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Scope lapping for precision - Anyone do it?
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Site Supporter   Location: Mason/Kitsap County Demilitarized Zone Joined: Wed Aug 7, 2013 Posts: 4543 Real Name: William Foster 
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Tagging. I have a 700 ADL in .308 needing a scope
Sent from my Y538 using Tapatalk _________________ "To the last I grapple with thee; from hell's heart I stab at thee! For hates sake I spit my last breath at thee! " Capt. Ahab I have never been, am not, and will NEVER be an NRA member. They sold me out a dozen times, just like they have you! "while CZ, SIG, FN, and Izhmash (hum...) are playing Hardball, American manufacturers are too busy playing Lawyerball." Want High end Russian military gear? PM me!  |
| Sun Dec 10, 2017 3:24 pm |
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Site Supporter  Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21268 Real Name: Vick Lagina
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a variation on Deadshot's method. It would seem this guy's method would introduce stress on the mount before the bedding sets.
Of note, though, is that he also beds the rings https://gundigest.com/gear-ammo/optics/ ... ange-rifle _________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith "The “A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli Láodòng zhèng zhūwèi zìyóu FJB |
| Sat Oct 03, 2020 7:52 pm |
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Site Supporter  Location: RENTON Joined: Fri Mar 25, 2011 Posts: 20771 Real Name: John
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Necro thread....
 _________________ Mr. Q wrote: so basically, if you have to smoke some asshole, make sure they become fertilizer and then Bounce? got it. Guntrader wrote: Huh, maybe I was an asshole. NRA Member/RSO SAF 5 Year Donor GOA Member |
| Sat Oct 03, 2020 7:57 pm |
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Site Supporter  Location: Redmond Joined: Wed Jul 22, 2020 Posts: 975
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I can't imagine this is necessary anymore with modern machining and QC on high quality rings, mounts, and high quality scopes. The grip of your rings is also a function of the tube of your scope. While your lapping bar might be perfectly concentric and circular, if your scope tube isn't your perfectly circular rings will still be trying to grip an imperfect scope tube.
You are also removing the finish or hard anodizing on the mounts which would make it easier to scratch or oxidize causing other issues down the line. |
| Sat Oct 03, 2020 8:44 pm |
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Site Supporter  Location: central wa Joined: Mon Mar 21, 2011 Posts: 3554
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Help me understand how to calculate, for my particular setup:
What is the benefit, in moa or other measurement, per unit of lapping (say, one hour)? What is the downside risk? Can damage greater than potential benefit be done if I screw it up? I ask to learn. |
| Sun Oct 04, 2020 5:46 am |
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Site Supporter Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21268 Real Name: Vick Lagina
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The benefits extend to the tracking of your scope. Undue stress on the tubes can affect the tracking i.e. the accuracy of movements when adjusting the turrets for a really long shot, and then returning to zero since there is tension on the elevators from a crimped or bent tube.
This tension can/will affect the life of the elevators too, if you use them to make your long shots. (if you're using hold offs...well, then maybe you don't need those fancy turrets?) Some of the benefits are strictly cosmetic. when switching scopes to different rifles, it may require different spacing of the rings and the old positions may show marks from where the unlapped rings dug in. My un-learned opinions... feel free to correct. EDIT: Try a scope tracking test. Here's one you can do without going to the range: https://gununiversity.com/indoor-tall-t ... king-test/ EDIT 2: I made a tall target myself calibrated for 100 yards on some cardboard. It's easy cheap and fun. You can also make a square target and see how it tracks up, down, left, right and return to zero. _________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith "The “A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli Láodòng zhèng zhūwèi zìyóu FJB |
| Sun Oct 04, 2020 6:13 am |
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Site Supporter Location: central wa Joined: Mon Mar 21, 2011 Posts: 3554
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jukk0u wrote: The benefits extend to the tracking of your scope. Undue stress on the tubes can affect the tracking i.e. the accuracy of movements when adjusting the turrets for a really long shot, and then returning to zero since there is tension on the elevators from a crimped or bent tube. This tension can/will affect the life of the elevators too, if you use them to make your long shots. (if you're using hold offs...well, then maybe you don't need those fancy turrets?) Some of the benefits are strictly cosmetic. when switching scopes to different rifles, it may require different spacing of the rings and the old positions may show marks from where the unlapped rings dug in. My un-learned opinions... feel free to correct. EDIT: Try a scope tracking test. Here's one you can do without going to the range: https://gununiversity.com/indoor-tall-t ... king-test/ EDIT 2: I made a tall target myself calibrated for 100 yards on some cardboard. It's easy cheap and fun. You can also make a square target and see how it tracks up, down, left, right and return to zero. Thanks! |
| Mon Oct 05, 2020 5:18 am |
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