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post #1 of 28 (permalink) Old 11-30-2010, 01:26 PM Thread Starter
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The Lifespan of a Gun Barrel Is about Six Seconds

http://bulletin.accurateshooter.com/...s-barrel-life/

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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.

Stopwatch barrel life

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.
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post #2 of 28 (permalink) Old 11-30-2010, 02:43 PM
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post #3 of 28 (permalink) Old 11-30-2010, 02:44 PM
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post #4 of 28 (permalink) Old 11-30-2010, 02:56 PM
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Jesus, 3000 rounds is all my barrel is good for? I'm going to need about a dozen just to deal with the amount of zombies in my hometown after the zombie-apocalypse.

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post #5 of 28 (permalink) Old 11-30-2010, 03:08 PM
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This isnt true. I've had well over 3000 loads through my barrel and I'm still pulling MOF accuracy

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post #6 of 28 (permalink) Old 11-30-2010, 03:08 PM
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post #7 of 28 (permalink) Old 11-30-2010, 03:20 PM
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Quote:
Originally Posted by Ofc. Ponch View Post
I've had well over 3000 loads through my barrel
yeah, I bet you have.

Chris
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post #8 of 28 (permalink) Old 11-30-2010, 03:25 PM
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yeah, I bet you have.
I've had my fair share of trips to the range by myself!

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post #9 of 28 (permalink) Old 11-30-2010, 03:43 PM
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post #10 of 28 (permalink) Old 11-30-2010, 03:59 PM
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does that mean my penis only has a life span of about an hour?

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post #11 of 28 (permalink) Old 11-30-2010, 04:09 PM Thread Starter
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does that mean my penis only has a life span of about an hour?
More importantly, it means that you wore it out back when you were 12.
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post #12 of 28 (permalink) Old 11-30-2010, 04:18 PM
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More importantly, it means that you wore it out back when you were 12.
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post #13 of 28 (permalink) Old 11-30-2010, 04:43 PM
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Quote:
Originally Posted by Ofc. Ponch View Post
This isnt true. I've had well over 3000 loads through my barrel and I'm still pulling MOF accuracy

+1 experience has told me differently, besides I don't need that kind of accuracy any longer. I hunt deer and elk (now) all I need to do is and 8" circle at 200 yards.

Sometimes goodbye is your second chance.
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post #14 of 28 (permalink) Old 11-30-2010, 04:45 PM
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Originally Posted by MoparBoyy View Post
does that mean my penis only has a life span of about an hour?
A reliable source tells me you suffer from AD.

Sometimes goodbye is your second chance.
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post #15 of 28 (permalink) Old 11-30-2010, 05:17 PM Thread Starter
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Originally Posted by RickC1957 View Post
A reliable source tells me you suffer from AD.
C'mon, you know better... there are NEVER Accidental Discharges... only Negligent Discharges!

Ew...
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post #16 of 28 (permalink) Old 12-02-2010, 12:35 AM
 
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So what is the ruger 10/22?

I bought the gun when I was 15 and have way more than 20,000 rounds through a single barrel and I still pick heads off golphers at 30 yards?
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post #17 of 28 (permalink) Old 12-02-2010, 02:12 AM
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Math is a motherfucker.

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post #18 of 28 (permalink) Old 12-03-2010, 09:55 PM
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I did the math for a 9mm pistol I used 1,300 ft/s and a 4.7" Barrel length

If i did my math right 3000 rounds is equivalent to just over 1.8 seconds

I didn't double check yet, but my wife told me to stop wasting time on a stupid math problem no one cares about and come to bed....

Baseballdz (5:14:48 PM): i went to take a piss at about midnight and all i hear is bed springs going nuts and teresa squeeling like a fucking pig
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post #19 of 28 (permalink) Old 12-03-2010, 11:42 PM
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FYI guys, in case you didnt kow.

Thsi doesnt mean your barrel is useless. This only means that the accuracy will be effected to a noticable degree.

A match barrel could possibly go from .50"MOA to 1.0"-1.5"MOA at this round count were as a plain jane barrel will open up from 2.0" MOA to 3.5"-4"MOA. Still very capable degrees of accuracy though when put into perspective.

To be completely useless you would have to just about completely wear out the rifling or burn out the chamber.

The higher pressure rounds teh faster the chamber could be burned out. I've seen .308 with in excess of 8K rounds still shooting sub 2" groups @ 100 yards

A .338 lapua barrel will loose it's sub MOA accuracy in about 2K rounds

A 9mm pistol would propbaly have frame failure well b4 the barrel burns out.

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post #20 of 28 (permalink) Old 12-04-2010, 12:17 AM
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Quote:
Originally Posted by Red96 View Post
I did the math for a 9mm pistol I used 1,300 ft/s and a 4.7" Barrel length

If i did my math right 3000 rounds is equivalent to just over 1.8 seconds

I didn't double check yet, but my wife told me to stop wasting time on a stupid math problem no one cares about and come to bed....
but youre not accounting for acceleration, the bullet doesnt instantly travel 1300ft/s

-Jason
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post #21 of 28 (permalink) Old 12-04-2010, 10:38 AM
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Quote:
Originally Posted by Pilotx1 View Post
but youre not accounting for acceleration, the bullet doesnt instantly travel 1300ft/s
Well I assumed constant acceleration, as did the original article.

Baseballdz (5:14:48 PM): i went to take a piss at about midnight and all i hear is bed springs going nuts and teresa squeeling like a fucking pig

Last edited by Red96; 12-04-2010 at 11:49 AM.
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post #22 of 28 (permalink) Old 12-05-2010, 12:26 AM
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Well I assumed constant acceleration, as did the original article.
When i hear constant acceleration, i'd figure that they mean the acceleration rate is constant, meaning the velocity is accelerating at a constant rate.
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post #23 of 28 (permalink) Old 12-05-2010, 11:03 AM
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When i hear constant acceleration, i'd figure that they mean the acceleration rate is constant, meaning the velocity is accelerating at a constant rate.
Right...the acceleration was something like 2.15 million ft/s^2 if I remember correctly. Did anyone else crunch the numbers and get a different result?

If you do some quick math assuming I was an idiot:

1/(1300 ft/s ) x .3916 ft x 3000 rounds = ~.9 seconds.....which is not what I figured a few posts ago. Maybe the gun forum isn't the best place to argue about basic equations of motion and physics, oh well.

Baseballdz (5:14:48 PM): i went to take a piss at about midnight and all i hear is bed springs going nuts and teresa squeeling like a fucking pig
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post #24 of 28 (permalink) Old 12-05-2010, 04:36 PM
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Doing that math, yes you get about .9 seconds. But that is assuming that the bullet is traveling at 1300 ft/s for the full 4.7".
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post #25 of 28 (permalink) Old 12-05-2010, 04:40 PM
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Quote:
Originally Posted by Heartlesspinto View Post
Doing that math, yes you get about .9 seconds. But that is assuming that the bullet is traveling at 1300 ft/s for the full 4.7".

ugh....nevermind....

Baseballdz (5:14:48 PM): i went to take a piss at about midnight and all i hear is bed springs going nuts and teresa squeeling like a fucking pig
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post #26 of 28 (permalink) Old 12-05-2010, 04:41 PM
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Quote:
Originally Posted by Red96 View Post
Right...the acceleration was something like 2.15 million ft/s^2 if I remember correctly. Did anyone else crunch the numbers and get a different result?

If you do some quick math assuming I was an idiot:

1/(1300 ft/s ) x .3916 ft x 3000 rounds = ~.9 seconds.....which is not what I figured a few posts ago. Maybe the gun forum isn't the best place to argue about basic equations of motion and physics, oh well.
I guess it's assumed I'm an idiot

Baseballdz (5:14:48 PM): i went to take a piss at about midnight and all i hear is bed springs going nuts and teresa squeeling like a fucking pig
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post #27 of 28 (permalink) Old 12-05-2010, 06:32 PM
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Quote:
Originally Posted by Red96 View Post
Right...the acceleration was something like 2.15 million ft/s^2 if I remember correctly. Did anyone else crunch the numbers and get a different result?

If you do some quick math assuming I was an idiot:

1/(1300 ft/s ) x .3916 ft x 3000 rounds = ~.9 seconds.....which is not what I figured a few posts ago. Maybe the gun forum isn't the best place to argue about basic equations of motion and physics, oh well.
Gotcha
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post #28 of 28 (permalink) Old 12-05-2010, 11:45 PM
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Quote:
Originally Posted by Heartlesspinto View Post
Gotcha

Baseballdz (5:14:48 PM): i went to take a piss at about midnight and all i hear is bed springs going nuts and teresa squeeling like a fucking pig
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