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Bed or Lap Scope Rings?

I'd check the diameter of your scope tube again the diameter of your lapping bar and the accuracy of your torque driver/wrench.

Assuming you lapped correctly to begin with that should never happen.
 
There is really a lot more to this than size of the cartridge.
Scope night above bore, weight of scope, free recoil or some combination of touch/pressure, actual amount of surface contact between tube and rings, to name a few.
Regards
CW

Not really. That’s a light recoiling round. Very light and that isn’t very high for height above bore. What scope is it? I have mounted scopes over 3 pounds on 300WM and never had them move. You probably took out too much of the surface area.
 
FWIW, the 'breakway' force for most guns is around 9 G's. That means that a 2lb. scope will 'weight' 18 lbs. for the brief instant before the gun starts to move in recoil. In a lighter gun that recoils more, the G forces diminish very rapidly. In a heavier gun with a smaller cartridge, the scope can actually experience more force as the gun moves less and doesn't dissappate the G's like a gun that moves a further amount.

If those rings are Melonited, that's an extremely slick surface even after being lapped. Bedding the tube will get ahead of this.

Good shootin' -Al
 
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Years ago I bought a 700 bdl in 223 at a local shop. Bought a quality scope at the same time. The shop offered to mount the scope for an additional 20 dollar fee and I let them. I shot it at our local range and couldn't get it zeroed. A way more experienced shooter took pity and offered to help. We finally decided to take the scope off and when the front ring was loosened the scope actually lifted a bit. The rings were off that much. He offered to take care of it and explained lapping rings and the importance of starting with quality rings to start. He was kind enough to show me how to do it and I've been a believer ever since. Just one less thing to worry about.
 
Once you have the tools and learn how, from that point forward you can know that all of your scopes are mounted correctly. I like knowing how to do things correctly, and being able to do my own work when I can. I have observed that this is not universal among all shooters, and that is OK. As a matter of fact, I have met some really good guys who should be barred from touching any rifle with a tool ;-)
 
If you read that they are acknowledging that the receiver or bases may not be perfectly machined even if the rings are. That's the whole point of checking things with a lapping bar.

If you find the rings aren't aligned and you want to chase the 'what's not perfect' rabbit, you can do that. Or you can lap the rings to fit the combination you have.
 
The good folks at NF customer service told me all kinds of bull squirt when I had a scope problem.

The dipshit asked me what rings I was using and I told him they were Kelbly rings on an f-class panda with an integral rail.


His reply, “never heard of them, if you want good rings by NF”.
That was my last conversation with that outfit.
CW
 
nope, it was several years ago. I sold all my NF scopes except on 12-42 after that incident.
March customer service is stellar and they speak straight.

CW
When I talked to the NF rep one day he said most fellas that have problems find the answer in their own mounting system or technic. Where have we heard that before right ?

He also said to watch out for that Clay guy from Colorado ..;);)
 
FWIW, the 'breakway' force for most guns is around 9 G's. That means that a 2lb. scope will 'weight' 18 lbs. for the brief instant before the gun starts to move in recoil. In a lighter gun that recoils more, the G forces diminish very rapidly. In a heavier gun with a smaller cartridge, the scope can actually experience more force as the gun moves less and doesn't dissappate the G's like a gun that moves a further amount.

If those rings are Melonited, that's an extremely slick surface even after being lapped. Bedding the tube will get ahead of this.

Good shootin' -Al
My rings are Melonited, and I believe you hit the nail on the head.
I plan to bed them with Pro Bed 2000 and dust the rings with a little rosin for insurance.

CW
 

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