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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Talley one piece- My lapping experience
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<blockquote data-quote="bruce_ventura" data-source="post: 754417" data-attributes="member: 34084"><p>260nut, </p><p></p><p>That's an extreme case of poor ring alignment. I expect a poor base fit on Rem 700 actions, but that's really bad. You did the right thing by lapping. </p><p></p><p>If you hadn't lapped the rings you would have had problems later. Either the scope tube would have had severe stress when you torqued the ring screws down, or the scope would have had less than 10% surface contact with the Tally base, or both. Its likely you would have seen a shifting point of aim with temperature changes, and the scope would have slipped under recoil, making the ring marks even worse. . </p><p></p><p>One alternative was to bed the bases, but that's not easy with two piece bases. You have to mount both bases on a tube to keep them aligned during epoxy set. You still would have needed to lap the rings. </p><p></p><p>FYI, Tally integral bases are machined from extruded bar stock. The cylindrical ring surfaces are extruded, not machined. You can see the extrusion marks on the ring surfaces. I always lap Tally integral bases, even when they are aligned well. It's pretty obvious when lapping that the ring surfaces were not machined.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 754417, member: 34084"] 260nut, That's an extreme case of poor ring alignment. I expect a poor base fit on Rem 700 actions, but that's really bad. You did the right thing by lapping. If you hadn't lapped the rings you would have had problems later. Either the scope tube would have had severe stress when you torqued the ring screws down, or the scope would have had less than 10% surface contact with the Tally base, or both. Its likely you would have seen a shifting point of aim with temperature changes, and the scope would have slipped under recoil, making the ring marks even worse. . One alternative was to bed the bases, but that's not easy with two piece bases. You have to mount both bases on a tube to keep them aligned during epoxy set. You still would have needed to lap the rings. FYI, Tally integral bases are machined from extruded bar stock. The cylindrical ring surfaces are extruded, not machined. You can see the extrusion marks on the ring surfaces. I always lap Tally integral bases, even when they are aligned well. It's pretty obvious when lapping that the ring surfaces were not machined. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Talley one piece- My lapping experience
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