With an even number of lands and grooves, calipers provide an educated guess. A slug would fine tune this to real knowledge in like 5 min.
or you could order 100 pcs of:
+0.000
+0.002
+0.004
but then you would wonder if the odds were better and order .001 and .003!
So, the $15 kit for slugging the bore gets lots cheaper.
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