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I'm not sure why that happens on a cold bore, but I've found it to be consistent across the sub loads I've tried in 308 and 300W. I started swabbing the barrel with a very light coat of CLP and the problem went away (or at least the difference was within the standard deviation of that load). Also, if you let the barrel cool for 10 min or more between shots, you would see less deviations.
My guess is that a cold bore diameter is more/less than a warm bore diameter, but that may be too simple of logic (warm steel expands aka the lands expand into the bore rasing the pressure).
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Threaded Mode