Interesting choice this one. I would assume that this has more to do with someone getting the palms greased. I suppose the ballistics of the 9mm has closed the gap with 357 Sig. Or that the 357 Sig is becoming less common, and more expensive to keep buying. I don’t see the practical advantage of switching from 357 Sig to 9mm our side of a small margin of capacity. I may also have a lot to do with field agents not in the protective detail for the POTUS not doing well with a hot 357 Sig load. All speculation on my part, but it’s better BS fodder than gun control talk.