Top to bottom – Remington firing pin assembly with ISS, Tubb SpeedLock alloy-composite system without ISS (current versions have dual, opposite-wound springs), and Remington short action firing pin assembly without ISS.
The U.S. Army Marksmanship Unit regularly publishes technical articles on the USAMU Facebook page. One informative USAMU article covered mechanical issues and related ignition irregularities that can cause vertical fliers even with good ammunition in an otherwise excellent rifle. We highly recommend you read this article, which offers some important tech tips.
Vertical Dispersion: Mechanical/Ignition Issues?
Poor or inconsistent ignition has long been known to be one of the “usual suspects” when one encounters vertical fliers that just shouldn’t be there. By having a sense of some of the basic principles involved, and a few basic areas to check, the shooter may avoid colsiderable frustration, not to mention time, expensive loading components and barrel wear.
Is your well-built rifle of high-quality components plagued with vertical fliers across more than 1-3 handload combinations? Consider the bedding, crown and scope/sight mounts. Are they correct? If so, then you might check for ignition issues before boldly undertaking an extensive, expensive, and quite possibly fruitless quest for the “magic handload”.
SEEING IS BELIEVING: While the author had been aware for many years that poor ignition should be considered and ruled out when dealing with vertical fliers in an otherwise-excellent rifle, actually seeing the problem and its almost instantaneous cure really drove the lesson home.
He was working with a “dot” rifle – a .22 LR match rifle that really stacked bullets into little piles at 50 yards and beyond. With one lot of ELEY Tenex, it produced consistent “bughole” groups at 50, but with another, selected lot of Tenex, similar groups were regularly ruined by single, vertical fliers that did not appear in other rifles. Rather than spending days burning up expensive, select ammunition looking for “magic lots”, he contacted a well-respected rimfire gunsmith and explained the situation.
Without so much as batting an eye, the highly-experienced ‘smith tore into the rifle’s action, and quickly found the cause(s) of the problem. He discovered a demonstrably weak firing pin spring, plus a chip out of the face of the firing pin where it contacted the cartridge rim.
After replacing and tuning the offending parts, the rifle immediately began shooting tiny, bughole groups with the previously “unacceptable” lot of Tenex. Centerfire rifles can also benefit from ensuring positive, consistent ignition. A wise riflesmith is literally worth his weight in gold!
So, what are some issues we as shooters can inspect in our rifles to help determine if ignition woes could be part of our problem? At the club level, ask yourself if that “experienced” Remington, Winchester 70, or even Springfield-based match bolt gun you’re using is still running its’ original 40-80 year-old factory striker spring? If so, a new replacement is cheap insurance against current or future problems. (And BTW, it might be best to stick to the normal, factory-spec spring weight. A super-powerful spring can cause vertical, just as a weak one one can.) Along with that, a routine check for proper firing-pin protrusion is a quick preventive measure that can rule out potential issues.
Other areas to consider are the centering and consistency of the firing pin’s operation in the bolt. Admittedly, with the increasing use of precision-machined custom actions, this is becoming less an issue every day. Below is the firing pin assembly from a custom BAT action:
However, particularly with factory actions, a very quick and easy check is to remove the bolt, let the firing pin go forward, and look at the firing pin tip through the firing pin hole. Is the tip off-center in the hole, and possibly striking it as it moves forward? Is the hole out-of-round or burred from being struck repeatedly? If so, a trip to the riflesmith is likely in order.
Similarly, machining issues in the bolt/firing pin system can lead to rough and erratic firing pin movement, in which the firing pin drags against an internal surface of the bolt. In high-quality rifles these issues are relatively rare, but not unheard-of, and it takes mere minutes to rule them out. It may be worthwhile to remove the cocking piece/firing pin/spring assembly and look for any unusual gouges, dings, peening, burrs or signs of abnormal wear.
This task is especially easy with Winchester 70s, Springfields, and the similar Mauser 98s, involving little more than the push of a button and unscrewing the cocking piece assembly. This is just one of the many reasons these tried-and-true actions have earned such a loyal following in the field, among hunters who must maintain their rifles away from a shop.
Particularly with older rifles, watch for and remove excess grease (or even Cosmoline!) from both the firing pin assembly and inside the bolt. This can help improve firing pin speed and consistency. Other bolt-action designs may need a take-down tool or other measures.
As part of this inspection, AFTER ENSURING THE RIFLE IS UNLOADED, slowly cock the rifle, dry-fire, and repeat several times. Listen carefully near the action for inconsistency in the sounds it generates. Does the striker falling make the same sound each time? Do you hear or feel grinding upon operation? If so, where?
Be sure to check the operation of the cocking piece (bolt shroud), firing pin within the bolt shroud, the cocking piece cam and the rear of the bolt body where the cocking piece cam operates. As with our examination for abnormal wear marks discussed above, look for marks indicating roughness or a possible need for light polishing. Then, clean and lightly grease the bearing surfaces while you’re at it.
Remington 700 bolt shroud and cocking cam
These are relatively easy checks that shooters can undertake to perform a preliminary inspection on their own. Other mechanical issues can also cause ignition issues, chiefly centered around the action of the trigger, sear and sear spring. If these are suspected, a trip to an experienced, qualified riflesmith for diagnosis is recommended. We hope you find this information helpful! Join us again next week, and in the meantime, enjoy the shooting sports safely!
GRS Laminated Stock from Norway (Imported by EuroOptic Ltd.)
Some folks think of laminated stocks as modestly-priced, “low-tech” alternatives for varmint and hunting rifles. In fact, for shooting disciplines that do not demand ultra-light weight, good laminated stocks give up nothing in performance to the most sophisticated composite stocks. And with laminates, it is relatively easy to fine-tune fit and ergonomics to suit the individual shooter. Available in a wide choice of colors, laminated stocks can also be very handsome. In our Shooters’ Forum, you’ll find a thread showcasing laminated stocks. It’s worth viewing. There are many interesting designs, and a wide variety of rifles ranging from “walking varminters” to long-range prone rifles.
FalconPilot’s Shehane Tracker in Sierra Laminate with Clearcoat
Shehane African Obeche Wood Laminated Hunter by Cigarcop
20 Practical Varminter (UK Custom posted by PNSE)
Prone Rifle by Carl Bernosky (posted by 1Shot)
F-Class (Special) by Alex Sitman (posted by J. DeKort)
Head over to Midsouth Shooters Supply for some of the best bargains of the year. Right now Midsouth is running a huge End of Year Clearance Sale. But this is no ordinary promotion. The deals get better every day until 2019 arrives. You see, every day, through December 31, 2017, prices drop. If you hold out ’til the end, you can score the best deals — up to 70% off the original price. However, if you wait too long, someone else may get the product(s) you want.
Nearly 1000 Clearance Items — Here are Examples:
Nearly 1000 items are on sale including tools, dies, reloading components, ammo, optics, holsters, gun books, and more. Above are just a few samples. You’ll find exceptional pricing on Norma brass and loaded ammo, Hornady loaded ammunition and reloading gear, Lapua Scenar bullets, and RCBS loading dies. Folks — you really should check out this Midsouth Sale. If you time it right you can get items at half-off or better. Here are just three of the Clearance Sale items … there are over 990 more at time of publication!
Looking to acquire a handgun for personal protection of home and family? There are countless options on the market. Your buying decision may be simplified by seeing what other consumers have chosen, as revealed by nationwide sales trends. You can now check firearms sales figures using “Gun Genius”, a new data-crunching service of Gunbroker.com. On GunGenius.com you can select any type of firearm (handgun, rifle, shotgun)* and see the top sellers for that category.
Here are the five (5) top-selling NEW semi-auto pistols for November 2018:
And here are the five (5) top-selling NEW Revolvers for November 2018:
*Chose semi-auto pistols, revolvers, semi-auto rifles, bolt-action rifles, lever-action rifles, single-shot rifles, semi-auto shotguns, pump shotguns, and more. You can also filter for sales trends (upwards and downwards). Drill down to see detailed product specifications and current prices.
The U.S. Army Marksmanship Unit (USAMU) regulary publishes “how-to” articles on the USAMU Facebook page. One informative “Handloading Hump Day” article covers chronograph testing and statistical samples. We highly recommend you read this article, which offers some important tips that can benefit any hand-loader. Visit the USAMU Facebook page next Wednesday for the next installment.
Chronograph Testing — Set-Up, Sample Sizes, and Velocity Factors
Initial Chronograph Setup
A chronograph is an instrument designed to measure bullet velocity. Typically, the bullet casts a shadow as it passes over two electronic sensors placed a given distance apart. The first screen is the “start” screen, and it triggers an internal, high-speed counter. As the bullet passes the second, or “stop” screen, the counter is stopped. Then, appropriate math of time vs. distance traveled reveals the bullet’s velocity. Most home chronographs use either 2- or 4-foot spacing between sensors. Longer spacing can add some accuracy to the system, but with high-quality chronographs, 4-foot spacing is certainly adequate.
Laboratory chronographs usually have six feet or more between sensors. Depending upon the make and model of ones chronograph, it should come with instructions on how far the “start” screen should be placed from one’s muzzle. Other details include adequate light (indoors or outdoors), light diffusers over the sensors as needed, and protecting the start screen from blast and debris such as shotgun wads, etc. When assembling a sky-screen system, the spacing between sensors must be extremely accurate to allow correct velocity readings.
Statistics: Group Sizes, Distances and Sample Sizes
How many groups should we fire, and how many shots per group? These questions are matters of judgment, to a degree. First, to best assess how ones ammunition will perform in competition, it should be test-fired at the actual distance for which it will be used. [That means] 600-yard or 1000-yard ammo should be tested at 600 and 1000 yards, respectively, if possible. It is possible to work up very accurate ammunition at 100 or 200 yards that does not perform well as ranges increase. Sometimes, a change in powder type can correct this and produce a load that really shines at longer range.
The number of shots fired per group should be realistic for the course of fire. That is, if one will be firing 10-shot strings in competition then final accuracy testing, at least, should involve 10-shot strings. These will reflect the rifles’ true capability. Knowing this will help the shooter better decide in competition whether a shot requires a sight adjustment, or if it merely struck within the normal accuracy radius of his rifle.
How many groups are needed for a valid test? Here, much depends on the precision with which one can gather the accuracy data. If shooting from a machine rest in good weather conditions, two or three 10-shot groups at full distance may be very adequate. If it’s windy, the rifle or ammunition are marginal, or the shooter is not confident in his ability to consistently fire every shot accurately, then a few more groups may give a better picture of the rifle’s true average.
Here’s a great deal if you need a high-quality tactical, F-Class, benchrest, high power, silhouette, ELR, or hunting stock. Right now McMillan Fiberglass Stocks is discounting ALL its stocks 15% (fifteen percent). That’s right, EVERY McMillan rifle stock in inventory is on sale NOW for fifteen percent (15%) Off. But you must act quickly! This special 15% Off Sale concludes at 11:59 pm MST on December 29, 2018. So you have two more days to shop. Remember, this sale applies to ALL McMillan stocks, but the sale ends at 11:59 PM on 12/29/2018. Use Code STOCK2019 during check-out to save 15%.
Note — Along with the 15% Savings, Free Shipping applies to orders over $50, standard ground delivery in the Continental USA. Shipping charges on previous orders will not be reimbursed. This offer cannot be combined with other promotions or offers. Offer expires December 29th at 11:59 pm MST.
Sierra Bullets asked a few hand-loaders to reveal their favorite reloading tool or accessory: “What is your favorite ‘don’t know how you ever lived without it’ piece of reloading equipment?” Some of the answers are listed below. We were interested to see some high-tech, micro-processor items mentioned, such as the AMP Annealer, and the AutoTrickler powder dispenser. Old standbys, such as the rugged RCBS Rockchucker and Dillon 650, also made the favorites list. You can nominate your own favorite reloading hardware in the comments section of the Sierra Bullets Blog.
Sierra Bullets Ballistic Technician Philip Mahin answered: “A comparator gauge to measure from the base of a case to the ogive of the bullet. This bypasses the tip of the bullet, so I can repeat the same seating depth the next time I visit a specific combination.”
Bill, Editor of Rifleshooter.com, answered: “I have so many favorite reloading tools, it’s hard to pick one. But if I had to, it would be my Forster Co-Ax press. I like the ease [with which] you can change dies and that it doesn’t require traditional shell holders. It’s a great tool to have!”
Sierra Bullets Ballistic Technician Duane Siercks answered: “I don’t know that you would actually call this equipment, but the item that comes to mind would be my reloading room/shoot house. I had always had to squeeze everything into a corner or even an unheated shed. After we bought our current house, I built a garage and placed it so that I had a window looking down a 250-yard range. I built a dedicated room with heat and A/C. It contains my reloading bench and a shooting bench. The shooting bench lets me slide open the window and shoot down the range. It is very handy to not have to load everything up to go to the range. It also makes load development a lot simpler and efficient. I don’t know how I ever got along without it.
I also wonder what I did before I acquired the Lyman 1200 DPS Powder Dispenser. This has made the process so much simpler and much easier. I also have a Lee Precison Universal Decapping Die that I would gladly spend the money on again. This may be a small thing, but it certainly is handy. The Lee would accommodate some very large cases that some of the others were too small for.”
Jon Addis answered: “Putting an A&D FX-120i scale with AutoTrickler and Auto-Throw on the bench has changed the way I reload. It’s kernel accurate in about 15 seconds. Saves time and reduces a variable. And of course, the system is made better by the Area 419 Billet Adjustable base for the trickler and Billet Powder Cup.”
This video shows the AutoTrickler V2 and Auto-Throw Combo:
Sierra Bullets Chief Ballistician Tommy Todd answered: “A brass annealing machine and a RCBS Chargemaster complimented with a Sartorious scale.”
Sierra Bullets Ballistician Gary Prisendorf answered: “RCBS Rock Chucker Press, it’s built like a tank, and it will last me a lifetime.”
Sierra Bullets Production Manager Chris Hatfield also answered: “RCBS Rock Chucker single-stage reloading press.”
Jeremy Kisner answered: “My Giraud trimmer has taken [three operations] and combined them into one easy task. I can now size my brass and then sit down and trim, chamfer, and debur to a 0.001″ tolerance in one motion.”
Dan Blake answered: “My Annealing Made Perfect (AMP) annealer. With consistent neck tension being one of the largest contributions to small Extreme Spread on muzzle velocities, I believe this induction annealer is truly the best on the market.”
This manufacturer-produced video shows how the AMP annealing machine operates:
Trevor Aldinger answered: “Area 419 Master Funnel Kit. In the past I’ve used plastic funnels and even other metal ones. This system fits case necks and flows much better than any others I’ve used, and there is no static since it’s metal. We spend a lot of time and money to get precise charges, I don’t want to lose or miss a kernel because of a cheap funnel.”
Tyler Riley answered: “My RCBS bench primer (priming tool). It has a lot more leverage than a hand primer and still has a good feel to how tight primer pockets are. Makes it much easier on my hands to prime large runs, especially new brass with tight pockets.”
Craig Arnzen answered: “My Annealeez [annealing machine] is one of the best tools in my reloading room. Neck tension is SO important, and annealing every firing really helps with that. This is an inexpensive tool that can anneal a lot of cases at once, and help me produce more consistent ammo.”
Josh Temmen answered: “Time is critical for me so my RCBS Chargemasters are indispensable (pun intended.) They cut down on time at my reloading bench while maintaining the weight tolerances required for long range shooting.”
Josh Bartlett answered: “I have my Dillon 650 set up with Whidden floating tool heads to do decapping and sizing on my match ammo. The case feeder and progressive function of the press save me a TON of time when doing lots of several hundred rounds.”
Ryan Brandt answered: “… A quality set of calipers. My reloading room is full of very nice equipment but little does more to satisfy my perfectionism than a good check with the calipers.”
The NRA’s Women’s Wilderness Escape (WWE) program, in partnership with Leupold and Kristy Titus of Pursue the Wild, will offer a special ladies-only firearms training course next June in Central Oregon. This Leupold Academy Rifle & Pistol course will cover both rifles and pistols. The curriculum includes two days of scoped rifle instruction and one day of basic optical-sighted defensive pistol instruction. Leupold instructors will lead the course, teaching participants to master both firearm platforms. Kristy Titus, a skilled huntress and outdoor guide, will be in attendance to help mentor the participants.
This women’s-only event runs three days from June 3-7. It will be held outside Redmond in scenic Central Oregon. All women over 18 are welcome to attend. The $1,200 registration fee includes all firearms, ammunition, targets, classes, activities, ground transportation, lodging and most meals.
Along with this Leupold-directed event in Oregon, there will be three other WWE events in 2019.
NRA Women’s Wilderness Escape Program — All 2019 Offerings
The NRA Wilderness Escape program provides opportunities for women ages 18 and older of all different skills levels to explore and learn about shooting, hunting and the outdoors with skilled NRA-Certified Instructors and outdoor specialists.
For more information about NRA Women’s Wilderness Escape events or to register, visit WWE.NRA.org, call (800) 672-7435 option 5, or email wwe@nrahq.org.
Kristy Titus Offers Hunting Tips
As part of NRA Women TV, hunting guide Kristy Titus hosts a series of videos that explain important strategies and shooting skills for hunters. Titus is a certified instructor who has hunted around the globe. She grew up in the outdoors, running pack mules in Oregon with her father. In these videos, Kristy discusses demonstrates field positions that can be employed during a hunt. She also explains preparation for a hunt, including fitness training.
“When it comes to bolt-action rifle fit, there is no ‘one size fits all’,” says Titus. “When picking out your rifle [consider options] after the purchase to ensure you are as comfortable as possible.”
You’ve probably heard of cut-rifling, but did you know this process was invented in Germany nearly 500 years ago? Read on to learn more about how a cut-rifled barrel is made…
The cut-rifling process, used by leading barrel-makers such as Bartlein, Border, Brux, Krieger, and Obermeyer, can yield a very high-quality barrel with a long useful life. Cut-rifled barrels have been at the top in short- and long-range benchrest competition in recent years, and cut-rifled barrels have long been popular with F-Class and High Power shooters.
You may be surprised to learn that cut-rifling is probably the oldest method of rifling a barrel. Invented in Nuremberg around 1520, the cut-rifling technique creates spiral grooves in the barrel by removing steel using some form of cutter. In its traditional form, cut rifling may be described as a single-point cutting system using a “hook” cutter. The cutter rests in the cutter box, a hardened steel cylinder made so it will just fit the reamed barrel blank and which also contains the cutter raising mechanism.
Above is a computer animation of an older style, sine-bar cut-rifling machine. Some machine features have been simplified for the purposes of illustration, but the basic operation is correctly shown. No, the cut-rifling machines at Krieger don’t use a hand-crank, but the mechanical process shown in this video is very similar to the way cut-rifling is done with more modern machines.
Read About Cut-Rifling Process at Border-Barrels.com
To learn more about the barrel-making process, and cut-rifling in particular, visit FirearmsID.com. There you’ll find a “must-read” article by Dr. Geoffrey Kolbe: The Making of a Rifled Barrel. This article describes in detail how barrels are crafted, using both cut-rifling and button-rifling methods. Kolbe (past owner of Border Barrels) covers all the important processes: steel selection, hole drilling, hole reaming, and rifling (by various means). You’ll find a very extensive discussion of how rifling machines work. Here’s a short sample:
“At the start of World War Two, Pratt & Whitney developed a new, ‘B’ series of hydraulically-powered rifling machines, which were in fact two machines on the same bed. They weighed in at three tons and required the concrete floors now generally seen in workshops by this time. About two thousand were built to satisfy the new demand for rifle barrels, but many were broken up after the war or sold to emerging third world countries building up their own arms industry.
Very few of these hydraulic machines subsequently became available on the surplus market and now it is these machines which are sought after and used by barrel makers like John Krieger and ‘Boots’ Obermeyer. In fact, there are probably less of the ‘B’ series hydraulic riflers around today than of the older ‘Sine Bar’ universal riflers.
The techniques of cut rifling have not stood still since the end of the war though. Largely due to the efforts of Boots Obermeyer the design, manufacture and maintenance of the hook cutter and the cutter box have been refined and developed so that barrels of superb accuracy have come from his shop. Cut rifled barrel makers like John Krieger (Krieger Barrels), Mark Chanlyn (Rocky Mountain Rifle Works) and Cliff Labounty (Labounty Precision Reboring)… learned much of their art from Boots Obermeyer, as did I.” — Geoffrey Kolbe
Video find by Boyd Allen. Archive photos from Border-Barrels.com. In June 2013, Birmingham Gunmakers Ltd. acquired Border Barrels. Dr. Geoffrey Kolbe has set up a new company called BBT Ltd. which produces chamber reamers and other gunsmithing tools and gauges. (Thanks to L. Holland for the Kolbe update).
Holiday Greetings to Our Readers
Merry Christmas and Happy Holidays to all our readers and especially our 43,000+ Forum Members. This marks our 14th Christmas “in business”, and the site is stronger than ever thanks to our contributing Gold and Silver Forum members and industry sponsors. AccurateShooter.com is now accessed by over 500,000 visitors every month, who enjoy our Feature Articles, Daily Bulletin, Shooters’ Forum, and our Facebook Page. We added 5000 new Forum members this past year! Part of the reason for that success is the hard work of our dedicated staff and volunteer helpers.
Unsung Heroes Deserve Recognition
I want to acknowledge those guys who have really helped out the site. Number one is our Systems Admin, Jay Christopherson. Along with being a darn fine shooter, Jay is a computer guru who keeps the servers running smoothly. We acknowledge Boyd Allen and EdLongRange who supply story leads for the Daily Bulletin, as well as F-Class John, who prepares Deals of the Week. We also thank Jeff Williams, our “Answerman” who fields questions from our readers. We have a great place to test rifles thanks to our valued friend (and designated trigger-puller) Joe Friedrich. Special thanks go to: Ed Mobley and Steve Lawrence of 65Guys.com; Bill, Editor of Rifleshooter.com; Gavin Gear; and Erik Cortina. These folks have worked on important product tests, contributing stories and videos. I also want to recognize our regular contributors, including Craig Arnzen, Vince Bottomley, James Mock, John Whidden, and Glen Zediker. All these men (and many others) have all contributed much time and effort.
We also want to thank our major sponsors, without whose support the site could not provide the full AccurateShooter.com experience, with an active Forum, an archive of in-depth articles, and fresh content 365 days a year in our Daily Bulletin. We’re grateful to all our sponsors and advertisers. In particular, we want to acknowledge the major online retailers who have been strong supporters of this site for many years: Bruno Shooters Supply, Bullet Central, Graf & Sons, Grizzly Industrial, EuroOptic, Midsouth Shooters Supply, Powder Valley Inc., and Precision Reloading. Thanks also to major advertisers Capstone, Nosler, Precision HC Gear, Stocky’s Stocks, Whidden Gunworks, and Zeiss Optics. The continuing support of these companies, and ALL our sponsors, helps us serve our readers and Forum members.
Is your well-built rifle of high-quality components plagued with vertical fliers across more than 1-3 handload combinations? Consider the bedding, crown and scope/sight mounts. Are they correct? If so, then you might check for ignition issues before boldly undertaking an extensive, expensive, and quite possibly fruitless quest for the “magic handload”.
Sierra Bullets Ballistician Gary Prisendorf answered: “
Holiday Greetings to Our Readers
