter who is distracted, who places even a single wrong round in an ammo box, or who has two types of ammo on the bench. One of our Forum members was testing two different rifles recently and he picked up the wrong cartridge from the bench. As a result, he fired a .30-06 round in a .300 Win Mag chamber, and the case blew out. Here is his story:

“I took two of my hunting rifles I have not used for over 25 years to the range yesterday to get new scopes on paper, a .30-06 and .300 Win Mag. I had four boxes of old Winchester factory ammo (two of each cartridge), which had near identical appearances. I accidentally chambered a .30-06 round in the Sako .300 Win Mag rifle. It sprayed powder on my face and cracked the stock at the pistol grip. If I had not been wearing safety glasses I might be blind right now.

Safety eyewear glasses
You should always wear protective eyewear, EVERY time you shoot.

“I feel lucky and am very thankful for being OK — other than my face looks funny right now. I am also grateful for learning a valuable lesson. I will never put two different cartridges on the bench at the same time again.”

READ More about this incident in our Shooters’ Forum.

Permalink Reloading, Tech Tip 5 Comments »
November 20th, 2020

New SAAMI Cartridges: 277 SIG FURY, 6.5 WBY RPM, 6.8 Western

.277 SIG Fury saami cartridge specification 80000 psi

The Sporting Arms and Ammunition Manufacturers’ Institute, Inc., (SAAMI), has announced the acceptance of three (3) new cartridges for SAAMI standardization: 1) 277 SIG FURY; 2) 6.5 Weatherby Rebated Precision Magnum (WBY RPM); 3) 6.8 Western. While the 277 SIG FURY was developed originally for the U.S. Military, it should serve well for hunters, as will the new 6.5 Weatherby RPM and 6.8 Western. SAAMI has standardized the dimensions, max pressures, and load specs for all these three new cartridges.

277 SIG FURY from SIG Sauer

Developed by SIG SAUER for the U.S. Military, the 277 SIG FURY boasts a SAAMI maximum average pressure of 80,000 psi, driving a 135-grain bullet to 3,000+ fps. That 80K PSI pressure is WAY higher than almost all other cartridge types. To achieve these high pressures, the 277 FURY uses a hybrid case with a brass body and harder alloy metal case head. This design allows the cartridge to run very high pressures. Dan Horner of SIG Sauer told us: “When the handloaders get hold of this brass, it will be a game-changer for sure”. We envision this cartridge could be necked down to 6.5 mm and it would dramatically out-perform the 6.5 Creedmoor. And yes the official name of the cartridge is all caps “277 SIG FURY”.

LINK: 277 SIG FURY official SAAMI Cartridge and Chamber Diagram (PDF)

.277 SIG Fury saami cartridge specfication 80000 psi

.277 SIG Fury saami cartridge specfication 80000 psi

6.5 Weatherby Rebated Precision Magnum

Developed by Weatherby, the 6.5 Weatherby Rebated Precision Magnum (WBY RPM) was introduced with a maximum average pressure of 65,000 psi, with a 140-grain bullet traveling at a velocity of 3,075 fps. The 6.5 WBY RPM offers signficantly higher velocities that most other 6.5mm cartridges, including the 6.5-284 and .265 Win Mag. SEE 6.5 Cartridge Comparison Table

LINK: 6.5 Weatherby RPM official SAAMI Cartridge and Chamber Diagram (PDF)

6.5 weatherby rebated precision magnum cartridge WBY RPM SAAMI

6.8 Western from Winchester

Developed by Olin Winchester, the 6.8 Western was introduced with a maximum average pressure of 65,000 psi, with a .277-caliber 175-grain bullet traveling at a velocity of 2,840 fps. A shorter variant of the Winchester Short Magnum (WSM) family, the new cartridge appears to be about .090″ shorter than the .270 WSM. It has the same 35-degree shoulder angle as the .270 WSM.

LINK: 6.8 Western official SAAMI Cartridge and Chamber Diagram (PDF)

6.8 western rebated precision magnum cartridge western .270 wsm SAAMI

For additional information on these new cartridge designs and other recently accepted cartridge and chamber designs, visit SAAMI.org.

Permalink Bullets, Brass, Ammo, Gear Review, News, Tech Tip 9 Comments »
December 3rd, 2019

F-Class — Best Cartridge Options for Mid-Range and Long Range

F-Open F-TR F-class competition cartridge guide comparison Emil Covan

Cartridge Choices for F-Class Competition

By Emil Kovan
Kovan Match Rifles LLC, www.matchrifles.com

There are hundreds of cartridge types capable of winning in F-Open. For F-TR you can shoot either the .223 Rem or .308 Win, but you have many load options. This article will focus on proven choices, currently used by the top F-Class shooters in the world. Our discussion will analyze cartridge selection based on the four different F-Class sub-disciplines: Open Mid-Range, Open Long-Range, F-TR Mid-Range, and F-TR Long Range.

F-Open F-TR F-class competition cartridge guide comparison Emil Kovan
Click image to view full-screen photo.

Mid-Range F-Open Cartridges

For starters, a .300 WSM is certainly capable of winning mid-range matches but it is not ideal. So what is ideal, and why? F-Class Mid-Range matches usually are usually shot at 300, 500, or 600 yards — or all three. At those distances the 6mm and 6.5mm cartridges rule. In moderate conditions, the 6mm Dasher is unbeatable. Its low recoil along with its super grouping ability and good ballistics make it my number one choice for Mid-Range.

Best bullets for the 6mm Dasher are: Vapor Trail 103gr, Berger 105 Hybrid, 108 BT, and 105 VLD (hunting). Best powders are: Varget, H4895, and Reloder 15.

Choices for Mid-Range in Tougher Conditions:
We all know that conditions are not always “moderate” that’s why something a little bit bigger will save you a “Nine” or two. The 6.5X47 Lapua was designed for 300-meter competition, but as soon as it was released, it was adopted by F-Class, benchrest, and tactical shooters. It offers great ballistics with very low recoil and big “accuracy window”. Lapua makes great brass for it (no surprise there) and Berger makes great bullets: 130gr VLD, 140gr VLD, 140gr Hybrids. Best powders in most barrels are Varget and H4350, I don’t use double-based powders such as Reloder 17 and the Vihtavuori N500 series because of their unpredictable performance day to day (greater temp sensitivity).

The 6.5X47 Lapua necked down to 6mm is also a great option for mid range matches. I was able to easily get 3200 fps with 105 hybrids and H4350.

Choice for Long-Range F-Open Competition

In Long-Range F-Open Class (out to 1000 yards), the big, high-BC bullets rule. If I had to pick one cartridge for F-Class (both mid- and long-range) I would pick the .284 Winchester or one of its variants. The .284 Win is currently dominating in F-Open competition. It offers great barrel life, it is super-easy to tune and its recoil is very manageable. The best bullets for it by far (in my opinion), are the Berger 180 Hybrids. But Sierra’s new 183gr MK bullet (with factory-uniformed meplats) seems to perform very well as does the Berger 180 VLD. Best powders for the .284 Win are H4350 and H4831SC.

F-Open F-TR F-class competition cartridge guide comparison Emil Covan

Long-Range Only F-Open Cartridge
As much as I like the .284 Win, for long-range competitions I like the .300 WSM even more. If you look at a .300 WSM and a 6mm Dasher side by side, they appear almost identical in geometry — the .300 WSM looks like an “super-sized” Dasher. Both cartridges are currently the “darlings” of long-range benchrest due to their extraordinary grouping ability and huge “node’’ windows. Big accuracy windows allow loads to perform well in different conditions and geographical locations. That’s obviously very important if you travel to compete. The .300 WSM loaded with Berger 215gr or 230gr Hybrids is very tough to beat at long range, and it is currently my number one choice.

The 7mm RSAUM is another outstanding long-range round. It resembles a 6BR on steroids and it is almost as easy to tune. Best bullets for it are Berger 180gr Hybrids, 195gr EOLs, and Sierra’s 183gr MatchKing. Best powders for the 7mm RSAUM are: H4350, H4831SC, and VV N160.

Top Caliber/Bullet Combos for F-TR

In F-TR competition, the choice is clear — a .308 Win throated for Berger 185gr BTLRs and 200gr Hybrids will win in mid-range AND long-range comps. Many championships have been won, and many records set with those two bullets in the .308 Win. To quote Danny Biggs (a two times FTR National Champion) “The 185 BTLR is the best bullet for .308 Win ever made”.

The Berger 215gr Hybrids have been used to win many competitions including recently the 2015 F-Class Nationals. Bryan Litz won both the Mid-Range and Long-Range 2015 Championships using 215s. Bryan’s rifle is shown below:

Bryan Litz F-TR 2015 National Championship rifle

I recommend chambers throated for the 185/200 grain projectiles over the 215/230 grain bullets. The reason is that if you have your barrel throated out for the 215s or the 230s, you could have a “slow” barrel and max out on pressure before the desired velocity is reached. Optimum freebore for the 230s is too long for the 185/200s, so you would be limited to using only 215/230gr bullets in that barrel.Furthermore, the recoil increase with heavier bullets is substantial, causing the rifle to be more difficult to shoot.

.223 Remington Cartridge Diagram.223 Rem — Not A Competitive Option
I would stay away from the .223 Remington. On paper the 90gr VLD will shoot inside most .308 Win loads even at a 1000 yards. But in reality, on average, the .223 Rem, regardless of what powder/bullet combo is used, cannot compete with the .308 Win. [Editor: The equipment lists at major F-TR matches will confirm Kovan’s conclusion here.]

Conclusion (and Other Options)
This article covers only the (currently) most popular cartridge/bullet combos for F-Class (F-Open and F-TR). As I said in the beginning, many cartridge types are capable of winning but are not listed due to their low popularity, case design, or lack of quality components. All of the above information is based on my personal experience and it is meant to help new shooters choose the right cartridges for F-Class matches. Thanks for reading and good luck — Emil Kovan

Emil Kovan F-Class competition bio photoEmil Kovan Competition History:

– 2014 F-Class Open National Champion

– 2015 F-Class Open National Championship, Silver Medal

– F-Class Open National Championship Teams, 2015, 2014, 2013, Shooting Team Member

– Over 15 wins in Regional and State Championships in Palma, F-TR, F-Open

– 2013 U.S. National Team Member

– 2017 U.S. National Development Team Member

Permalink - Articles, Bullets, Brass, Ammo, Competition 2 Comments »
March 21st, 2014

Richard Franklin — He’s Alive and Well

DVDOur readers have asked, “What’s happened to Richard Franklin? Is he still making rifles?” Well, we’re pleased to tell you that Richard is doing fine. He is up in Montana, building a new house, doing most of the construction himself. The good news is that the new house will have a big workshop, and Richard hopes to start building a few rifles near the end of this year. He won’t be taking orders for quite a while. But in the meantime, Richard is still sharing his knowledge about stock-making, gunsmithing, and varmint hunting via DVDs that can be purchased online.


Groundhog Hunting with Richard Franklin

A few seasons back, gunsmith Richard Franklin and his shooting partner Roy both achieved a varmint hunter’s dream — nailing a groundhog at 1000+ yards. The guns that did it were two of Richard’s 300 Varminters. These are 300 WSMs that push a 125gr bullet through 32″, 15-twist barrels to achieve velocities approaching 4000 fps. Here is Richard’s report, condensed for the Daily Bulletin.

Richard's Custom Rifles

The 1005-Yard Groundhog Adventure, by Richard Franklin
September 20th found Roy and I on our last groundhog hunt of the year. Bow season for Deer begins Oct. 4th and we wanted time to ready ourselves. Roy had killed 99 hogs so far this year and I had killed 97. In the morning, we headed over to the Overstreet farm leased by our good friend Richard Ruff. We set up the shooting trailer on top of a hill where we had a good view of several brush piles around the pasture. In the first ten minutes Roy put a hog in the air about four feet at 497 yards with his 300 Varminter, giving Roy an even 100 hogs for the year. I shot hogs at 180 yards, 506 yards, and 456 yards. That gave me a total of 100 for the year.

Richard's Custom RiflesThen we decided to go up to Danny’s and Bill’s hard rock dairy farm. We set up on the top of a high hill and shoot over the farm buildings to another mountain where there is a huge pasture with large rock piles. We scanned this pasture for about an hour and a half. Roy has a pair of Ziess 8-power binocs and I use a pair of the Leica 10-power Geovids with built-in laser rangefinder. I also have a “Big Eyes” set-up — two 22-power Kowa spotting scopes mounted on a bracket and used on a sturdy tripod. After some time searching the field for hogs and seeing none, we decided to pack up and go to a farm owned by Donnie Campbell. Over the years we have shot many a hog here. Roy once shot one here at 905 yards and my longest shot on this farm was 714 yards. Most kills here are made at over 400 yards. There’s a perfect place to shoot hogs from a single firing position. At the back property line was a big hill about 400 feet higher than the surrounding pastures and we could see and shoot about 200 degrees around us all the way out to 1,200 yards.

Setting Up the 1005-yard Shot
I had the first shot and nailed an easy one at about 140 yards. He was thinking he was hidden from view. Wrong! BLAM…POOF. Roy nailed a hog at 469 yards under an old pear tree. Roy nailed another hog at 522 yards by a big log pile where we had killed about ten hogs this summer. Roy was looking through the Big Eyes and called out, “Hey Rich…I got you one way over there on the next farm by the edge of the woods.” I ranged the hog with the Geovids four times, registering 1003, 1007, 1006 and 1005 yards. I decided on the 1005 as the distance. Checking my chart, I clicked up to 18 and 1/4 minutes. We had a very stiff wind blowing left to right. I have a Nightforce 8-32 power scope with the MLR reticle. I held the fourth windage dot and touched one off. I see the bullet strike nearly in line with the hog but low. I click up another minute and a half making a total of 19 3/4 minutes. Roy is watching all this through the Big Eyes and can see better than I can. He confirms where the first bullet strike was. I hold the same windage and touch off another round in my Bat-actioned, 32″, 15-twist Bartlein-barreled 300 Varminter. The hog was standing up for this shot. Through the scope I see the bullet’s vapor trail going straight for the hog. I lost the vapor trail before the bullet got there but I saw the hog flip over.

Hot damn, what a shot! After Roy shakes my hand and slaps me on the back, I walk over to the Big Eyes for a better look. “Roy, there’s another hog trying to fight that dead one,” I say. This hog (evidently both are males) is biting and dragging the dead hog. He is really going at it. Both hogs were evidently eating fallen acorns from the huge White Oak tree at the edge of the woods.

Richard's Custom Rifles

Roy Gets His Chance
I tell Roy, “Get up there on your bench and try that hog, I’ll spot for you.” Roy clicks up to 19 1/2 minutes and holds three feet for windage. Roy lets it go and I see the vapor trail going in on the hog. It hits a foot to the right and low. “Hey Roy”, I say, “click up two more minutes and hold one more foot of wind.” The hog ran in under the tree at the bullet’s impact but was back within 30 seconds. Roy is now clicked up and lets the second round go. I see the vapor trail dropping in on the hog but the bullet impacts dead in line, but still a bit low. “Roy — give it another minute and a half and hold the same wind”. I can hear Roy furiously working the bolt and chambering another round, then POW, and I see the vapor trail again. It looks like it’s gonna be in the middle of the hog but it drops right in under his neck, nearly hitting him. The hog vacates back under the tree for an instant but decides he is winning the fight against the dead hog and comes right back. Roy lets the fourth round go with the same hold as the last shot. I see the vapor trail of the 125 grain Ballistic Tip dropping right in on the hog, catching him perfectly in the shoulder. The live hog flips up and falls on top of the dead hog, his tail coming up stiff as a poker as he flags us that he is instantly dead.

Two 1000+ Yard Hits. A Record for Roy, Near-Record for Richard.
This was Roy’s longest shot ever. His previous record was 905 yards. This was my second longest shot, as I had killed a hog at 1018 yards seven years ago about 40 miles from this spot. I tell Roy that I’m putting up my hog rifle for the year. I’ll let this long shot register in my memory as the last Groundhog kill of 2008. Roy says “That’s fine, I’m gonna do the same.” Hog hunting is officially over for 2008. Now it’s time for Deer.

CLICK HERE to Visit Richard Franklin’s website and learn more about this ‘Hog hunt.

[Editor’s Note: Richard’s rifle has a BAT action and is able to drive the 125 Nosler at about 3975 fps. Roy has a Remington action on his 300 Varminter. The Rem doesn’t take high pressures as well as the BAT, so Roy’s load is down-loaded to about 3825 fps. Roy also uses a “boosted” Leupold rather than a Nightforce. Because of the difference in scopes, and the lower velocity, Roy needed more elevation clicks to reach the 1005-yard distance.]

Permalink Hunting/Varminting, News 1 Comment »
February 15th, 2014

Official 26 Nosler SAAMI Drawing Now Available

26 Nosler Cartridge Print SammiNosler has introduced a new 6.5mm (.264 caliber) hunting cartridge, the 26 Nosler. Nosler will initially offer 26 Nosler cartridge brass, and then, eventually, 26 Nosler loaded ammunition.

This new cartridge is designed to be a speedy, flat-shooting hunting cartridge, with performance exceeding a 6.5-284. This is possible because the 26 Nosler is a big, long cartridge with plenty of “boiler room”. Length from base to neck/shoulder junction is 2.33″ for the 26 Nosler, compared to 1.91″ for the 6.5-284 (and 2.04″ for a 7mm Rem Magnum). The 26 Nosler has a 35° shoulder angle and a magnum-size 0.534″ outside rim diameter.

The 26 Nosler cartridge can drive the Nosler 129 grain, AccuBond® LR bullet at 3400 fps. Zeroed at 350 yards, the 26 Nosler has a Point Blank Range of 0-415 yards. Loaded with the 129gr Accubond, the 26 Nosler retains as much velocity at 400 yards as a .260 Rem produces at the muzzle. This makes the 26 Nosler a “quintessential deer, antelope and long-range” cartridge according to company CEO/President Bob Nosler.

Nosler has just released the SAMMI print for this cartridge. CLICK HERE for SAMMI Print PDF.

26 Nosler Cartridge Print Sammi

Credit Grant G. for story tip. We welcome reader submissions.
Permalink Bullets, Brass, Ammo, New Product 16 Comments »