I can't help you with experience about these new 'micros' as I have never heard of them till now.

At first when I seen you mentioned for short barrels, I thought maybe they came out with revolver loads. Such as 38spl, 357mag. I have been praying for them but to no avail.

I do have experience with there previous ones. I got a small stockpile of the 124gr +P 9mm HSTs and they are the best HPs I have ever tried. I won't into full details because I just did on another HP thread very recently where HSTs were brought up, but they would fully expand pretty much no matter what. I will share this picture again though.

If I ever wanted a good HP for any other semi auto round, it would only be HSTs.

HST_1.jpg