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I have the extractor, but not the trigger. I am going to look into that one of these days. Heard nothing but good things. In the meantime, I polished mine up a bit. Haven't had the chance to try it out, but it felt good with a dummy round.
I've had these problems with my 597 HB, an out of battery, and a burst of 2 or 3 shots, both times the rifle was overdue for cleaning. Mines in an arch angel stock, and sometimes goes long on cleaning because it's a pain.