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Rifles, Reloading, Optics, Equipment
Gunsmithing
barrel crown
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<blockquote data-quote="RoyB" data-source="post: 474569" data-attributes="member: 1632"><p>The whole issue between 11 degree and 90 degree is accuracy of the set up.</p><p></p><p>For an 11 degree crown to be perfect the barrel needs to be set up with absolute zero run out. The bore or the lands (another controversy) needs to be dialed in perfectly.</p><p></p><p>To cut a 90 degree crown it only matters that your cross slide is tangent to the centerline of the headstock. The barrels bore could be oscillating for all you care, the cut will still be 90 degrees.</p><p></p><p>"Simply making a 90 degree cut would leave burrs. " This is a quote from a prev post...All I can say is...Huh???</p><p></p><p>A couple years ago there was an article in shooting times where a fellow cut a muzzle at various angles and accuracy didn't suffer. Unfortunately he wasn't using a benchrest accurate rifle so "accuracy" becomes relative. Just like the military tests of 50 years ago where 11 degrees was "discovered". I have a 6BR benchrest rifle that shoots in the 2s and has for years. I've recrowned the barrel six times and alternate between 11 degree and 90 degree. I've not been able to discern a lick of difference. Not a scientific test for sure, but it's all I can offer...</p></blockquote><p></p>
[QUOTE="RoyB, post: 474569, member: 1632"] The whole issue between 11 degree and 90 degree is accuracy of the set up. For an 11 degree crown to be perfect the barrel needs to be set up with absolute zero run out. The bore or the lands (another controversy) needs to be dialed in perfectly. To cut a 90 degree crown it only matters that your cross slide is tangent to the centerline of the headstock. The barrels bore could be oscillating for all you care, the cut will still be 90 degrees. "Simply making a 90 degree cut would leave burrs. " This is a quote from a prev post...All I can say is...Huh??? A couple years ago there was an article in shooting times where a fellow cut a muzzle at various angles and accuracy didn't suffer. Unfortunately he wasn't using a benchrest accurate rifle so "accuracy" becomes relative. Just like the military tests of 50 years ago where 11 degrees was "discovered". I have a 6BR benchrest rifle that shoots in the 2s and has for years. I've recrowned the barrel six times and alternate between 11 degree and 90 degree. I've not been able to discern a lick of difference. Not a scientific test for sure, but it's all I can offer... [/QUOTE]
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Gunsmithing
barrel crown
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