You can search for Slamfire's posts on the subject and hear all the worst.
It is my understanding that a brittle action can go a long time shooting good ammunition. It is when it gets bad ammunition that things get ugly.
The sudden shock of gas released into the action by a blown casehead will demolish one (and maybe the shooter) where a good receiver will either stand up or just be bent.
How do you know your ammunition is right, sound brass and no overloads?
Well, it has been so far so it will always be?