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July 13th, 2022

Gone in SIX Seconds — The Brutal Truth of Short Barrel Life

Stopwatch barrel life

This thought-provoking article has been one of the most popular Daily Bulletin features in recent years. We are republishing this story today for readers who may have missed it the first time around…

Here’s a little known fact that may startle most readers, even experienced gunsmiths: your barrel wears out in a matter of seconds. The useful life of a typical match barrel, in terms of actual bullet-in-barrel time, is only a few seconds. How can that be, you ask? Well you need to look at the actual time that bullets spend traveling through the bore during the barrel’s useful life. (Hint: it’s not very long).

Bullet-Time-in-Barrel Calculations
If a bullet flies at 3000 fps, it will pass through a 24″ (two-foot) barrel in 1/1500th of a second. If you have a useful barrel life of 3000 rounds, that would translate to just two seconds of actual bullet-in-barrel operating time.

Ah, but it’s not that simple. Your bullet starts at zero velocity and then accelerates as it passes through the bore, so the projectile’s average velocity is not the same as the 3000 fps muzzle velocity. So how long does a centerfire bullet (with 3000 fps MV) typically stay in the bore? The answer is about .002 seconds. This number was calculated by Varmint Al, who is a really smart engineer dude who worked at the Lawrence Livermore Laboratory, a government think tank that develops neutron bombs, fusion reactors and other simple stuff.

On his Barrel Tuner page, Varmint Al figured out that the amount of time a bullet spends in a barrel during firing is under .002 seconds. Al writes: “The approximate time that it takes a 3300 fps muzzle velocity bullet to exit the barrel, assuming a constant acceleration, is 0.0011 seconds. Actual exit times would be longer since the bullet is not under constant acceleration.”

We’ll use the .002 number for our calculations here, knowing that the exact number depends on barrel length and muzzle velocity. But .002 is a good average that errs, if anything, on the side of more barrel operating life rather than less.

So, if a bullet spends .002 seconds in the barrel during each shot, and you get 3000 rounds of accurate barrel life, how much actual firing time does the barrel deliver before it loses accuracy? That’s simple math: 3000 x .002 seconds = 6 seconds.

Stopwatch barrel lifeGone in Six Seconds. Want to Cry Now?
Six seconds. That’s how long your barrel actually functions (in terms of bullet-in-barrel shot time) before it “goes south”. Yes, we know some barrels last longer than 3000 rounds. On the other hand, plenty of .243 Win and 6.5-284 barrels lose accuracy in 1500 rounds or less. If your barrel loses accuracy at the 1500-round mark, then it only worked for three seconds! Of course, if you are shooting a “long-lived” .308 Win that goes 5000 rounds before losing accuracy, then you get a whopping TEN seconds of barrel life. Anyway you look at it, a rifle barrel has very little longevity, when you consider actual firing time.

People already lament the high cost of replacing barrels. Now that you know how short-lived barrels really are, you can complain even louder. Of course our analysis does give you even more of an excuse to buy a nice new Bartlein, Krieger, Shilen etc. barrel for that fine rifle of yours.

Permalink Bullets, Brass, Ammo, Gunsmithing, Tech Tip 1 Comment »
July 13th, 2022

Fitness Training Methods for Older Shooters

conditioning fitness training older shooters

The following article by Tom Alves describes a very practical approach to physical training for those of us who are not as young and spry as we once were. Tom shows us how to give our bodies at least some of the maintenance we give our rifles. While we all realize that our rifles will outlive us, let’s see if we can’t narrow the margin a bit with some personal maintenance that just might help the shooting too!

This article originally appeared in German Salazar’s Rifleman’s Journal, and appears with permission. Sadly, German passed away last month. This was a very sad loss of a great, triple-distinguished shooter and a great shooting sports writer.

A Suggested Training Approach for Older Shooters

By Tom Alves
conditioning fitness training older shootersMost articles and discussions regarding competitive shooting center around equipment. Now and then one will come across an article about physical training such as the USAMU piece on Physical Conditioning for Highpower Shooting. If you break the articles down they often discuss “core strength” and durability. The purpose of this paper is to elaborate on those points with a bit different perspective. Many of the articles you will read in books about position shooting and the one mentioned before are directed more toward the younger generation of shooters in their 20s. If you look down the line at a typical high power match these days you are likely to see quite a few folks who are in their middle 30’s and up. Many people in that age range have had broken bones and wear and tear on their joints so a training program needs to take that into account. For instance, while jogging for an extended period for heart and lung conditioning — often called cardio exercises — may be the recommended approach for younger folks, it may be totally inappropriate for older people. The procedure to repair meniscus tears in knees is one of the most frequently performed operations in this country. Another approach one often sees in training to improve core strength is the use of weight machines which isolate certain muscle groups in their operation. I would like to suggest an alternative approach that not only does not require special equipment but uses the body’s muscles in a coordinated fashion in the same way they are used in our natural movements. So, let’s set down some criteria:

1. The approach has to be low impact to conserve joints.

2. One goal is to improve the strength of the core muscles which are the muscles of our trunk that keep us erect and from where all movements initiate.

3. Along with core strength we need flexibility and full range of motion.

4. We want to improve our lung and heart function so we can have a good flow of oxygen going to our organs and muscles to reduce the rate at which we become fatigued during a competitive event.

Before I continue I believe it is appropriate for the reader to understand that I am a fellow shooter and this is a program I have designed for myself based on considerable reading and experience over a number of years. I am not a medical doctor, a formally trained exercise professional or any other type of specialist in the field. Consequently, this information is offered with the advice that you consult your medical advisor or similar authority before you embark on this or any similar regimen.

I will start with core strength and flexibility. Pilates exercises are resistance exercises that can incorporate the use of resistance bands, light weights and the weight of your body parts in order to strengthen the muscles in the abdomen, back, hips, chest and shoulders. The exercises can be performed alone but I recommend attending classes put on by a certified instructor who will ensure that you perform a balanced routine meaning you work on the front and back and both sides of your trunk. As to flexibility, yoga complements Pilates exercises and they are often taught together. In practical terms yoga strengthens through resistance using the weight of the body and increases flexibility by stretching the various muscle groups in a coordinated fashion. Some yoga exercises also work on balance which is helpful in position shooting and life in general. Again, I suggest attending formal yoga classes since an instructor can help you address such things as a joint misalignment. As an example, my right leg healed improperly after the femur was broken and my right foot splays out putting undue load on my left knee. There are a number of books available on Pilates and yoga and some of them get pretty involved; I leave that to the reader to explore. I will list some reference material at the end of the article that I have found useful.

Finally, heart and lung improvement. In order to exercise the heart and lungs while not abusing the joints, particularly the knees and hips, one has to resort to something other than jogging. Walking, bicycling, elliptical machines and swimming may be alternative methods you’d like to consider. Based on my reading, in order to get the most benefit it is important to exercise so that the pulse rate becomes elevated for periods of time rather than kept at a constant rate. The process I use, called PACE, is promoted by Al Sears, MD, http://www.alsearsmd.com/. It is interval training for the non-athlete. In simple terms one exercises, using whatever equipment one desires, to achieve a heart rate in which you are slightly above your ability to bring enough oxygen into your body to sustain the activity for an extended period. This is similar to wind sprints for a sprinter or a football player. After each episode you must rest until you have achieved recovery, meaning you can catch your breath easily. A series of three sets is recommended which covers a total time of about 20 minutes.

Report from the Author — Yes, Training Helps
As a result of this training program I have experienced increased strength in my legs and trunk, less joint stiffness, lower blood pressure, and lower resting pulse rate. The Pilates/yoga classes are usually attended 2 to 3 times a week and the interval training performed twice a week. [The author was 64 when this was first published. He is now 75, and still shooting Palma and Smallbore prone.]

conditioning fitness training older shooters

Before I close I would like to touch briefly on two other related subjects: hydration and visual training. When one is exerting oneself, the body produces perspiration to keep the body’s temperature at an acceptable level. As one perspires the blood gets thicker and the ocular fluid in one’s eyes thickens as well. The heart has to work harder to supply oxygen and nutrients to the body so visual and cognitive functions degrade and fatigue sets in rapidly. Essential chemicals called electrolytes are also carried out of the body with the perspiration. As a result, it is necessary to replace moisture and electrolytes to maintain basic health and a competitive level of performance. If one goes on the Internet there is a multitude of articles on hydration. Due to the kindness of my lead Pilates/yoga instructor, Ms. Annette Garrison, I have a pretty comprehensive article on various aspects of hydration that I have included, http://www.ideafit.com/fitness-library/hyponatremia-other-side-hydration-story , for your information.

conditioning fitness training older shootersLast I want to mention visual performance training. The New Position Rifle Shooting, A How-To Guide for Shooters and Coaches by Bill Pullum and Frank Hanenkrat mentions sports vision training amongst other aspects of vision in competitive shooting. If one goes on the Internet you will find training programs directed at golfers, baseball and football players. There is one site that has a demo which, if one looks at it for long, it is obviously very similar to a shooting gallery video game. The training involves rapid recognition and hand-eye coordination. Another source of visual training exercises, along with a wealth of other information, is the book Prone And Long Range Rifle Shooting by Nancy Tompkins.

Hopefully, I have provided some information which will be helpful in improving shooting performance and extending the time you can participate at a competitive level. It is important that you proceed at your own pace. I have pushed myself too hard in the interval training and now have to back off a bit. In closing I would like to thank Annette Garrison and GS Arizona for their help, patience and encouragement.

Additional Reference Material

1. Framework by Nicholas A. DiNubile, MD
This is required reading for anybody who has suffered an injury like a torn meniscus or has muscular skeletal issues. This is the book that led me to Pilates/yoga

2 P.A.C.E., The Twelve Minute Fitness Revolution by Al Sears, MD
The approach I use to interval training. I am sure there are other sources.

3. Physical Conditioning For Highpower Shooting by SGT Walter E. Craig, USAMU

4. Rifle, Steps To Success by Launi Meili

Permalink - Articles, Competition, Shooting Skills 2 Comments »
July 13th, 2022

Brownells PrimeTime Blowout Sale July 11-15

Brownells prime time primetime blowout sale july 2022

Brownells is running a major promotion this week from July 11 through July 15. During this Brownells PrimeTime Blowout Sale, there are significant savings (up to 50% off) on popular products. Brownells will unveil new deals every day during the PrimeTime Blowout Sale giving customers many chances for a great buy on that special something they’ve been waiting for.

Shoppers who visit Brownells.com through July 15 at 11:59 pm will find many products discounted steeply – some 50% off retail – from well-known names such as Colt, Hornady, Magpul, Law Tactical, Foxtrot Mike, Aero and many others. Want updates on the latest deals? Customers can receive instant notifications about exclusive deals by texting the word PRIME to 556223. You can also visit www.Brownells.com to see exclusive discount codes or sign up for email alerts.

Here are some current Brownells Discount Codes:

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Brownells prime time primetime blowout sale july 2022

Permalink Gear Review, Hot Deals, News No Comments »