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Chatter Marks on Barrels...
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<blockquote data-quote="J E Custom" data-source="post: 1242766" data-attributes="member: 2736"><p>Sorry I disagree. Any machine marks can/does cause accuracy problems unless they are filled up with copper. Machine marks are caused by poor tooling or cutting speed causing the cutter to chatter leaving these marks. When these marks are on the lands "only" it is from the drilling process before the final reaming to get the proper bore size. buttoned rifling actually forge the grooves and they are smooth because the button if lubricated and leaves little or no marks and when they do they run with the rifle bore. If the final reaming is not done to the correct sizing for the displacement of the material from the grooves there will be rough lands but not chatter marks.</p><p></p><p>With cut rifling, the cutting broach has to fit the bore perfectly and be used at the right speed or it will chatter leaving chatter marks in both the lands and groves at the same time.</p><p></p><p>Any marks running perpendicular to the bore will cause accuracy loss and will increase the fouling rate plus it can lower the velocity by as much as 50+ft/sec (This is one of the reasons some premium are hand lapped from the maker, to improve overall performance).</p><p></p><p>Poor quality and machine marks are very common on low cost barrels because they don't make the effort and spend the extra cost to make them as good as they can. Hence the reason they can sell them for less and make the same or greater profit margin. There were many brands That I wouldn't use because of quality and consistency. And this is an example of that. I tried to find out who the barrel maker for Brownells premium barrels was, and all I could find out was Made in USA. with no mention of who. they list other barrels by there maker.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1242766, member: 2736"] Sorry I disagree. Any machine marks can/does cause accuracy problems unless they are filled up with copper. Machine marks are caused by poor tooling or cutting speed causing the cutter to chatter leaving these marks. When these marks are on the lands "only" it is from the drilling process before the final reaming to get the proper bore size. buttoned rifling actually forge the grooves and they are smooth because the button if lubricated and leaves little or no marks and when they do they run with the rifle bore. If the final reaming is not done to the correct sizing for the displacement of the material from the grooves there will be rough lands but not chatter marks. With cut rifling, the cutting broach has to fit the bore perfectly and be used at the right speed or it will chatter leaving chatter marks in both the lands and groves at the same time. Any marks running perpendicular to the bore will cause accuracy loss and will increase the fouling rate plus it can lower the velocity by as much as 50+ft/sec (This is one of the reasons some premium are hand lapped from the maker, to improve overall performance). Poor quality and machine marks are very common on low cost barrels because they don't make the effort and spend the extra cost to make them as good as they can. Hence the reason they can sell them for less and make the same or greater profit margin. There were many brands That I wouldn't use because of quality and consistency. And this is an example of that. I tried to find out who the barrel maker for Brownells premium barrels was, and all I could find out was Made in USA. with no mention of who. they list other barrels by there maker. J E CUSTOM [/QUOTE]
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