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Rifles, Reloading, Optics, Equipment
Gunsmithing
Boresighting WAAAYYY off. Is this a dodgey barrel.
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<blockquote data-quote="MNbogboy" data-source="post: 1837484" data-attributes="member: 18849"><p>No experience in 17 caliber but have seen this in larger calibers (6.5 & .308). The apparent "visual bore sight" aligned with the target & reticle shoots off target. My experience has shown this as a product of extreme bore curvature. A visual through the bore may detect an oval like picture rather than round. If you could compare a known "good" barrel side by side with the "suspect" one it is possible to see a difference in the sight picture. All barrels have some amount of curvature in the bore due to the "gun drill" process.</p><p>Some gunsmiths actually "clock" this curvature at 12:00 or 6:00 to eliminate horizontal POI deviation as barrel temperature changes.</p><p>My guess it is not the crown causing the problem because it groups well. Also the 17 caliber drill would be more apt to wander during the gun drill process due to its rigidity.</p><p>A possible solution would be to have a gunsmith clock it up and adjust the headspace by reaming or recoil lug thickness (depending on the rifle).</p><p></p><p>Just a couple of thoughts,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1837484, member: 18849"] No experience in 17 caliber but have seen this in larger calibers (6.5 & .308). The apparent "visual bore sight" aligned with the target & reticle shoots off target. My experience has shown this as a product of extreme bore curvature. A visual through the bore may detect an oval like picture rather than round. If you could compare a known "good" barrel side by side with the "suspect" one it is possible to see a difference in the sight picture. All barrels have some amount of curvature in the bore due to the "gun drill" process. Some gunsmiths actually "clock" this curvature at 12:00 or 6:00 to eliminate horizontal POI deviation as barrel temperature changes. My guess it is not the crown causing the problem because it groups well. Also the 17 caliber drill would be more apt to wander during the gun drill process due to its rigidity. A possible solution would be to have a gunsmith clock it up and adjust the headspace by reaming or recoil lug thickness (depending on the rifle). Just a couple of thoughts, Randy [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Boresighting WAAAYYY off. Is this a dodgey barrel.
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