In by gone days this information was available from charts that the scope base and ring manufacturers gave dealers. Haven't seen one for quite some time but maybe an older dealer/store/gunsmith might still have one. I know both Leupold and Weaver had them as bases had too be radius on the bottom side for proper fit. Since barrel shank diameter is a little over 1" I would speculate the receiver is around 1 3/8" diameter.
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