I am curious. What is the flaw with measuring outside to outside and subtracting the actual measured diameter of a single pellet hole, of the caliber that the group was shot with?
Another thing, if you ask a question, and someone gives an answer, you might want to simply take note of his opinion, and go on, rather than getting so emotional. Opinions vary. That is only natural. I am sure that the fellow that wrote of fairness was not commenting on your character, but simply making a comment on the suitability of a rule. As it happens, I think that not taking pellet hole size into account, on a caliber by caliber basis, introduces errors that are undesirable, and avoidable, if the goal is CTC group measurements that are directly comparable. This does not mean that you are not a fine fellow, just that I might do it differently. BTW, what is the usual range of group sizes that you typically see at a your matches? Are competitors using flags?