Mauser fan
Member
I’m installing some Talley lightweight scope mounts onto my new Winchester model 70 featherweight and I’m concerned with the amount of misalignment I’m seeing. When I place alignment bars in the rings and torque everything to spec, I’m seeing a vertical offset of about .008”. They have good alignment in all other directions. I don’t know if this height difference is due to the rings or if the receiver has a height difference between the front and rear mount locations. Do you think this amount of offset would put excessive stress on a scope or is it within expected tolerances? I’m considering shimming the rear mount up to bring them into alignment; is this an acceptable practice?
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Shimming is an acceptable practice. The shim stock is going to be the decision you need to make brass or steel? Then make sure you torque the screws down evenly.
Then on the other hand Lapping the rings would be a better solution in my opinion .008" wouldn't remove that much material and would eliminate the hassle of losing the shim if you decide to change the bases later on.
What does lapping mean ?
In the application or use of the term Lapping. It means to remove metal or polish a surface with an abrasive such as clover compound. In this instance a solid bar that simulates the tube of a scope and covered with the abrasive compound then is mounted in the scope rings then tightened down to the desired resistance and is rotated back and forth until the results you are looking for are achieved.
Most people look for results where the scope is tight in the rings without any evidence of binding. The worst case scenario is when the tube is bent.