Realize that a fold/pie crimp 2 3/4" shell will have a"Loaded" length of about 2 3/8". The 2 3/4" is the fired length with the crimp open. You will not feel any resistance when loading the shell even in a 2" chamber, much less a 2 5/8" one.
A roll crimp shell will not shorten much over 1/8" when crimped so chamber length is much more critical on them. "Never" fire shells which are actually pushed into the cone in their loaded condition.
A pie crimped 2 3/4" shell should probably not be fired in a 2 5/8" chamber having a cone length of less than about 3/8" nor in a 2 chamber with a cone length of less than about ".
DO NOT shoot shells longer than the chamber if it has a very abrupt cone or a step where the end of the hull actually opens out into the bore itself.
