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Rifles, Reloading, Optics, Equipment
Gunsmithing
barrel crown
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<blockquote data-quote="Susquatch" data-source="post: 474128" data-attributes="member: 31264"><p>Thanks JE</p><p></p><p>I don't think its a back of the tool thing or the damage would be all the way around the crown, not just one side. </p><p></p><p>Yes, the bevel on the lands and groove is what I noticed first. I could not see it with the naked eye, but it jumped out at me with a Jewelers loop. I always inspect the crown, last inch if bore, and chamber visually with any rifle before I shoot it. As your quote says "The last thing that effects the bullet is the crown and after that mother nature and the bullet maker had control." I never put it quite that way, but it reflects my sentiments exactly!</p><p></p><p>I think a turning pilot makes some sense. The only aspect that says otherwise is the angle on the burnishing - quite steep. It would have to be a pretty short pilot or perhaps a 22 caliber pilot in a 30 cal hole. The molten stainless droplets and temper change also signal something very hard spinning fairly fast. </p><p></p><p>Unfortunately, I cannot see any marks on the wear to signal the direction of movement (in/out or rotational). If I knew it was rotational I wouldn't worry - I would just re-crown and be done with it because I would know that the odds of additional internal damage would be MUCH lower.</p><p></p><p>Anyway, all good guesses. Cheers and Thanks JE!</p></blockquote><p></p>
[QUOTE="Susquatch, post: 474128, member: 31264"] Thanks JE I don't think its a back of the tool thing or the damage would be all the way around the crown, not just one side. Yes, the bevel on the lands and groove is what I noticed first. I could not see it with the naked eye, but it jumped out at me with a Jewelers loop. I always inspect the crown, last inch if bore, and chamber visually with any rifle before I shoot it. As your quote says "The last thing that effects the bullet is the crown and after that mother nature and the bullet maker had control." I never put it quite that way, but it reflects my sentiments exactly! I think a turning pilot makes some sense. The only aspect that says otherwise is the angle on the burnishing - quite steep. It would have to be a pretty short pilot or perhaps a 22 caliber pilot in a 30 cal hole. The molten stainless droplets and temper change also signal something very hard spinning fairly fast. Unfortunately, I cannot see any marks on the wear to signal the direction of movement (in/out or rotational). If I knew it was rotational I wouldn't worry - I would just re-crown and be done with it because I would know that the odds of additional internal damage would be MUCH lower. Anyway, all good guesses. Cheers and Thanks JE! [/QUOTE]
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barrel crown
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