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One possible fix for the first round being way low is case annealing. I can't say it is the fix and the annealing kit would set you back about $45. You don't really need the kit but it is a good way to get started. Another method is to get a Lee .223 lock stud and spin it with a cordless drill or screwdriver. Lock the case in the holder, turn on the drill and put the map gas torch to it until the neck is orangey colored. If it goes red it is too hot and will fail early. Lower pressure subsonic rounds made from toughened mil brass may not be sealing. The first shot may not seal the chamber completely but with the aid of heat the subsequent shots are able to completely seal the chamber. By pushing the shoulder back further (giving extra headspace) none of the shots fully seal the chamber and therefore "smooth out" the readings but the velocity spread is higher. Not saying its the problem just one more variable to look at.
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Threaded Mode