Explosive rounds might be the problem.
I was doing headshots with a Her Fury on bosses in CoE and when I used one with explosive rounds I noticed I did over 2000 less damage per critical hit.
I switched to the one without explosive rounds and was back to 11995 per critical.
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The non critical damage of explosive rounds does not always show up in scope but it will make total damage for each round at least as much as non-explosive rounds and at times it can hit for significantly more damage.
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I re-tested and posted new results above. Check it out.
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It will do less Critical damage, but will simultaneously deal non-crit body damage. Add the two for total damage per shot.