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Lapping corrects angular errors between the ring sets, bedding does not.
The rings have tolerance errors, and usually are painted inside and out. This results in the inner surface of the rings not making complete contact with the tube, and/or putting torsional stress on the scope tube.
If the scope tube is flexed when the rings are torqued, you have created a spring which can move when the mount expands/contracts with temperature changes. That can cause problems with grouping if the receiver warms up during use.
ALL scope rings have tolerance differences, and mounts will always induce some minor mis-alignment of the rings. The only way to be 100% certain that the rings are in perfect alignment is to lap them.
The rings have tolerance errors, and usually are painted inside and out. This results in the inner surface of the rings not making complete contact with the tube, and/or putting torsional stress on the scope tube.
If the scope tube is flexed when the rings are torqued, you have created a spring which can move when the mount expands/contracts with temperature changes. That can cause problems with grouping if the receiver warms up during use.
ALL scope rings have tolerance differences, and mounts will always induce some minor mis-alignment of the rings. The only way to be 100% certain that the rings are in perfect alignment is to lap them.
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