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Rifles, Reloading, Optics, Equipment
Gunsmithing
How important is blueprinting an action
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<blockquote data-quote="J E Custom" data-source="post: 1839702" data-attributes="member: 2736"><p>I use this word all the time in reference to accuracy. "Consistency" The more accurate everything fits the more consistent/repeatable it will be. </p><p></p><p>The object of blueprinting/truing it to keep stress and movement to a very minimum and locate the cartridge in exactly the same place in the chamber every time and also control movement during firing. If all parts of an action are aligned with the bore centerline, Thrust is in a straight line opposite the bullet travel minimizing the thrust vectors that could effect accuracy in the rifle. With the bolt aligned with the centerline and with proper head space the cartridge is located in the same place in the chamber and not allowed to move in any other direction that could launch a projectile with yaw or improper alignment.</p><p></p><p>If we go to great lengths to load perfect (Concentric ammo, it doesn't make sense to allow your equipment to alter this alignment. Doing many concentricity test, the concentricity of the ammo makes a huge difference in the accuracy. Best accuracy is with 0.000 concentric ammo as you add eccentricity by 0.001 accuracy falls off, when it reaches 0.003 accuracy is not acceptable to many.</p><p>and by the time you reach 0.006 it is practically unusable. it will still fire but that is about the only thing it does.</p><p></p><p>So back to the question If the action has more than 0.0005 misalignment in certain areas it will not be as accurate as it could be. Many shooters will not be able or capable of seeing this improvement, but even the best shot cant reach his potential in a poorly assembled rifle. </p><p></p><p>Slack or improper alignment Is not conducive to consistency, so it should be minimized. One of the quickest ways to spot poor workmanship, is to try a fired case in an action/chamber for ease of closing. Many times it will have to be index't in the same position it was fired in to freely chamber because something was misaligned or allowed to move.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1839702, member: 2736"] I use this word all the time in reference to accuracy. "Consistency" The more accurate everything fits the more consistent/repeatable it will be. The object of blueprinting/truing it to keep stress and movement to a very minimum and locate the cartridge in exactly the same place in the chamber every time and also control movement during firing. If all parts of an action are aligned with the bore centerline, Thrust is in a straight line opposite the bullet travel minimizing the thrust vectors that could effect accuracy in the rifle. With the bolt aligned with the centerline and with proper head space the cartridge is located in the same place in the chamber and not allowed to move in any other direction that could launch a projectile with yaw or improper alignment. If we go to great lengths to load perfect (Concentric ammo, it doesn't make sense to allow your equipment to alter this alignment. Doing many concentricity test, the concentricity of the ammo makes a huge difference in the accuracy. Best accuracy is with 0.000 concentric ammo as you add eccentricity by 0.001 accuracy falls off, when it reaches 0.003 accuracy is not acceptable to many. and by the time you reach 0.006 it is practically unusable. it will still fire but that is about the only thing it does. So back to the question If the action has more than 0.0005 misalignment in certain areas it will not be as accurate as it could be. Many shooters will not be able or capable of seeing this improvement, but even the best shot cant reach his potential in a poorly assembled rifle. Slack or improper alignment Is not conducive to consistency, so it should be minimized. One of the quickest ways to spot poor workmanship, is to try a fired case in an action/chamber for ease of closing. Many times it will have to be index't in the same position it was fired in to freely chamber because something was misaligned or allowed to move. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
How important is blueprinting an action
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