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This is an interesting thread, and one that should be read by a lot of new or mid-level shooters.
As an ex-academic that taught graduate level spatial probability and statistics years ago it always bugged me that people associate accuracy with the size of their groups. The size of of a group, or mean radius or whatever is the populate reference is really a function of repeatability which is a function of variance. But it's not accuracy.
That is, you could fire a very tight group (one with only small variance between each shot landed) but they all could be wide of the intended mark, or the target center.
Is that accurate? No, not really. Said another way, if you consistently missed your target placing shot after shot in the same hole it would be true that you are consistent, low variance, extremely repeatable. But you'd not be very accurate.
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