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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Can I reuse lapped rings on new gun and scope
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<blockquote data-quote="ntsqd" data-source="post: 2375489" data-attributes="member: 93138"><p>I will suggest that those who say that modern rings don't need to be lapped are putting too much faith in the ring mfg's marketing. I have lapped modern, "precision CNC made" rings and the wear pattern resulting indicates quite clearly that they were neither round or truly aligned. Unless the ring mfg uses a Sunnen CK-10 hone or similar to set the final ID of the rings I'm going to lap them because I know that they're not as round as I'd like. Then we get into how the bases or the rail will throw off their alignment. So even honed bore rings on a bedded rail may <strong><em>still</em></strong> need to be lapped or bedded to make them align correctly.</p><p></p><p>Bedding the bases or the rail to the action should not even be up for discussion. Just do it.</p><p></p><p>Those tapered point "alignment bars" can lie to you and not even know that they're doing so, and neither will you. The bore centerlines can intersect and still not be coaxial. The front bar could be pointed down .005 degrees and the rear bar could also be pointed down .01 degrees and if you happen to place the bars just in the right spot the points will align and look like they're perfect when they are not. Very lightly lapping the rings together with a single bar will create a wear pattern in the bores of the rings. From that you can read how good or badly the rings are aligned and then decide how to correct them.</p><p></p><p>Some will lap until the wear pattern indicates that the bores are aligned. Others will bed the scope in the rings. I don't think it really matters how you get to straight, round, aligned scope ring bores as long as you get there.</p><p></p><p>Unless this level of preparedness is too far down the rabbit hole for you, then don't bother.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2375489, member: 93138"] I will suggest that those who say that modern rings don't need to be lapped are putting too much faith in the ring mfg's marketing. I have lapped modern, "precision CNC made" rings and the wear pattern resulting indicates quite clearly that they were neither round or truly aligned. Unless the ring mfg uses a Sunnen CK-10 hone or similar to set the final ID of the rings I'm going to lap them because I know that they're not as round as I'd like. Then we get into how the bases or the rail will throw off their alignment. So even honed bore rings on a bedded rail may [B][I]still[/I][/B] need to be lapped or bedded to make them align correctly. Bedding the bases or the rail to the action should not even be up for discussion. Just do it. Those tapered point "alignment bars" can lie to you and not even know that they're doing so, and neither will you. The bore centerlines can intersect and still not be coaxial. The front bar could be pointed down .005 degrees and the rear bar could also be pointed down .01 degrees and if you happen to place the bars just in the right spot the points will align and look like they're perfect when they are not. Very lightly lapping the rings together with a single bar will create a wear pattern in the bores of the rings. From that you can read how good or badly the rings are aligned and then decide how to correct them. Some will lap until the wear pattern indicates that the bores are aligned. Others will bed the scope in the rings. I don't think it really matters how you get to straight, round, aligned scope ring bores as long as you get there. Unless this level of preparedness is too far down the rabbit hole for you, then don't bother. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Can I reuse lapped rings on new gun and scope
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