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View Full Version : Never saw it this way!

patriot45
11-30-2010, 11:55 PM
This is the gun forum too, right!

The Life span of a gun barrel is about 6 seconds!

Sure, that Mosin-Nagant rifle in the back of your closet may date back to 1938, but the total time in which bullets have traveled down its bore is actually very brief. Assuming the usage of 3,000 rounds, a gun barrel lasts about six seconds before it’s worn out:

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.[...]

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.

megimoo
12-01-2010, 12:16 AM
[QUOTE=patriot45;339741]This is the gun forum too, right!

Those actual old time Western gun fights were a good example of that.After a lifetime using the same handgun the drunken cowboy gunfighters would empty the gun without hitting the other critter.As they drew closer to each other they would reload and try again.There was so much smoke they could barley see each other.
When one was finally hit the other critter if not hit himself staggered back to the bar.

patriot45
12-01-2010, 12:21 AM
[QUOTE=patriot45;339741]This is the gun forum too, right!

Those actual old time Western gun fights were a good example of that.After a lifetime using the same handgun the drunken cowboy gunfighters would empty the gun without hitting the other critter.As they drew closer to each other they would reload and try again.There was so much smoke they could barley see each other.
When one was finally hit the other critter if not hit himself staggered back to the bar.

That just shows to go you!

Gingersnap
12-01-2010, 10:41 AM
Interesting. I wonder what the ratio of cleaning time to firing time is? Probably 10,000 to 1 or something. :D

AmPat
12-01-2010, 07:27 PM
Using the same calculations for sex, the average ......................................:confused: