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Interesting, your results are exactly opposite of what I typically get with sub loads of all calibers. I typically get a slower velocity on the cold bore, then higher on the subsequest shots.
Not sure what the issue is, but I recommend delcaring it doesn't matter. If you are going to hunt or try to punch little groups and need the dope, drop to 11.2-11.4 gr and then test with a cold bore & clean barrel, testing a single shot at a time allowing the barrel to cool for at least 5 min with the chamber open. When you get a good sample of velocities to establish an average, move on to testing the variations on follow-up shots.
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