As Brian and others have stated this will be debated until the end of time.
I believe Julia's is quite consistent in the standard they use to judge CCH. I feel they state the % of CCH as a percent of the total area ( includes the water table and breech faces) . Therefore, as an example a gun with 90% CCH will typically have no case color on the trigger plate. If the CCH is faded they will state that. The problem as stated is there is no "industry standard" to express the level of CCH.
It would be better and helpful if the % of total coverage was one expressed as one value and the remaining intensity as another %.
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