|
|
June 3rd, 2015
Click Photo to read full test results in Target Shooter Magazine.
If you shoot a .308 Win, or any cartridge that uses a Large Rifle (LR) primer, you should read an important new article by Laurie Holland in Target Shooter Magazine. Holland, a talented shooter from the UK, tested no less than sixteen (16) different large primer types using a custom F-TR target rifle shot from the bench. Laurie loaded .308 Win ammo* with 16 LR primer varieties and then tested for average velocity, ES/SD, and group size. This may be the most comprehensive and thorough LR primer test ever done. Here are the primer types tested:
CBC Magtech 9½
CCI 200 LR
CCI BR2 Match
CCI 250 Magnum
Federal 210
Federal 210M Match
Federal 215M Magnum Match
Fiocchi Large Rifle |
Kynoch Large Rifle
Murom KVB-7 (PMC LR)
Norma Superflash LR
PMC LR Magnum
Remington 9½ LR
Remington 9½ M Magnum
Sellier & Bellot LR
Winchester WLR |
Test Rig: Osprey Rifles-built F-TR rifle with Savage PTA action, 32″ Bartlein 1:12″-twist ‘Heavy Palma’ barrel, and Dolphin Gun Company modular stock with an F-Open/Benchrest fore-end.
Some of Laurie’s results may surprise you. For example, would you guess that Sellier & Bellot primers had the lowest ES, by a significant margin? And get this, among ALL the primers tested, Rem 9½M Magnum primers produced the lowest velocity, while Rem 9½ LR (non-magnum) primers yielded the highest velocity. (The total velocity spread for all primers was 35 fps). That’s counter-intuitive and it’s odd that Rems were at opposite ends of the speed spectrum among ALL primers tested.
“The rationale for doing side-by-side tests is to see what effect primer choice has on ballistics, i.e. average velocities and MV consistency. There are a great many views on the subject, a few based on tests (including primer flame photography) but most apparently hearsay.” — Laurie Holland
Every serious hand-loader should definitely read the full test results to understand Laurie’s methodology and get all the details. This is an important test, with significant findings. But if you can’t spare the time right now, here are some highlights below:
Primer with Lowest Velocity: Remington 9½ M Magnum (2780 fps)
Primer with Highest Velocity: Remington 9½ LR (2815 fps)
Primer with Lowest ES/SD: Sellier & Bellot LR (12/3.1 fps)
Primer with Highest ES/SD: Remington 9½ M Magnum (47/14.0 fps)
Primer with Smallest Group Size: Remington 9½ LR (0.43″ average, three 5-shot groups)
Primer with Biggest Group Size: CBC Magtech 9½ (0.7″ average, three 5-shot groups)
Editor’s Comment: Laurie shot three, 5-shot groups at 100 yards with each primer type. The average group size for the top six primers varied by only 0.10″ (0.43″ to 0.53″), so one can’t conclude that one type is much better than another. Total group size variance (from best to worst) was 0.27″.
“The biggest surprise to me … came from an elderly (at least 10 years) lot of Czech Sellier & Bellot standard caps with an ES of 12 and SD of 3.1 fps, way below those of the nearest competitor. By contrast to the Fiocchis, they were an almost slack fit in the cases and this may have contributed to their consistent performance.” — Laurie Holland
NOTE: Values in chart are based on 15-Shot strings. The ES/SD numbers will therefore be higher than is typical with five-shot strings.
Testing 16 primer types was a huge task — we commend Laurie for his hard work and thoroughness. This extensive test is an important contribution to the “knowledge base” of precision shooting. Laurie’s findings will doubtless influence many hand-loaders who hope to produce more consistent ammunition, or achieve better accuracy. Credit should also be given to Target Shooter Magazine for publishing the results. Well done gentlemen…
*Reloading method for Test Ammo: “Test batches consisted of 16 or 17 rounds for each primer, charges thrown by an RCBS ChargeMaster and checked on lab-quality electronic scales, adjusted if necessary to within ± 0.04gn, so any charge weight variation would be under 0.1 grain which equates here to 5 fps.”
June 2nd, 2015
In the just-released June 2015 issue of Shooting Sports USA, you’ll find an excellent profile of SFC Emil Praslick III, a legendary figure in American shooting. As a marksmanship instructor and coach for the USAMU, Praslick has been a mentor for many of America’s greatest marksmen. Praslick has also served as a wind coach for many civilian teams over the years, guiding them to victory in high-level championship events. SFC Praslick plans to retire later this year, when SFC Shane Barnhart will take over as coach of the USAMU Service Rifle Team.
In a wide-ranging Shooting Sports USA interview with writer John Parker, SFC Praslick offers many interesting insights. Here are some highlights (after the jump):
May 30th, 2015
Some folks say you haven’t really mastered marksmanship unless you can hit a target when standing tall ‘on your own hind legs’. Of all the shooting positions, standing can be the most challenging because you have no horizontally-solid resting point for your forward arm/elbow. Here 10-time National High Power Champ Carl Bernosky explains how to make the standing shot.
Carl Bernosky is one of the greatest marksmen in history. A multi-time National High Power Champion, Carl has won ten (10) National High Power Championships in his storied shooting career, most recently in 2012. In this article, Carl provides step-by-step strategies to help High Power shooters improve their standing scores. When Carl talks about standing techniques, shooters should listen. Among his peers, Carl is regard as one of the best, if not the best standing shooter in the game today. Carl rarely puts pen to paper, but he was kind enough to share his techniques with AccurateShooter.com’s readers.
If you are position shooter, or aspire to be one some day, read this article word for word, and then read it again. We guarantee you’ll learn some techniques (and strategies) that can improve your shooting and boost your scores. This stuff is gold folks, read and learn…
 How to Shoot Standing
by Carl Bernosky
Shooting consistently good standing stages is a matter of getting rounds down range, with thoughtfully-executed goals. But first, your hold will determine the success you will have.
1. Your hold has to be 10 Ring to shoot 10s. This means that there should be a reasonable amount of time (enough to get a shot off) that your sights are within your best hold. No attention should be paid to the sights when they are not in the middle — that’s wasted energy. My best hold is within 5 seconds after I first look though my sights. I’m ready to shoot the shot at that time. If the gun doesn’t stop, I don’t shoot. I start over.
2. The shot has to be executed with the gun sitting still within your hold. If the gun is moving, it’s most likely moving out, and you’ve missed the best part of your hold.
3. Recognizing that the gun is sitting still and within your hold will initiate you firing the shot. Lots of dry fire or live fire training will help you acquire awareness of the gun sitting still. It’s not subconscious to me, but it’s close.
4. Don’t disturb the gun when you shoot the shot. That being said, I don’t believe in using ball or dummy rounds with the object of being surprised when the shot goes off. I consciously shoot every shot. Sometimes there is a mistake and I over-hold. But the more I train the less of these I get. If I get a dud round my gun will dip.* I don’t believe you can learn to ignore recoil. You must be consistent in your reaction to it.
 5. Know your hold and shoot within it. The best part of my hold is about 4 inches. When I get things rolling, I recognize a still gun within my hold and execute the shot. I train to do this every shot. Close 10s are acceptable. Mid-ring 10s are not. If my hold was 8 inches I would train the same way. Shoot the shot when it is still within the hold, and accept the occasional 9. But don’t accept the shots out of the hold.
6. Practice makes perfect. The number of rounds you put down range matter. I shudder to think the amount of rounds I’ve fired standing in my life, and it still takes a month of shooting standing before Perry to be in my comfort zone. That month before Perry I shoot about 2000 rounds standing, 22 shots at a time. It peaks me at just about the right time.
This summarizes what I believe it takes to shoot good standing stages. I hope it provides some insight, understanding, and a roadmap to your own success shooting standing.
— Good Shooting, Carl
* This is very noticeable to me when shooting pistol. I can shoot bullet holes at 25 yards, but if I’ve miscounted the rounds I’ve fired out of my magazine, my pistol will dip noticeably. So do the pistols of the best pistol shooters I’ve watched and shot with. One might call this a “jerk”, I call it “controlled aggressive execution”, executed consistently.
May 29th, 2015
 Sinclair International has released an interesting article about Case Concentricity* and bullet “run-out”. This instructional article by Bob Kohl explains the reasons brass can exhibit poor concentricity, and why high bullet run-out can be detrimental to accuracy.
Concentricity, Bullet Alignment, and Accuracy by Bob Kohl
The purpose of loading your own ammo is to minimize all the variables that can affect accuracy and can be controlled with proper and conscientious handloading. Concentricity and bullet run-out are important when you’re loading for accuracy. Ideally, it’s important to strive to make each round the same as the one before it and the one after it. It’s a simple issue of uniformity.
May 28th, 2015
This 2010 story is reprinted at readers’ request.
In the past few years, tubeguns have really taken over in high power circles. At many matches you’ll see more tubeguns than conventional prone rifles, and a high percentage of those tubeguns will have been built using an Eliseo (Competition Machine) CSS chassis kit.
Step-By-Step Guide to Stock Set-Up
If you are a new tubegun shooter, or if you are planning a tubegun build this winter, our friend “GS Arizona” has prepared a comprehensive set-up guide for Eliseo tubeguns. Eliseo’s CSS chassis system affords a myriad of adjustments. Initially, one can be overwhelmed by all the variables: Length of Pull, Length to Sights, Length to Handstop, Cheekpad Height, Buttstock Offset, Buttstock Cant Angle, Handstop Angle, and Forearm Rotation.
May 19th, 2015
“The overturning moment MW tends to rotate the bullet about an axis, which goes through the CG (center of gravity) and which is perpendicular to the plane of drag….
Ruprecht Nennstiel, a forensic ballistics expert from Wiesbaden, Germany, has authored a great resource about bullet behavior in flight. Nennstiel’s comprehensive article, How Do Bullets Fly, explains all the forces which affect bullet flight including gravity, wind, gyroscopic effects, aerodynamic drag, and lift. Nennstiel even explains the rather arcane Magnus Force and Coriolis Effect which come into play at long ranges. Nennstiel’s remarkable resource contains many useful illustrations plus new experimental observations of bullets fired from small arms, both at short and at long ranges.
Shadowgraph of .308 Winchester Bullet
A convenient index is provided so you can study each particular force in sequence. Writing with clear, precise prose, Nennstiel explains each key factor that affects external ballistics. For starters, we all know that bullets spin when launched from a rifled barrel. But Nennstiel explains in greater detail how this spinning creates gyroscopic stability:
May 14th, 2015
 If you have an interest in historic arms, or just enjoy a diversion from the world of precision centerfire rifles, muzzle-loaders can be fun. There are also many states where hunters with muzzle-loaders enjoy a longer (and/or earlier) hunting season.
If you want to learn more about muzzle-loaders, the NRA and the National Muzzleloading Rifle Association have created an excellent new book, the NRA How-To-Series on Muzzleloading. This 132-page handbook ($12.00) covers muzzleloading safety, fundamentals of muzzleloader shooting, black powder basics, shooting positions, cleaning, storage and more. The “how-to” guide covers rifle, pistol, and shotgun muzzle-loaders.
The How-To book is a good starter publication for anyone interested in muzzle-loaders. Along with the book, the NRA recommends that novices attend a muzzleloading course to learn safe shooting practices from qualified instructors.
May 6th, 2015
If you are considering purchasing a new optic for your favorite rifle, you should read a recent article by Robert Abrams that appears on the Target Shooter Magazine Website. Abrams, a Canadian shooter who runs the Rifletalk.org Blog, considers a wide spectrum of optics, from bargain-priced models to top-of-the-line scopes from Nightforce and Schmidt & Bender. In comparing optics, Abrams considers a variety of factors including: Optical Clarity, Controls Function, Cost, Reliability/Durability, and Warranty.
READ FULL SCOPE COMPARISON REVIEW HERE
Abrams leads off with this invaluable bit of advice: “I have owned a lot of scopes and the reason I’ve owned so many is because, like most people, I made the mistake of ‘false economy’ — initially buying cheap scopes. Today, I firmly believe the old adage ‘only a rich man can afford cheap glass’ and thought it was about time that I shared some of my observations about a few of the optics choices out there.” To prove his point (that buying cheap glass is ‘false economy’) Abrams reviews the full spectrum of optics, from low-end to high-end:
May 5th, 2015
This article is part of Sinclair Int’l Step-By-Step Reloading Series. Most of the products mentioned in this article are sold through Sinclair’s webstore.
by Roy Hill, Brownells/Sinclair Copywriter
Making your own precision handloads is a meticulous journey with many steps, many important matters to consider, and many sets of measurements to calculate. For those who pursue the perfect group, the highest score, the really long accurate shot, the rewards more than outweigh the effort. Choosing the right cases, deburring the flash holes, making the primer pockets uniform, trimming the cases, and lubricating them are all familiar – and critical – steps along the journey. And now that your brass preparation is complete, you are at last ready to start running the cases through your press and fill them with primers, powder, and bullets. The very first die the brass encounters is the sizing die. You insert the case, work the press’s lever to return the case to its correct pre-fired dimensions – and the journey continues.
May 4th, 2015
 
Building your own portable shooting bench is a great do-it-yourself project. You can build a sturdy bench for well under $100 in materials. Compare that to some deluxe factory-built benches which may cost $500.00 or more.
FREE Bench Plans on the Web
You’ll find a wide assortment of home-built shooting bench designs (both portable and fixed) on the internet. Renovation Headquarters has links to FREE Plans and building instructions for fourteen (14) different shooting benches. There are all-wood shooting bench designs as well as benches that combine a wood top with a metal sub-frame or legs.
CLICK HERE for Shooting Bench FREE Plans.
|
