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Some guns just don't like certain ammo, no helping it it seems. My M&P9c eats everything, including the WWB with no problems. No FTE so far.
But yeah, bitch to Win and get some free ammo. Then sell it because it looks like your SR9 won't be taking those.
Assuming the lot number is the three groups of numbers printed on the inside end flap of the box, mine was:
Will post a picture when I work out some hosting.
Given that this was ejection problems, not failure to fire, you either have brass thats out of spec or an issue with the extractor in the pistol.
I'd bet its the pistol, and for whatever reason it's showing up first with WWB.
with WWB - you get what you pay for. its still decent enough for plinking and practice.