Thanks for this.
I've carried it for some time. My HKs (and I) handle it well, but if there is no major advantage over the plain 147gr or 124gr +p, I may just go back to one of those and negate the additional muzzle flip that it causes. Not that it's not unmanageable, but if there is no real advantage, then I don't see a reason to carry it. It can go into my "rainy day" stash.