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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Lapping a used scope
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<blockquote data-quote="LouBoyd" data-source="post: 616626" data-attributes="member: 9253"><p>It's not to late. It's not a static situation. </p><p></p><p>If the point of impact seems to be moving with shooting then lapping the rings may help accuracy. Think about what the problem really is. The scope base can cause similar problems. Check both before doing anything. Bedding is adding material while lapping is removing material on mating surfaces. Both have the objective of eliminating gaps and warping when the surface are clamped together. You need to choose which will work best for each mating surface. </p><p></p><p>Lapping anything with an anodized or blued surface will reduce it's value. Lapping is usually done on the least valuble surface if it's practical. Bedding is usually applied so it's permanent to the least valuable surface and removable from the other. </p><p></p><p>The purpose of lapping or bedding is so the scope line of sight and bore don't change their relative angle when the gun is in use. Firing does two things. It flexes all of the the component (action, base, rings, and scope) slightly and they should all return to the same positions. If they don't fit well then can return to a different position with any shot. The action also heats and expands from each firing and cools between firings. So does the base, rings, and scope, but not at the same time or achieve the same temperature. Aluminum expands 2-3 times as much as steel for the same temperatures, but rifle components aren't exposed to the same temperatures. The two main heat source while shooting are heat conducted from the propllant though the case and action and direct solar energy. Either can be larger. In Arizona I've had rifles get too hot to touch without shooting them. The scope can be hotter than the action. Likewise In winter the scope can stay cold while the action heats from firing. Lapping and bedding does not eliminate the stress of recoil or the thermal stresses, but good symmetrical fits will minimize the angular offset between the scope and bore.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 616626, member: 9253"] It's not to late. It's not a static situation. If the point of impact seems to be moving with shooting then lapping the rings may help accuracy. Think about what the problem really is. The scope base can cause similar problems. Check both before doing anything. Bedding is adding material while lapping is removing material on mating surfaces. Both have the objective of eliminating gaps and warping when the surface are clamped together. You need to choose which will work best for each mating surface. Lapping anything with an anodized or blued surface will reduce it's value. Lapping is usually done on the least valuble surface if it's practical. Bedding is usually applied so it's permanent to the least valuable surface and removable from the other. The purpose of lapping or bedding is so the scope line of sight and bore don't change their relative angle when the gun is in use. Firing does two things. It flexes all of the the component (action, base, rings, and scope) slightly and they should all return to the same positions. If they don't fit well then can return to a different position with any shot. The action also heats and expands from each firing and cools between firings. So does the base, rings, and scope, but not at the same time or achieve the same temperature. Aluminum expands 2-3 times as much as steel for the same temperatures, but rifle components aren't exposed to the same temperatures. The two main heat source while shooting are heat conducted from the propllant though the case and action and direct solar energy. Either can be larger. In Arizona I've had rifles get too hot to touch without shooting them. The scope can be hotter than the action. Likewise In winter the scope can stay cold while the action heats from firing. Lapping and bedding does not eliminate the stress of recoil or the thermal stresses, but good symmetrical fits will minimize the angular offset between the scope and bore. [/QUOTE]
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Lapping a used scope
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