People report things like transfer bars breaking, grit or grains of powder under the ejector star, bullets jumping crimp, primers locking up the cylinder, and so on.
Not to turn this thread in to a "revolver vs autoloader" argument, but I think that revolver failures reported here are greatly exaggerated, to say the least.
Yes, transfer bars can break, but it certainly doesn't happen very often.
Probably no more often than slide-stops or extractors breaking on autoloaders.
And when you talk about grit or grain under the ejector star, that's practically unheard of with a clean gun firing a cylinder full of rounds.
It typically occurs during a reload after the initial cylinder full have been shot, and even then it's rather rare, especially with the cleaner shooting ammo produced today.
Bullets jumping crimp....I've never seen that one happen with any production ammo.
And I've only seen it once in my 42 years with a handload.
Again, very rare.
High primers should never be a problem unless the guy who loaded the gun never took the time to inspect his ammo.
Not very likely at all.
After all, when you only got 5 or 6 bullets, you're not likely to let a bad one get pass.
Nearly all experienced autoloader shooters know exactly what you mean when you say "tap-rack-bang drill"....ever wonder why?
Because nearly every experienced autoloader shooter has had to perform this drill before.