David,
I received about 500 3 1/2" Federal 10 gauge hulls to reload. I cut them to 2 7/8" and the crimp was just not as good as the RST hulls I was reloading plus some of the hulls would crumple. I checked RST's hulls and they are almost 2 3/4" open. I have retrimmed all hulls to the RST length and get much better crimps and fewer crumpled hulls. The point is that the RST shells are just a fraction longer than your 2 5/8" chamber.
Harry
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