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akroxy Rookie Member
Joined: Aug 28, 2005 Posts: 18
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Posted: Sun Oct 09, 2005 10:25 am Post subject: Thoat errosion |
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Hey all,
What makes the thoat of a chamber errode? Can you prevent it? I've noticed that the COL for an established load in my 300 WM is stretching. It hasn't gone past my magazine length but darn close. I use a Stone Point OAL comparator to determine COL - I feel it is accurate. What are you guys thoughts.
later, D
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DallanC Site Admin
Joined: Jan 18, 2005 Posts: 3572 Location: Utah
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Posted: Sun Oct 09, 2005 11:30 am Post subject: Re: Thoat errosion |
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IMO its heat + friction. That end of the barrel stays hotter longer so it has more time to heat up the lands...
-DallanC
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11391 Location: Ava, Missouri
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Posted: Sun Oct 09, 2005 12:04 pm Post subject: Re: Thoat errosion |
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Yup...You can eliminate throat erosion by not firing your firearm. Erosion is caused by hot gasses passing the throat of the chamber. Somewhat like a cutting torch. The hotter the round the faster erosion will occur. It's very noticable on revolvers that have had lots of hot loads fired through them...
_________________ I have one nerve left and yer standin' on it...
DEMOCRACY Two wolves and one sheep voting on what to have for lunch...
LIBERTY A well armed sheep contesting the outcome of the vote... |
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515034s10ring Super Member
Joined: Sep 08, 2005 Posts: 1153 Location: Working my way back up and around
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waumo Member
Joined: Oct 05, 2005 Posts: 30
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11391 Location: Ava, Missouri
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GroovyJack Member
Joined: May 21, 2005 Posts: 621 Location: Bama
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Posted: Mon Oct 10, 2005 6:44 pm Post subject: Re: Thoat errosion |
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Another thing that helps reduce throat erosion , especially in the big Wby cases that are overbore , is not firing three or four rapid shots .. Keep the barrel as cool as practical ...
Jack
_________________ My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am |
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Shomebigbores Member
Joined: Dec 14, 2005 Posts: 77 Location: Arizona
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Posted: Thu Dec 15, 2005 7:26 pm Post subject: Re: Thoat errosion |
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Does this mean I have to stop driving my car because if I do it will eventually wear out.
Hey guys, we like em, we bought em, let's have fun with em and when they wear out buy two to replace one.
Just a poor boys opine.
Walt
_________________ One ought never to turn one's back on a threatened danger and try to run away from it. If you do that, you will double the danger. But if you meet it promptly and without flinching, you will reduce the danger by half.
Sir Winston Churchill |
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11391 Location: Ava, Missouri
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Posted: Thu Dec 15, 2005 7:54 pm Post subject: Re: Thoat errosion |
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Hey Walt...When you wear one out and buy two more...Buy me one too...
Just another poor boys opine...
_________________ I have one nerve left and yer standin' on it...
DEMOCRACY Two wolves and one sheep voting on what to have for lunch...
LIBERTY A well armed sheep contesting the outcome of the vote... |
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1895ss Super Member
Joined: Jul 21, 2005 Posts: 2612 Location: Not Here...!!
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Posted: Thu Dec 15, 2005 8:45 pm Post subject: Re: Thoat errosion |
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_________________ A cruel truth is much more desirable than a really nice lie.
'Tis far better to walk alone than to follow a crowd or an a**hole going the wrong way. |
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GroovyJack Member
Joined: May 21, 2005 Posts: 621 Location: Bama
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Posted: Thu Dec 15, 2005 8:48 pm Post subject: Re: Thoat errosion |
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he dunno how much throat erosion , he'd probly bonk hisself on his lit'l punkin' head on the rebound
Jack
_________________ My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am |
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JO422 Member
Joined: Sep 16, 2005 Posts: 33
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Posted: Thu Dec 15, 2005 8:58 pm Post subject: Re: Thoat errosion |
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Heat from the gasses coming out of the round cause throat erosion. Some rounds have a relatively long barrel life because of the caliber and the amount of powder. For example the .308 win has a relatively long barrel life because it is .30 cal, it uses a relatively small case and it pushes the bullet out at moderate velocity and pressures. On the other hand the .243 Win, which uses the same case as the .308, generally has a significantly shorter barrel life than the .308. This is because it is smaller caliber and this smaller diameter causes the same amount of gas to push through a smaller hole, and becasue of the higher velocity of the bullet . The .300 WM you have will erode the throat becasue of the large amount of powder that you are burning to push the bullet down the barrel. As far as I know the only way that you can decrease the throat erosion in yor rifle is to use lighter loads.
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11391 Location: Ava, Missouri
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Posted: Thu Dec 15, 2005 8:59 pm Post subject: Re: Thoat errosion |
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Thanks 1895ss
Thanks GroovyJack
A "Jack Handle" is the name a friend of mine used for one of my rifles until he witnessed the three holes in a neat triangle in a three inch dot at 100 yards. It was my Winchester Mod 94 .30-30 circa 1949...Loaded using Remington cases, 32 grains of W-748, 170 grain Speer FN and a CCI-200 primer. That is my favorite deer and pig round..."Jack Handle" indeed.....
_________________ I have one nerve left and yer standin' on it...
DEMOCRACY Two wolves and one sheep voting on what to have for lunch...
LIBERTY A well armed sheep contesting the outcome of the vote... |
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11391 Location: Ava, Missouri
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Posted: Thu Dec 15, 2005 9:07 pm Post subject: Re: Thoat errosion |
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Oh rats...That means that my 22-250 barrel of 25 years is worn out already...And I thoutht it might last a couple of years more...
Just spoofin' ya JO422. And welcome to this site in case no one has welcomed you yet...
_________________ I have one nerve left and yer standin' on it...
DEMOCRACY Two wolves and one sheep voting on what to have for lunch...
LIBERTY A well armed sheep contesting the outcome of the vote... |
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DallanC Site Admin
Joined: Jan 18, 2005 Posts: 3572 Location: Utah
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Posted: Thu Dec 15, 2005 9:15 pm Post subject: Re: Thoat errosion |
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Another note is any load exceeding 60,000 cup will etch a barrel very fast because at that pressure steel melts.
-DallanC
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