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The Over-Rated Crown
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<blockquote data-quote="AZShooter" data-source="post: 852166" data-attributes="member: 5219"><p>Interesting information Alan,</p><p></p><p>Your imperfect crown test has me scratching my head. All I can think of is that the best crown you used also had some imperfections. Like the idea of testing the variety of crowns at a longer distances. I would imagine it would distinguish the levels of damage. </p><p></p><p>I remember Rick Jamison doing some BC work decades ago. I was amazed then to read that different velocities from same rifle yielded different average BCs. No surprise that you encountered BC shifts for each shot. </p><p></p><p></p><p>I have encountered many hunting rifles both custom and factory with slight imperfections to badly damaged crowns. After cutting a new crown on my lathe witnessed improved groups with ALL rifles with no other changes. </p><p></p><p>I will say that without the aide of a borescope it is difficult to tell the difference between an excellent crown and a slightly damaged crown. To be honest I don't know the magnification differences between your stereoscopic microscope and my hawkeye borescope. Almost ALL the rifles I see including customs and new from factory have imperfect crowns. </p><p></p><p>I asked every gunsmith in my city if they used a borescope. NONE did. I actually proved to one with HIS rifle that his crown was substandard. I was working up loads for his new rifle and told him my borescope inspection showed a flawed crown. He tried several methods and after three attempts he made an excellent crown. After each attempt we would look at the crown and see imperfections. The tool bit had to be resharpened and the third attempt it did a good job. The rifle's group size shrunk dramatically from his original crown finish. </p><p></p><p>I'll stick with as close to perfect crown every time.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 852166, member: 5219"] Interesting information Alan, Your imperfect crown test has me scratching my head. All I can think of is that the best crown you used also had some imperfections. Like the idea of testing the variety of crowns at a longer distances. I would imagine it would distinguish the levels of damage. I remember Rick Jamison doing some BC work decades ago. I was amazed then to read that different velocities from same rifle yielded different average BCs. No surprise that you encountered BC shifts for each shot. I have encountered many hunting rifles both custom and factory with slight imperfections to badly damaged crowns. After cutting a new crown on my lathe witnessed improved groups with ALL rifles with no other changes. I will say that without the aide of a borescope it is difficult to tell the difference between an excellent crown and a slightly damaged crown. To be honest I don't know the magnification differences between your stereoscopic microscope and my hawkeye borescope. Almost ALL the rifles I see including customs and new from factory have imperfect crowns. I asked every gunsmith in my city if they used a borescope. NONE did. I actually proved to one with HIS rifle that his crown was substandard. I was working up loads for his new rifle and told him my borescope inspection showed a flawed crown. He tried several methods and after three attempts he made an excellent crown. After each attempt we would look at the crown and see imperfections. The tool bit had to be resharpened and the third attempt it did a good job. The rifle's group size shrunk dramatically from his original crown finish. I'll stick with as close to perfect crown every time. [/QUOTE]
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