Receivers of production rifles often have a height discrepancy of a couple of thousands of an inch.
Where at what point do we begin shimming of the base. Is it at 2/1000, 5/1000 or 10/1000 height discrepancy?
How many of us actually check with a feeler gauge What the difference is and just put the bases and rings on, Drop the scope in, tighten and go shooting.