I have seen military documentation stating that some of the complaints with the FA 06 cartridge were what was considered severe blast and recoil.
another problem was bullets being pulled by their inertia. Some examples of the cartridge even have stab crimps in an attempt to stop their movement. I have personally seen four versions of the round. Some have a canelure, some are not head stamped at all, and one sample has an almost perfectly hemispherical nose. There were no comments on ejection problems.

Ken