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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope Not Level With My Action
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<blockquote data-quote="Gcan" data-source="post: 1700416" data-attributes="member: 102867"><p>I'm not sure this is the place for this subject: not all right/left POI shift is scope related. </p><p>I actually built a very precise adj fixture for Setting plumb on a scope. I can dial neg or *** roll to seconds. </p><p></p><p>Barrel indexing must always be considered. You can have a scope dialed in exactly 00.00.00 and still have right/left POI shift at distances. This is particularly true of Rems and other off the shelf OEM guns. Also true for many so called "Custom" guns built by ppl who think action/chamber alignment only. Every barrel bore has a bow in it. No bore is perfectly straight. Even with the barrel chambered and mated to the action perfectly, if the muzzle/bore variation is not indexed perfectly in the vertical alignment then a 100 yard windage zero can be off by MOAs at 1000 yards with a perfectly set up scope. In other words the scope is tracking 6 to 12 O'clock but the muzzle is pointed 7 to 2 O'clock. Your POI will be farther to the right the farther you shoot. </p><p></p><p>I use my jig to align the scope to where the gun prints. If I'm level but the gun shoots 1 moa right at 1000 I use my jig to move the scope to match the barrel.</p></blockquote><p></p>
[QUOTE="Gcan, post: 1700416, member: 102867"] I’m not sure this is the place for this subject: not all right/left POI shift is scope related. I actually built a very precise adj fixture for Setting plumb on a scope. I can dial neg or *** roll to seconds. Barrel indexing must always be considered. You can have a scope dialed in exactly 00.00.00 and still have right/left POI shift at distances. This is particularly true of Rems and other off the shelf OEM guns. Also true for many so called “Custom” guns built by ppl who think action/chamber alignment only. Every barrel bore has a bow in it. No bore is perfectly straight. Even with the barrel chambered and mated to the action perfectly, if the muzzle/bore variation is not indexed perfectly in the vertical alignment then a 100 yard windage zero can be off by MOAs at 1000 yards with a perfectly set up scope. In other words the scope is tracking 6 to 12 O’clock but the muzzle is pointed 7 to 2 O’clock. Your POI will be farther to the right the farther you shoot. I use my jig to align the scope to where the gun prints. If I’m level but the gun shoots 1 moa right at 1000 I use my jig to move the scope to match the barrel. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Scope Not Level With My Action
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