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New take on annealing. |
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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Posted: July/29/2011 at 11:21 |
My understanding, and from what I read, is that in order to anneal cases one needs to do the following:
Heat only the neck of the case evenly to about 320 deg Centigrade(608 F), then quickly cool off. The quick cooling off anneals the brass. On one of our local websites the following is said: (by someone that can shoot liitle groups at long distances) Heat the brass to 260 deg Centigrade (500F), then to 420 deg centigrade(788F) for 4-5 sec. From here the brass must be left to cool slowly. Dumping it in water serves no purpose in the annealing other then to prevent the heat spreading to the web or primer pocket. If not heated to 420 deg centigrade then the brass must be kept at 260 deg centigrade(500F) for 1 hour. Only then will it be annealed. Anyone care to pitch in?? Sounds wrong to me.
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SVT_Tactical
MODERATOR Chief Sackscratch Joined: December/17/2009 Location: NorthCackalacky Status: Offline Points: 31233 |
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Changes start to occur in brass grain structure at 480 degrees fahrenheit. To properly anneal brass, the temperature needs to be at 650 degrees F. for several minutes--BUT this will transfer too-much heat to the lower case in that time. So we need more heat for a shorter time. We need to raise the neck temp to about 750 degrees F. only for a few seconds to anneal. ***From a site selling anneling machines***Edited by SVT_Tactical - July/29/2011 at 11:27 |
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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I learned how to anneal from Vern Harrison of Central Virginia tactical. A phone calls and several PMs he got me set up. He really knows his stuff when it comes to precision shooting.
I actually bought the Hornady annealing kit because it has the holders that chuck right into a drill. I stole this from a post he did a while back.
He says in another post it is extremely important to cool the brass at the same temp. It is important to heat it up in a controlled equal manner from piece to piece and cooling it down the exact same is just as important. |
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3_tens
Optics Jedi Master Joined: January/08/2007 Location: Oklahoma Status: Offline Points: 7853 |
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Folks ain't got a sense of humor no more. They don't laugh they just get sore.
Need to follow the rules. Just hard to determine which set of rules to follow Now the rules have changed again. |
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BeltFed
Optics Retard Joined: February/12/2008 Location: Ky Status: Offline Points: 22268 |
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Annealing on a machine seems like the only way to go to keep it uniform, and consistant. That's why I don't fool with annealing.
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Life's concerns should be about the 120lb pack your trying to get to the top of the mountain, and not the rock in your boot.
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BeltFed
Optics Retard Joined: February/12/2008 Location: Ky Status: Offline Points: 22268 |
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http://www.giraudtool.com/annealer1.htm
Found this on the Hide. Check it out
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Life's concerns should be about the 120lb pack your trying to get to the top of the mountain, and not the rock in your boot.
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Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 14962 |
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I've been told the way to do it is to fill a pan with water with the neck above the water and heat it with a torch then nock it over into the water. Seems like a good deal of trouble to me if done some of the other ways.
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Dale Clifford
Optics Jedi Knight Joined: July/04/2004 Location: United States Status: Offline Points: 5087 |
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any method which heats the neck, then suddenly quenchs the rest of the case will give a line in the brass which will case seperation at that point. This is increased with fl resizing, Oven methods and machine methods risk the primer pocket and web area.
What is the purpose of annealing? To make the case neck tension uniform, out side neck turning is more consistant, more controllable. If the cases have been resized several times the necks will have high spots and valleys that annealling will not remedy.
In either case having a gun/scope combination that would show the difference is the first step.
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