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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Proof barrel slowing down.
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<blockquote data-quote="lsoccorsi" data-source="post: 1449710" data-attributes="member: 88294"><p>Typically when breaking in a new barrel this exercise is a shoot and clean process that helps smooth the lands and grooves to reduce friction and ultimately reduce copper fouling. If this process is done correctly using the proper solvents/barrel polish, it usually takes between 25 and 50 rounds depending on the quality of the barrel. If you start off with a quality barrel that was honed prior to installation, normally you don't have much of a "break in" period. If the throat has 0.009" erosion, seating the bullet out a little further will take care of this issue and is a simple fix. With respect to the slower velocity, I would try cleaning the barrel with Bore Tech Eliminator and/or KG-12 copper removal and never use a brush just the properly fitted jag. If you have a small area in your barrel that is peeling a little jacket material off the bullet, you could be loosing pressure as a result of the removal of jacket material and getting some gas blow by between the bullet & the rifling. However, this usually effects accuracy to some varying degree from small changes in group size to significant differences in group size depending on the degree of the fouling area. Also, check your powder as some powders can change from lot to lot. Best advise is to thoroughly clean the barrel will copper solvent and a jag no brushes and reduce the amount of rounds through the barrel between cleaning. See if that helps.</p></blockquote><p></p>
[QUOTE="lsoccorsi, post: 1449710, member: 88294"] Typically when breaking in a new barrel this exercise is a shoot and clean process that helps smooth the lands and grooves to reduce friction and ultimately reduce copper fouling. If this process is done correctly using the proper solvents/barrel polish, it usually takes between 25 and 50 rounds depending on the quality of the barrel. If you start off with a quality barrel that was honed prior to installation, normally you don't have much of a "break in" period. If the throat has 0.009" erosion, seating the bullet out a little further will take care of this issue and is a simple fix. With respect to the slower velocity, I would try cleaning the barrel with Bore Tech Eliminator and/or KG-12 copper removal and never use a brush just the properly fitted jag. If you have a small area in your barrel that is peeling a little jacket material off the bullet, you could be loosing pressure as a result of the removal of jacket material and getting some gas blow by between the bullet & the rifling. However, this usually effects accuracy to some varying degree from small changes in group size to significant differences in group size depending on the degree of the fouling area. Also, check your powder as some powders can change from lot to lot. Best advise is to thoroughly clean the barrel will copper solvent and a jag no brushes and reduce the amount of rounds through the barrel between cleaning. See if that helps. [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
Proof barrel slowing down.
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