So I've been gone for a while but I am happy to say I'm back.
One of the things I've been having a lot of fun with is converting .303 into .410 shots shells, but I've run into an issue: after 3-4 reloads the case has swelled so much that it is almost too tight to fit into the chamber and makes it very hard to cycle in my old bolt action shotgun.
Do you masters of the reloading word have any suggestions about resizing the brass shotgun shells?