Something to consider. If a stock does not have pillars or an aluminum chassis/action block, torque will compress the stock material. If this happens, often the front action screw winds impacting the rotation of the bolt by dragging or blocking the bolt lug from turning. If your stock is all plastic i would at least try to find a washer to put under the screws to reduce the extrusion of plastic under the screw.
I think your on the right track with your numbers but again, success is relative to the stock material and if it has pillars. Good luck
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