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Rifles, Reloading, Optics, Equipment
Gunsmithing
barrel crown
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<blockquote data-quote="Susquatch" data-source="post: 474525" data-attributes="member: 31264"><p>JE: </p><p></p><p>"I see" said the blind man! Ok, I measured the eccentricity and it is as close to zero as one could hope for - less than a thou believe it or not. I expect that is probably because Browning barrels are hammer forged. But maybe its also because they used a centering tool in the bore and then turned the barrel OD. </p><p></p><p>That said, your comment about eccentricity makes me realize that the barrel outside surface has a very high polish on it - almost a mirror surface. Certainly much more so than I see on other Browning barrels. The polishing was probably done after crowning and chambering but before final assembly to the receiver. So I'm back to thinking that the damage was done by a centering tool that came loose and spun. </p><p></p><p>That said, I can see no similar or associated damage to the chamber end of the barrel. Perhaps the threaded end was chucked? Nah, if that was true, the other end would be damaged around the entire circumference of the muzzle crown. More likely they drove the barrel with a tool at the muzzle. The barrel stopped turning and the centering tool burnished and damaged the crown. Yah, it still sounds dumb - who would drive the barrel with a centering tool? But on the other hand, shipping a premium rifle with that kind of damage is dumber still!!!</p><p></p><p>Cheers!</p></blockquote><p></p>
[QUOTE="Susquatch, post: 474525, member: 31264"] JE: "I see" said the blind man! Ok, I measured the eccentricity and it is as close to zero as one could hope for - less than a thou believe it or not. I expect that is probably because Browning barrels are hammer forged. But maybe its also because they used a centering tool in the bore and then turned the barrel OD. That said, your comment about eccentricity makes me realize that the barrel outside surface has a very high polish on it - almost a mirror surface. Certainly much more so than I see on other Browning barrels. The polishing was probably done after crowning and chambering but before final assembly to the receiver. So I'm back to thinking that the damage was done by a centering tool that came loose and spun. That said, I can see no similar or associated damage to the chamber end of the barrel. Perhaps the threaded end was chucked? Nah, if that was true, the other end would be damaged around the entire circumference of the muzzle crown. More likely they drove the barrel with a tool at the muzzle. The barrel stopped turning and the centering tool burnished and damaged the crown. Yah, it still sounds dumb - who would drive the barrel with a centering tool? But on the other hand, shipping a premium rifle with that kind of damage is dumber still!!! Cheers! [/QUOTE]
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barrel crown
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