RD 1000	Actual diameter of target = 20.4"
		Most obvious reading
Distance	-1	0	1	<-----clicks
36.0	20.4	20.8	21.2
40.5	20.1	20.6	21.0
51.0	20.0	20.5	21.1
52.5	19.3	19.9	20.5
75.0	19.0	19.9	20.7
81.0	19.6	20.5	21.4
	Avg	20.4