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Old January 27, 2011, 09:06 PM   #1
mapsjanhere
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Hole spacing on Win 70 pre 64 rear scope mount

I'm trying to switch scope mounts on a Winchester 70 pre-64 in 338 WM. According to everything I've found the rear mount hole spacing is supposed to be .435, but when I pulled the existing mount the holes turned out to be spaced .395+-0.010. The front mount seems to be regulation.
Has anyone ever heard of this kind of spacing, and can give me the correct number to modify the mount I got?
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Old January 27, 2011, 09:13 PM   #2
Slamfire
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Maybe yours was drilled and tapped later.

My prewar left the factory without drilling and tapping for mounts. This was done later. I have not measured my holes yet so I am curious what the correct dimensions are.

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Old January 27, 2011, 09:22 PM   #3
mapsjanhere
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Looks just like mine, I guess you're correct on the "no factory holes".
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