Part of the discussion here is that maybe the 125gr/.357 isn't as good as its reputation. There has been a lot made of the "street stoppers" data, and just how trustworthy it is. Taking a 125gr weighted bullet and shooting it in a semi may give the same ballistics, but may not give you the same performance - the bullet design has to be different to cycle correctly.
The FBI especially, and also other LE agencies, are making their decisions based on extensive 'scientific' testing more and more - and most of those test are now geared to deep penetration, bullet weight retention, and wider/bigger permanent wound channels.