First, the Prvi Partizan...
PPU 124gr FMJSlower than the Blazer Brass, but not by much, and with a heavier bullet, these rounds functioned the weapon just dandily.
TulAmmo 115gr FMJSo, a pretty wide velocity spread, but the slowest was as fast as the fastest Blazer Brass, and the fastest TulAmmo round was a good bit faster than that.
It wasn't all sunshine and buttercups, though...
This makes 530 rounds fired through the Steyr C9-A1 without cleaning or lubing, with two failures-to-fire (#8, #472), three failures to extract (#234, #266, #276), and one failure to go completely into battery (#116). 1,470 rounds left to go.