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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.338-.378 Weatherby
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<blockquote data-quote="sable tireur" data-source="post: 1443481" data-attributes="member: 27307"><p>This is one of those processes which needs to be handled very carefully. Having made cut rifled barrels before, one of the last things we did was to lap the barrels using a lead lap coated with extremely fine diamond paste. There is very little scientific method to this; cast the lap, coat it with paste and try to use a consistent motion and pressure. Never let the lap exit either end of the bore until finished. Clean thoroughly after every step and use a borescope to examine the progress. Knowledge and the experience to know what you're looking at and for is imperative. </p><p></p><p>Amateurs can use one of several bore pastes available on the commercial market in combination with a brush, patch and paste. Achieving the right finish comes with experience and practice. Going too far by attempting to achieve a mirror finish usually results in potential 'skidding' or slipping of the bullets on this finish. High polish finishes can also result in an increase of copper in the bore. Then there is the damage to the lands (rounded corners) and maybe even a change in the groove depth, allowing for plasma blow by which can damage the bullet and it's flight characteristics after this occurrence. </p><p></p><p>New barrels which have been lapped properly need very little attention except for judicious cleaning. New barrels which have not been lapped, can be lapped but go slowly and with great care. Consider your investment and let that be your guide. Otherwise, contact a professional and let them handle the problem.</p></blockquote><p></p>
[QUOTE="sable tireur, post: 1443481, member: 27307"] This is one of those processes which needs to be handled very carefully. Having made cut rifled barrels before, one of the last things we did was to lap the barrels using a lead lap coated with extremely fine diamond paste. There is very little scientific method to this; cast the lap, coat it with paste and try to use a consistent motion and pressure. Never let the lap exit either end of the bore until finished. Clean thoroughly after every step and use a borescope to examine the progress. Knowledge and the experience to know what you're looking at and for is imperative. Amateurs can use one of several bore pastes available on the commercial market in combination with a brush, patch and paste. Achieving the right finish comes with experience and practice. Going too far by attempting to achieve a mirror finish usually results in potential 'skidding' or slipping of the bullets on this finish. High polish finishes can also result in an increase of copper in the bore. Then there is the damage to the lands (rounded corners) and maybe even a change in the groove depth, allowing for plasma blow by which can damage the bullet and it's flight characteristics after this occurrence. New barrels which have been lapped properly need very little attention except for judicious cleaning. New barrels which have not been lapped, can be lapped but go slowly and with great care. Consider your investment and let that be your guide. Otherwise, contact a professional and let them handle the problem. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.338-.378 Weatherby
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