Goon,
OK, so this is one of your criteria for the reliability of a gun. I haven't heard of this particular test before but then there are alot of things I haven't heard of. So what you are doing is handcycling a magazine of rounds through the gun as fast as you can to make sure they all fully extract and eject as they should. If some ammo doesn't then the gun don't pass the test.
Hopefully you're titling the gun to the right as you do this. Same as you'd do in an actual drill.
I picked up some of my 9mm ammo laying around and measured the OAL. Various brands measured from 1.165" to 1.045" in length. The longest being some ball ammo. Ball is generally longer than hp. Some spec snap caps I have measure 1.096 in OAL.
I want to suggest a couple of things: Pick up some snap caps. Go to the range with some of the ammo you have questions about. Mix the snap caps randomly with the ammo in a mag. Measure the length of the snap caps and the ammo. Practice clearance drills. This may eliminate any problems potentially caused by your handcycling.
The P226 has a pretty generous ejection port. Take a set of dial verniers (you can get a cheap set at Sears if you don't have one, they will do the job) and measure it. Measure the ejection port of a number of other guns (it's bigger than the 1911 and the BHP for example). Compare them to the length of the 9mm rounds you have.
Try your hand feeding test on some other 9s that are your buddies, or on a rented gun at the range.
In the case of an ammo failure followed by tap-rack-bang, you would instead be met with tap-rack-jam.
In which case you have the rack the slide a couple of times rapidly, while the gun is tipped to the right and downward. You may also have to lock the slide back and drop the mag to clear the jam. It's also best to run and hide somewheres if the jam can't be quickly cleared.
Or worse yet, what if the ejector managed to get enough of a smack against the primer with all that strange force going on down in there?
Might just lose some fingers..
Well I suppose anything can happen with the "strange force" and all but I have not heard of this one. It's not likely, but maybe not impossible I suppose. Likely you would not lose any fingers.
Sigs are very reliable guns, they are known for that. Using your test you've found "problems" with the two you own. They have not given you problems at the range you say, when you are actually shooting them. But their "failure" to pass this criteria you've set up is annoying to you.
I think you're overthinking the problem. I doubt I can convince you of that though and so I made the suggestions I did above, the snap caps and measuring and all, so that either you convince me or you figure out something else out on your own. Look at the open top slides of the Berretta's. I mean no offense by what I say.
tipoc