Seekins rings on a Seekins 20MOA rail
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Lapping Scope Rings
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Lapping Scope Rings
The purpose of this post is to show that even “expensive,” precision-machined matching rings and rail will have uneven coating removal during lapping. Uneven coating removal means uneven pressure on the scope tube. Does it make a difference? Who knows? I’ve never seen a controlled study or data either way.
To shoot tight groups, which is what this rifle is for, the entire process from brass selection & prep through charge weighing, bullet seating, and shooting mechanics, is all about variable elimination. That’s what scope ring lapping is about as well, at least for me.
I don’t care how much you spend on your rings, what’s they’re made of, or whether they are dovetail, picatinny, or one-piece— they ALL look like this when lapped.
Originally posted by Outback View PostDo you lap the top rings too?
Originally posted by Outback View PostDo you lap until 100% shiney? I've never lapped rings.
Originally posted by Radar View PostThe rear one was out a little bit, how long did you have to lap?
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Lapping Scope Rings
Originally posted by trophy8 View PostShouldn’t have to lap rings of that quality. I’d send them back before I lapped them.
Two things: lapping isn’t fixing a problem with the rings, so it’s not like I did this to correct something I was able to measure or perceive before I did it. Also, EVERY set of rings will look like this after lapping, period. That is an unavoidable fact of life.
Do you expect your $3k scopes to be sighted when you mount them too?
It’s not about quality or manufacturing tolerance or flaws. It’s about accounting for all the variables on the as-installed rings, which could include things out of the ring manufacturer’s control like receiver machining, receiver hole alignment, or variation in the fasteners.
Rifle look familiar, btw?Last edited by meltingfeather; 01-13-2019, 09:28 PM.
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Originally posted by meltingfeather View PostUh... how would you know they are out before you lap them?
Do you expect your $3k scopes to be sighted when you mount them too? I’ve never understood this opinion/perspective. It’s not about quality or manufacturing tolerance or flaws. It’s about accounting for all the variables on the as-installed rings, which could include things out of the ring manufacturer’s control like receiver machining, receiver hole alignment, or variation in the fasteners.
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Lapping Scope Rings
Originally posted by trophy8 View PostI have never had to lap quality rings sitting on a quality reciever. Ever. Looks like yours is sitting on a B14 HMR? I buy quality parts for this reason. Your last sentence is why. Yes on a factory gun or a savage or Remington action on a build I understand it. I’d rather find the alignment issue and fix that before lapping high quality rings. One reason is because I move scopes from gun to gun on occasion upgrading. Changes the lapping progress you made on another reciever. Hence my reason to fix the reciever alignment instead of rings.
It could be that if I allowed charge weights to vary +/- 0.1 gr. I might still shoot great groups, meaning I don’t “have to” be that precise. Am I? Yes. If there is a variable I can eliminate I’m going to do it. There’s nothing wrong with your choice not to lap— that’s yours to make, but saying there is a manufacturing flaw with my Seekins rings based on the picture or the fact that I do lap them is just not correct.
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