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Rifles, Reloading, Optics, Equipment
Gunsmithing
Recrown Barrel / Brownells Chamfering Cutter?
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<blockquote data-quote="Deleted member 46119" data-source="post: 980685"><p>On the effect of crown imperfections and accuracy, I'm with JE on this. </p><p></p><p>Regardless of what someone wrote in an article, physics is physics. Per Sir Isac Newton if you disturb the projectile it will deviate. After that, what is accuracy? Per the article accuracy went from 1/2 to 3/4 and the writer considered it trivial. Math will show us that is a 50% decrease in accuracy. NOT TRIVIAL.</p><p></p><p>I think the article was written by someone who was very bad at keeping their rifles in good shape and needed social support for their guilt.</p><p></p><p>Where I disagree with JE is on hand tools vs. machine tools. Yes if you have a lathe setup to turn barrels and you do it all day, every day. The lathe is the tool you would use. However, if that is not the case then <strong>hand tools if of high quality</strong> IMO are a viable option but...</p><p></p><p>Understanding at least a little about machining is IMO important.</p><p></p><p>Digression, JE, I crowned a muzzle last night the chip from chamfering the outside of the barrel reached 4 inches before the breaking. It's about speeds and feeds, even with hand tools. When neck turning brass I often reach 2 inch brass chips. </p><p></p><p>This is my opinion based in experience and some knowledge.</p><p></p><p>Now regarding Brownell's tools. Me no like. The design puts a moving surface inside the barrel, contacting rifling. Constant change of angles. </p><p></p><p>I like Manson's tools. The rod becomes rigid in the barrel. I know there is no way you can get a long, consistent chip unless the tool is stable. I would not use the hand crank version. Variable speed drivers are now standard on anyone's work bench, so use the driver adapter. To me, the hand crank version will pull the cutter off center.</p></blockquote><p></p>
[QUOTE="Deleted member 46119, post: 980685"] On the effect of crown imperfections and accuracy, I'm with JE on this. Regardless of what someone wrote in an article, physics is physics. Per Sir Isac Newton if you disturb the projectile it will deviate. After that, what is accuracy? Per the article accuracy went from 1/2 to 3/4 and the writer considered it trivial. Math will show us that is a 50% decrease in accuracy. NOT TRIVIAL. I think the article was written by someone who was very bad at keeping their rifles in good shape and needed social support for their guilt. Where I disagree with JE is on hand tools vs. machine tools. Yes if you have a lathe setup to turn barrels and you do it all day, every day. The lathe is the tool you would use. However, if that is not the case then [B]hand tools if of high quality[/B] IMO are a viable option but... Understanding at least a little about machining is IMO important. Digression, JE, I crowned a muzzle last night the chip from chamfering the outside of the barrel reached 4 inches before the breaking. It's about speeds and feeds, even with hand tools. When neck turning brass I often reach 2 inch brass chips. This is my opinion based in experience and some knowledge. Now regarding Brownell's tools. Me no like. The design puts a moving surface inside the barrel, contacting rifling. Constant change of angles. I like Manson's tools. The rod becomes rigid in the barrel. I know there is no way you can get a long, consistent chip unless the tool is stable. I would not use the hand crank version. Variable speed drivers are now standard on anyone's work bench, so use the driver adapter. To me, the hand crank version will pull the cutter off center. [/QUOTE]
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Recrown Barrel / Brownells Chamfering Cutter?
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