I've had my 629 for close to 20 years, and it has digested some stiff loads, most recently 300+ grain cast. I can't even see where any real wear at all has occured. If you deliberately try to wear it out with super hot loads, yes it will get loose a little quicker than say, a Ruger, but with any sane loads it will last a very long time. Good maintainance goes a long way too.