Something interesting posted in Tactics and Training column of American Handgunner:
"I thought it was dead, gone, outta here and busted — thoroughly busted. But apparently not. Catching the ejected round, that is. And by “catching” I mean either letting it pop up in the air and catching it, or letting it drop into a cupped hand held over the ejection port as the slide is withdrawn. I recall catching the round, particularly via the latter method, as pretty much SOP back in the ’80’s. Sometime in the mid-90’s, at least in law enforcement firearms training circles, it pretty much became verboten.
The reason given at the time, and one I still believe is valid, is there is a possibility your cupped hand could wander too close to the ejection port, interfering with the round’s path out of the pistol. Sometimes that interference, coupled with the force of the extractor pulling the round backward, could wind up with the round’s primer being thrust powerfully into the ejector. This might cause a detonation of the round, and the likewise predictable injury to the owner’s hand.
Another possibility is the hand over the ejection port could cause the round to partially stay in the chamber while at the same time the user fails to lock open the slide. When he lets it go, it moves forward under spring tension, capturing the round in such a way the forward-moving extractor hits the primer. In fact, these exact sequences of events have happened. Several cops in just my neck of the woods have seen these things or experienced them, so it’s now a known risk.
What Should We Do?"
For the Rest Of The Story: http://americanhandgunner.com/to-catch-or-not-to-catch/