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Rifles, Reloading, Optics, Equipment
Reloading
Horizontal stringing in .243
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<blockquote data-quote="Bart B" data-source="post: 519925" data-attributes="member: 5302"><p>There are hundreds (thousands?) of competitive shooters who know that's not true. I and others have shot super accurate rifles starting with cold clean barrels and putting 20 to 30 shots downrange and point of impact doesn't change. One test of such heating started with a cold barrel and 20 shots later, each fired at intervals of about 30 seconds, all 20 went inside 3.5 inches at 800 yards. Done the same thing with a 30 caliber magnum putting 30 shots inside 7 inches at 1000. </p><p></p><p>A friend put 57 shots fired from the same .308 Win. case into 1/3 inch at 100 yards starting with a cold barrel. Shots were fired about every minute as he was full length sizing the case each time and making measurements of it. That barrel may well have fried an egg if one was put on it. </p><p></p><p>Anytime point of impact changes after the barrel heats up the problem is usually in the receiver. It's face ain't squared up with the chamber axis. The high point puts more pressure on the barrel at that point when metal expands from heat causing the barrel to whip differently as more shots are fired. </p><p></p><p>The other probable cause is the barrel's not stress relieved properly. As it heats up, the stress lines cause it to bend. That makes the muzzle axis point somewhere else after heating than when it was cold.</p><p></p><p>Proper fitting and stress relieving of good barrels prevents zero changes as the barrel heats up.</p></blockquote><p></p>
[QUOTE="Bart B, post: 519925, member: 5302"] There are hundreds (thousands?) of competitive shooters who know that's not true. I and others have shot super accurate rifles starting with cold clean barrels and putting 20 to 30 shots downrange and point of impact doesn't change. One test of such heating started with a cold barrel and 20 shots later, each fired at intervals of about 30 seconds, all 20 went inside 3.5 inches at 800 yards. Done the same thing with a 30 caliber magnum putting 30 shots inside 7 inches at 1000. A friend put 57 shots fired from the same .308 Win. case into 1/3 inch at 100 yards starting with a cold barrel. Shots were fired about every minute as he was full length sizing the case each time and making measurements of it. That barrel may well have fried an egg if one was put on it. Anytime point of impact changes after the barrel heats up the problem is usually in the receiver. It's face ain't squared up with the chamber axis. The high point puts more pressure on the barrel at that point when metal expands from heat causing the barrel to whip differently as more shots are fired. The other probable cause is the barrel's not stress relieved properly. As it heats up, the stress lines cause it to bend. That makes the muzzle axis point somewhere else after heating than when it was cold. Proper fitting and stress relieving of good barrels prevents zero changes as the barrel heats up. [/QUOTE]
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Horizontal stringing in .243
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