i try to stay very close- i also find it is not unusual for a bushing to throw something different from the chart
part of the reason is the operator and/or the press- if you tend to hit the bar hard to move it you will get a different charge than the guy who gently slides it from side to side.
i try to be consistent with the movement - and I several throws to get an average of the measurement
if there is more than a slight (tenth or so of a grain ) difference i can modify the bushing by adding a little tape inside or a light filing and polishing
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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