Just got my M9. Tried out an old favorite for my CZ, 147gr, 3.3gr Titegroup. Lots of FTE's. The M9 is new so maybe it needs breaking in. Next I used 125gr. Zero JHP with 4.2gr. Titegroup at 1.13 O.A.L. These would not chamber. Just loaded some of the 125's at 1.115 O.A.L. Going to try these tomorrow. It seems the M9 does not like wimp loads or certain bullet shapes [like the Zero 125's]. No problems with the WW white box.