Lapping question (Gun tech)

RiverOtter

RiverOtter

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I'm lapping my scope rings and the instructions say to lap until about 75% of the finish is removed. My front ring is around 80% and the rear is only around 60%. Do I STOP or keep going until the rear is 75%.

My other question is "Rosin Powder". I have looked at all the weightlifting and rock climbing shops and no one seems to know about this stuff. They keep trying to sell me powder chalk, which only absorbs moisture(as far as I know). Anyone know where else I could look.

RO :)
 
RiverOtter said:
I'm lapping my scope rings and the instructions say to lap until about 75% of the finish is removed. My front ring is around 80% and the rear is only around 60%. Do I STOP or keep going until the rear is 75%.

My other question is "Rosin Powder". I have looked at all the weightlifting and rock climbing shops and no one seems to know about this stuff. They keep trying to sell me powder chalk, which only absorbs moisture(as far as I know). Anyone know where else I could look.

RO :)
Click to expand...

What make of rings?
What "pattern" are the rings lapping in at... are the front of the rings tilted up or down in relationship to each other? Or are they tilted to the sides? It is quite possible you may need to bed the bases or line them up better so the rings are more square to each other and then it takes very little lapping to finish the job.

If you lap and get full contact on the bottom ring halves you really don't need any powdered rosin to hold the scope in place. I just do it anyways...
 
There Leupold STD rings.

The front ring is lapping fairly even throughout except a small patch at the left rear (looking down on the action with the butt facing me)

The rear ring is lapping front half right and rear half left. Very little finish remove in bottom center. Picture a square divided into four equal quadrants with the top right and bottom left square shaded(lapped)

I just don't want to over lap, as I'm sure that is a possibillity.

I hoped I described it well enough to help you help me.

RO :)
 
RiverOtter said:
There Leupold STD rings.

The front ring is lapping fairly even throughout except a small patch at the left rear (looking down on the action with the butt facing me)

The rear ring is lapping front half right and rear half left. Very little finish remove in bottom center. Picture a square divided into four equal quadrants with the top right and bottom left square shaded(lapped)

I just don't want to over lap, as I'm sure that is a possibillity.

I hoped I described it well enough to help you help me.

RO :)
Click to expand...

See if you can get the rear ring to sit more square in the two windage clamp screws.. then do the best you can.... I don't think you will lap too much, very little material is being removed.
 
I adjusted the rear windage ring and finished lapping. The front ring is about 98% bearing surface and the rear is around 80%. I took it to the range and at 25 yards the POI was 4" right and 3" down. Is that a decent starting point for a freshly mounted scope? I know I have seen worse, but it has been so long since I last mounted a scope that I can't remember what the general shot placement of a new centered/mounted scope was. Would you play around more with bedding to achieve a better "centering" or just adjust the scope to compensate?

RO :)
 
Thanks guntech ;)

'Otter I personally would be satisfied with the biggest adjustment being 8 MOA! I just mounted up a new Nikon for instance and noted that the scope would adjust predictabley they claim up to 40 moa each way, 80moa total.
 
I misread RO. I had it that you were at 50 yds. Getting a little dicey maybe. Mind you I just wound mine about 20 moa to zero (half of what Nikon says is doable/reliable) and its shooting gangbusters so I think I'll leave it alone.
 
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