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A typical rifle barrel is worn out in 5-10 seconds of use

This is a discussion on A typical rifle barrel is worn out in 5-10 seconds of use within the Accuracy forums, part of the M14 M1A Forum category; Very interesting. http://bulletin.accurateshooter.com/...fe-of-barrels/...


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Old March 1st, 2017, 08:48 PM   #1
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A typical rifle barrel is worn out in 5-10 seconds of use

Very interesting.

http://bulletin.accurateshooter.com/...fe-of-barrels/

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Old March 1st, 2017, 09:18 PM   #2
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That's fascinating stuff, thanks. Never thought about it that way.
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Old March 1st, 2017, 09:28 PM   #3
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That's fascinating stuff, thanks. Never thought about it that way.
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Me neither!

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Old March 1st, 2017, 09:50 PM   #4
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wow, I too, never thought about that. That's funny since barrels cost so much. A krieger barrel works out to $37 a second

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Old March 1st, 2017, 09:52 PM   #5
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Article says a .308 barrel is often good for 5000 rounds. At 168 grain per round, that comes out to 120 pounds of bullets doing down the barrel in 10 seconds. That is a lot lead to shove through that little hole in ten seconds!

Weird way to look at it. But it is interesting. Maybe you guys that reload can calculate how many pounds of powder goes off in that 10 seconds to do the shoving.

A grain is equal to 0.000142857 pounds. Multiply that by your load times 5000.

Hmmm. That has got to be a pretty big bang!

Kind of reminds me of what my engineer dad used to explain. If a Cadillac got 15 miles to the gallon, you could theoretically shoot it out of a cannon with one gallon of gas as the propellant and it would go 15 miles. That is the amount of power in one gallon of gas. And it does not matter if it pushes the car down the road at 35 mph for 15 miles, or launches it from a cannon. The work is the same to get the car from here to there. (Of course there are other efficiency issues and dynamics involved, be we are talking 'Theoretical' here.)

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Old March 1st, 2017, 10:15 PM   #6
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A typical rifle barrel is worn out in 5-10 seconds of use
story of my life

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Old March 1st, 2017, 11:43 PM   #7
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Article is basically telling the reader that accurate barrel life is equivalent to time the bore see the bullets travelling through it as another method of determining accurate barrel life, but expressed in time versus number of rounds. Such studies were conducted many years ago by the German arms mfg.'s for the Mauser Model 98 or it's variants. When I say many years ago, referring to a time period of pre WW I. Similar studies conducted on the various artillery weapons and barrel life, accuracy, etc. Actually Napoleon was a student of ballistics and known as an excellent mathematician which brought him to the attention of "superior officers" for his skill in directing fire and artillery deployment in battles. Good article and makes one think, but it hurts my head to think very much.

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Old March 1st, 2017, 11:48 PM   #8
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Top fuel drag engines only last about 750 revolutions. One pass then the rebuild.

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Old March 2nd, 2017, 05:31 AM   #9
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Fun fact of the day thank you!

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Old March 2nd, 2017, 05:52 AM   #10
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Stamper: error in your math. 1 lb = 7000 grains

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Old March 2nd, 2017, 05:57 AM   #11
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Stamper: error in your math. 1 lb = 7000 grains
You are both correct.....

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Old March 2nd, 2017, 07:03 AM   #12
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Given the flame temperature of almost 6000 degrees F in the barrel, it's not surprising.

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Old March 2nd, 2017, 07:15 AM   #13
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Quote:
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Stamper: error in your math. 1 lb = 7000 grains
1 divided by 7000 is 0.000142857.

We are saying the same thing. There is no error. Unless you want to extend the accuracy a few more decimals. Then the number is 0.00014285714286.

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Old March 2nd, 2017, 07:20 AM   #14
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Other engineering questions related to this topic:

How long is a 30 caliber 120 pound projectile? Maybe about 170 feet?

How large is the case to hold the powder of 5000 rounds?

How big a chamber is needed to hold the case and the 120 pound bullet?

And when in fires and pushes that bullet out the barrel in 10 seconds the barrel is worn out. And you still don't have it zeroed!

Just some fun thoughts.

I would rather shoot 5000 rounds separately, though. And THEN replace the barrel.

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Old March 2nd, 2017, 07:22 AM   #15
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Had a guy tell me, "I bought a used Crown Victoria for $8,500. That's only $2.05 per pound!"

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