Chukarman,
Just a note or two to add to my above Reply.
Those 2 1/2" RST hulls and the CB6100-12 could be used to load a little heavier load with a different powder. Should be enough room. 6 point crimp.
And I did load some 2 3/4" hulls cut to 2 1/2" and used a Hardin Shot Shell crimp. If you go to the Reloading section of shotgunworld.com you show find more detail.
There's enough of the 8 point crimp left to crimp the shell nicely but you have to use an over shot card on top of the shot.
I tried to post a picture of what the end of the shell looked like but I couldn't figure out how to do it.
This link might do it:
[img]
https://i.imgur.com/0g60b5q.jpg?1[/img]