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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6mm creed or 6.5 creed?
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<blockquote data-quote="Frog4aday" data-source="post: 1679701" data-attributes="member: 9308"><p>Last guy having 'mysterious' accuracy issues turned out to have a loose muzzle brake, but if you've had it on and off, that's not it. Interesting that it is not shooting well w/the brake on or off. Makes me think the crown. And the naked eye seems like it should see a problem, but it doesn't always work that way. My smith told me my crown was a mess and I thought it looked fine. He recrowned it and...the gun shot great. So I don't know what he saw or how he saw it, but apparently my visual assessment was worth the money I paid for it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>I'm wondering if the gunsmith sticks a bar/guide down the barrel to ensure alignment with the bore as he gets his machines setup and indexed to cut the threads and in the process of doing all that - and cutting the threads - something got dinged or skewed along the way with your crown. There really isn't a good reason for your gun to go from shooting great to shooting badly unless the crown got compromised in the process.</p><p></p><p>Now if you said it shoots great <u>without</u> the brake and woefully with it on, then we'd be looking at the brake itself (alignment, size of hole in it, the indexing of it...stuff like that.) Hopefully you can convince your smith to touch up the crown for you and see if that cures the problem. If not...I'd be looking at cutting the threaded bit off, recrowning it and forgoing the muzzlebrake for that gun. At 1200 rounds through that 6.5CM, you should still have some life left in that barrel (see this URL for some idea on usable barrel life in the 6.5 CM: <a href="https://www.65creedmoor.com/index.php?topic=299.msg1753#msg1753" target="_blank">https://www.65creedmoor.com/index.php?topic=299.msg1753#msg1753</a>)</p><p></p><p>It could just be that you need to firelap the barrel to clean up some erosion/roughness at the leade and it was just coincidental that problems cropped up around the time you fit a muzzlebrake? Weird things happen.</p></blockquote><p></p>
[QUOTE="Frog4aday, post: 1679701, member: 9308"] Last guy having 'mysterious' accuracy issues turned out to have a loose muzzle brake, but if you've had it on and off, that's not it. Interesting that it is not shooting well w/the brake on or off. Makes me think the crown. And the naked eye seems like it should see a problem, but it doesn't always work that way. My smith told me my crown was a mess and I thought it looked fine. He recrowned it and...the gun shot great. So I don't know what he saw or how he saw it, but apparently my visual assessment was worth the money I paid for it ;) I'm wondering if the gunsmith sticks a bar/guide down the barrel to ensure alignment with the bore as he gets his machines setup and indexed to cut the threads and in the process of doing all that - and cutting the threads - something got dinged or skewed along the way with your crown. There really isn't a good reason for your gun to go from shooting great to shooting badly unless the crown got compromised in the process. Now if you said it shoots great [U]without[/U] the brake and woefully with it on, then we'd be looking at the brake itself (alignment, size of hole in it, the indexing of it...stuff like that.) Hopefully you can convince your smith to touch up the crown for you and see if that cures the problem. If not...I'd be looking at cutting the threaded bit off, recrowning it and forgoing the muzzlebrake for that gun. At 1200 rounds through that 6.5CM, you should still have some life left in that barrel (see this URL for some idea on usable barrel life in the 6.5 CM: [URL]https://www.65creedmoor.com/index.php?topic=299.msg1753#msg1753[/URL]) It could just be that you need to firelap the barrel to clean up some erosion/roughness at the leade and it was just coincidental that problems cropped up around the time you fit a muzzlebrake? Weird things happen. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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6mm creed or 6.5 creed?
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