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Remington 700.... bad years?
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<blockquote data-quote="J E Custom" data-source="post: 1336907" data-attributes="member: 2736"><p>Most factory barrels are still straightened after they are bored because they aren't drilled straight. They use a barrel straightener that is used to Bend the barrel on the outside to straighten the bore. This is/was common practice.</p><p></p><p>Hear is a picture of a barrel being straightened in one of the machines buy looking through the bore. (This used to be done only by the most experienced gunsmiths)</p><p><a href="https://www.google.com/search?q=rifle+barrel+straightening&tbm=isch&imgil=ANsy2uBq2nEJGM%253A%253B5192MSGPiJ05fM%253Bhttp%25253A%25252F%25252Fwww.network54.com%25252FForum%25252F79537%25252Fthread%25252F1355608551%25252FIs%2525252Bit%2525252Bjust%2525252Bme%2525252Bor%2525252Bdoes%2525252Bbending%2525252Ba%2525252Bbarrel%2525252Bseem%2525252Blike%2525252Ba%2525252Bbad---&source=iu&pf=m&fir=ANsy2uBq2nEJGM%253A%252C5192MSGPiJ05fM%252C_&usg=__m0w8m1esNg4D-bgIuLiRXAEFJDY%3D&biw=1120&bih=541&ved=0ahUKEwjYkI3fzvHVAhUL6SYKHYIHBy8QyjcISQ&ei=kLCfWdiICIvSmwGCj5z4Ag#imgrc=ANsy2uBq2nEJGM:&spf=1503637709954" target="_blank">https://www.google.com/search?q=rifle+barrel+straightening&tbm=isch&imgil=ANsy2uBq2nEJGM%3A%3B5192MSGPiJ05fM%3Bhttp%253A%252F%252Fwww.network54.com%252FForum%252F79537%252Fthread%252F1355608551%252FIs%25252Bit%25252Bjust%25252Bme%25252Bor%25252Bdoes%25252Bbending%25252Ba%25252Bbarrel%25252Bseem%25252Blike%25252Ba%25252Bbad---&source=iu&pf=m&fir=ANsy2uBq2nEJGM%3A%2C5192MSGPiJ05fM%2C_&usg=__m0w8m1esNg4D-bgIuLiRXAEFJDY=&biw=1120&bih=541&ved=0ahUKEwjYkI3fzvHVAhUL6SYKHYIHBy8QyjcISQ&ei=kLCfWdiICIvSmwGCj5z4Ag#imgrc=ANsy2uBq2nEJGM:&spf=1503637709954</a></p><p></p><p>When you place a barrel between centers, it will have run out on the outside of the barrel if it was straightened. there is an expectable amount of run out that varies from different manufactures of custom barrel makers and it normally ranges from .001 to .007. factory barrels may vary up to .050 +. Barrels with run out will lose accuracy the more run out they have because as they heat up the barrel expansion will be different from one side to the other.</p><p></p><p>Premium custom barrels normally have less than .002 thousandths and many times that is caused by external sanding to remove machine marks. When building a precision rifle, if it has any run out I like to re contour it between centers to bring run out to .000.</p><p></p><p>A small amount of run out doesn't seem to matter as long as the consecutive shots are held to a minimum and heat is controlled.</p><p></p><p>So "Bent barrels" could just be the outside because of straightening and not hurt accuracy as long as it wasn't to bad. Most if not all factory barrels will show run out (Look Bent)if placed between centers but as long as the barrel bore is straight you have a chance that it will shoot well.</p><p></p><p>I hope this explains it better.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1336907, member: 2736"] Most factory barrels are still straightened after they are bored because they aren't drilled straight. They use a barrel straightener that is used to Bend the barrel on the outside to straighten the bore. This is/was common practice. Hear is a picture of a barrel being straightened in one of the machines buy looking through the bore. (This used to be done only by the most experienced gunsmiths) [URL='https://www.google.com/search?q=rifle+barrel+straightening&tbm=isch&imgil=ANsy2uBq2nEJGM%253A%253B5192MSGPiJ05fM%253Bhttp%25253A%25252F%25252Fwww.network54.com%25252FForum%25252F79537%25252Fthread%25252F1355608551%25252FIs%2525252Bit%2525252Bjust%2525252Bme%2525252Bor%2525252Bdoes%2525252Bbending%2525252Ba%2525252Bbarrel%2525252Bseem%2525252Blike%2525252Ba%2525252Bbad---&source=iu&pf=m&fir=ANsy2uBq2nEJGM%253A%252C5192MSGPiJ05fM%252C_&usg=__m0w8m1esNg4D-bgIuLiRXAEFJDY%3D&biw=1120&bih=541&ved=0ahUKEwjYkI3fzvHVAhUL6SYKHYIHBy8QyjcISQ&ei=kLCfWdiICIvSmwGCj5z4Ag#imgrc=ANsy2uBq2nEJGM:&spf=1503637709954']https://www.google.com/search?q=rifle+barrel+straightening&tbm=isch&imgil=ANsy2uBq2nEJGM%3A%3B5192MSGPiJ05fM%3Bhttp%253A%252F%252Fwww.network54.com%252FForum%252F79537%252Fthread%252F1355608551%252FIs%25252Bit%25252Bjust%25252Bme%25252Bor%25252Bdoes%25252Bbending%25252Ba%25252Bbarrel%25252Bseem%25252Blike%25252Ba%25252Bbad---&source=iu&pf=m&fir=ANsy2uBq2nEJGM%3A%2C5192MSGPiJ05fM%2C_&usg=__m0w8m1esNg4D-bgIuLiRXAEFJDY=&biw=1120&bih=541&ved=0ahUKEwjYkI3fzvHVAhUL6SYKHYIHBy8QyjcISQ&ei=kLCfWdiICIvSmwGCj5z4Ag#imgrc=ANsy2uBq2nEJGM:&spf=1503637709954[/URL] When you place a barrel between centers, it will have run out on the outside of the barrel if it was straightened. there is an expectable amount of run out that varies from different manufactures of custom barrel makers and it normally ranges from .001 to .007. factory barrels may vary up to .050 +. Barrels with run out will lose accuracy the more run out they have because as they heat up the barrel expansion will be different from one side to the other. Premium custom barrels normally have less than .002 thousandths and many times that is caused by external sanding to remove machine marks. When building a precision rifle, if it has any run out I like to re contour it between centers to bring run out to .000. A small amount of run out doesn't seem to matter as long as the consecutive shots are held to a minimum and heat is controlled. So "Bent barrels" could just be the outside because of straightening and not hurt accuracy as long as it wasn't to bad. Most if not all factory barrels will show run out (Look Bent)if placed between centers but as long as the barrel bore is straight you have a chance that it will shoot well. I hope this explains it better. J E CUSTOM [/QUOTE]
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