Edgar,
I've rechecked some of my shells, my jig cuts them 2-9/16 not 2-1/2, my mistake. The idea was to load the shells just like a 2-3/4" shell and just before crimping drop an overshot card on the shot charge so the shot would not fall out when the finished crimp was done with the hole that was there from the shortened shell length. With 12 and 16 gauge, it works just fine. I had forgotten that with 20 gauge, it ended up almost like a roll crimp.
I found a pair of factory 28 gauge loaded shells on my loading bench from somewhere and measured the loaded shell length and you are right, there is no room at all for any kind of crimp. Sorry for the confusion.
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