Sellier & Bellot 124gr FMJ
Federal 147gr +P HSTNote that the S&B is traveling the same velocity, roughly, as the lighter 115gr Blazer Brass. It's still fairly mild shooting, being some 70fps slower than various 124gr Fiocchi or Winchester Q4318 "NATO" loads I've tried out of comparable test guns.
All thirty rounds fired without a hitch. A reader informed me that Steyr had changed the extractors in these, and so that's an issue I'm going to look into given the last range session's FTEs.
This makes 330 rounds fired through the Steyr C9-A1 without cleaning or lubing, with one failure-to-fire (#8), three failures to extract (#234, #266, #276), and one failure to go completely into battery (#116). 1,670 rounds left to go.