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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fine Scratch on Land -how worried should I be?
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<blockquote data-quote="Fiftydriver" data-source="post: 72529" data-attributes="member: 10"><p>Brown Dog,</p><p></p><p>Looks like there was a burr or sharp edge on the pilot bushing used to crown the muzzle. This has happened to me as well in the past. Now whenever I get a set of pilot bushings in I polish and round both ends to ensure this does not happen.</p><p></p><p>Did this to one of my 2000 yard rifles in 338-300 RUM and did not notice it until I shot the rifle and it was printing 1 moa groups at 500 yards. Gave the rifle a total look over and sure enough there was a little groove in the rifling just as you have in your picture.</p><p></p><p>The problem is that it generally takes material off the lands so that it is undersized on that land and the bullet will release early and create a yaw in the bullet.</p><p></p><p>This will be more appearant in a 3 or 4 groove barrel and as I can clearly see you have a 4 groove.</p><p></p><p>As a rifle builder I will tell you things happen. Give the guy a chance to make it right before you do anything else. If a customer brough a rifle to me that I had worked on that had this problem, and it happened early on, I would fix the problem at no charge at all even if it ment a total rethreading of the muzzle. Shipping should also be covered to and from in my opinion.</p><p></p><p>Give him a chance to make it right though. It sucks but things like a little burr on a pilot bushing happen and at times slip by visual inspection.</p><p></p><p>Pointing this out to him will also help him prevent it in the future as well.</p><p></p><p>Your barrel is certianly not ruined, just needs a bit taken off the end!!</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 72529, member: 10"] Brown Dog, Looks like there was a burr or sharp edge on the pilot bushing used to crown the muzzle. This has happened to me as well in the past. Now whenever I get a set of pilot bushings in I polish and round both ends to ensure this does not happen. Did this to one of my 2000 yard rifles in 338-300 RUM and did not notice it until I shot the rifle and it was printing 1 moa groups at 500 yards. Gave the rifle a total look over and sure enough there was a little groove in the rifling just as you have in your picture. The problem is that it generally takes material off the lands so that it is undersized on that land and the bullet will release early and create a yaw in the bullet. This will be more appearant in a 3 or 4 groove barrel and as I can clearly see you have a 4 groove. As a rifle builder I will tell you things happen. Give the guy a chance to make it right before you do anything else. If a customer brough a rifle to me that I had worked on that had this problem, and it happened early on, I would fix the problem at no charge at all even if it ment a total rethreading of the muzzle. Shipping should also be covered to and from in my opinion. Give him a chance to make it right though. It sucks but things like a little burr on a pilot bushing happen and at times slip by visual inspection. Pointing this out to him will also help him prevent it in the future as well. Your barrel is certianly not ruined, just needs a bit taken off the end!! Good Shooting!! Kirby Allen(50) [/QUOTE]
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Fine Scratch on Land -how worried should I be?
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