Well...what he was looking for was a scheme to avoid "double charges"...not necessarily squib loads...
Seriously tho... there are some good ideas here. I find the lockout die to be a bit much, but the various powder checker dies are good tools... they detect high and low charges... if you have a space on your loader that is a good use of it.
But... I don't think that any scheme is foolproof as you so aptly pointed out....Any tool or method is just that ... just a tool. You still have to use it in a way that makes sense to you.
I personally know competitive shooters who have Dillon equipment (what else?) set up with an audible powder checker die... and on the last station is a factory crimper die...
Then... they weigh every finished round on a digital scale to check for high, low... or no powder... THEN... they insert every round into the chamber of their barrel to make sure that they will chamber!
Do I think they are excessive????
No... I think their methods are merely born of experience. They check, double then triple check. ..Then they are pretty confident their ammo is not going to be a problem. With all the pressures of competition, the last thing they need to worry about is out of spec ammo... now they can concentrate on sight alignment and trigger release with no distractions.
I pretty much check, double check, triple check.... and then one more final check until I am satisfied that I got it right.
Am I excessive... Sure ... I admit it ... I want every round of ammo I load to be as perfect as I can possibly make it....because mistakes can and do happen even to the best of us...
Here... check out this thread...it is an eye opener...
http://www.thehighroad.org/showthread.php?s=&threadid=67867