My good 2 go ammo has been Sellier/Beloit for a very long time, nothing fancey but it all runs great in every rifle/handgun I own, very little change in FPS and it is very nearly as accurate as the `HIGH` and gucci ammo that is out there , im shocked as all heck with the tight groupings I always seem to get, well I am after all a bolt action ninja God, lolololol, not really.
I have used PMC, but find it tends to be dirtier for cleaning. Seems like a number of people like S&B, so may look into that.
I can't say for sure it's anything other than their 9mm, but Sellier & Belloit for reloading is extremely stiff to resize. Primers punch out harder, and are harder (almost scary) to seat new primers. So much so that in the past, I've passed on S&B 9mm brass and actually sorted it out of the range brass I've picked.