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The Basics, Starting Out
Breaking in new barrel question
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<blockquote data-quote="Waltech Jim" data-source="post: 64601" data-attributes="member: 3214"><p>fourinone,</p><p></p><p>Very little changes with respect to the barrel, it is the throat area that should be the focus of any barrel break in, and hence discussion. This is a copy of my contribution to the last LRH thread on barrel break in. I edited the following for the sake of time.</p><p></p><p>"It has been well established the chambering of a barrel leaves marks or ridges if you will, that are transverse to the passage of the bullet. These ridges, especially early in the barrels life will scrape a small amount of copper from the bullet as it passes over them. Just after the bullet passes over these grooves, if we were able to take a high speed picture of them, we would see copper in the valleys of these grooves, much like what would happen if you scraped a bullet over a file. But the copper does not stay there long. As the temperature and pressure rise in the throat area (from the burning powder) the copper vaporizes and is carried down the barrel and deposited.</p><p> </p><p>The very tips of the ridges are now subjected to heat that raises the temperature to the point the metal becomes relatively soft. As the burning powder scrapes across these superheated ridges it removes the very top of them. With the next round there is slightly less of a ridge present and hence less copper and steel is removed. Sharp pointed ridges with narrow bases, from a sharp reamer tend to be worn down quickly. Rounded, broad based ridges from a dull reamer wear more slowly and produce more copper fouling. </p><p></p><p>You can demonstrate this quite well with an old file. Take a torch and play it across the teeth. You can very quickly get the teeth to the melting point while the backbone remains relatively cool. </p><p></p><p>At least in my mind this explains why chambers made with sharp reamers take few rounds to break in and deposit little copper in the process. Also that (some) factory barrels may require many more rounds to break in."</p><p> ------------------------------------------------</p><p></p><p>John M. urged me to talk with Krieger on the phone as they recommend a relatively common break in proceedure (for their barrels) on their web site and he got a somewhat different opinion on the phone. I called Krieger and their answer to my questions were: </p><p></p><p>1. "...barrel break in is not a fallacy"</p><p>2. "...barrels chambered with sharp reamers will take very little break in. Maybe none at all. Chamber (throats) cut with dull reamers can take considerably longer to break in. If the barrel is shooting good and deposits little copper, it is broke in."</p><p></p><p>I have the highest respect for Mr. Allens' opinions. I believe he said it best. "The most important thing is that you actually break the barrel in"</p><p></p><p>Jim</p></blockquote><p></p>
[QUOTE="Waltech Jim, post: 64601, member: 3214"] fourinone, Very little changes with respect to the barrel, it is the throat area that should be the focus of any barrel break in, and hence discussion. This is a copy of my contribution to the last LRH thread on barrel break in. I edited the following for the sake of time. “It has been well established the chambering of a barrel leaves marks or ridges if you will, that are transverse to the passage of the bullet. These ridges, especially early in the barrels life will scrape a small amount of copper from the bullet as it passes over them. Just after the bullet passes over these grooves, if we were able to take a high speed picture of them, we would see copper in the valleys of these grooves, much like what would happen if you scraped a bullet over a file. But the copper does not stay there long. As the temperature and pressure rise in the throat area (from the burning powder) the copper vaporizes and is carried down the barrel and deposited. The very tips of the ridges are now subjected to heat that raises the temperature to the point the metal becomes relatively soft. As the burning powder scrapes across these superheated ridges it removes the very top of them. With the next round there is slightly less of a ridge present and hence less copper and steel is removed. Sharp pointed ridges with narrow bases, from a sharp reamer tend to be worn down quickly. Rounded, broad based ridges from a dull reamer wear more slowly and produce more copper fouling. You can demonstrate this quite well with an old file. Take a torch and play it across the teeth. You can very quickly get the teeth to the melting point while the backbone remains relatively cool. At least in my mind this explains why chambers made with sharp reamers take few rounds to break in and deposit little copper in the process. Also that (some) factory barrels may require many more rounds to break in.” ------------------------------------------------ John M. urged me to talk with Krieger on the phone as they recommend a relatively common break in proceedure (for their barrels) on their web site and he got a somewhat different opinion on the phone. I called Krieger and their answer to my questions were: 1. “...barrel break in is not a fallacy” 2. “...barrels chambered with sharp reamers will take very little break in. Maybe none at all. Chamber (throats) cut with dull reamers can take considerably longer to break in. If the barrel is shooting good and deposits little copper, it is broke in.” I have the highest respect for Mr. Allens’ opinions. I believe he said it best. “The most important thing is that you actually break the barrel in” Jim [/QUOTE]
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