Your brass is fine until it starts splitting. With a revolver it is better supported than any semi auto and you get your strength from the cylinder, not the brass. I would polish the chamber.
Are you cleaning your brass when you reload it? Are your chambers clean? Do freshly sized case go in easy? I would think that if they were too long they would be hard to fully insert into the chamber.
My rifle and pistol are tools, I am the weapon.