Lets be clear about worn out...
While it is possible to "wear out" a revolver, I seriously doubt that, without abuse, it is possible to do so, particularly in four years, no matter how many rounds you shoot.
In order to wear out a revolver, you have to wear out the
FRAME.
Shooting any gun until it is worn to the point it needs some work is NOT the same thing. The internal lockwork, the barrel, and even the cylinder are all replaceable parts. A gun that had endshake, or is out of time, etc., is NOT WORN OUT. It is just worn.
FYI, It's long been a documented fact (by S&W) that the earlier S&W M29's, like the OP's M29-2, will quickly shoot themselves loose & out-of-time with heavy-boolit .44 Mag loads (like 300gr loads).
Shooting loose, and out of time are worn, but not worn out.
Personally, I don't use, and never will, the 300gr loads in the .44 Magnum. There's no point to them, in my life. If you like them, fine, but not for me.
For decades, the heaviest standard bullet in .44 cal was a 265gr, (designed for, and loaded in the .444 Marlin). Never heard much, if anything about the early S&W's durability until people began running loads through them that the gun was never designed to handle.
Kind of like running your car (designed for 87 octane gas) on 100+ octane aviation fuel. You'll get some good results, for a while, but it won't last nearly as long, before something needs work.
There is no law, or rule that says every gun has to last forever with all possible combinations of ammunition. And even guns worn to the point they are not safe to shoot can often be repaired. If the frame isn't damaged, they can be rebuilt, no matter what else is worn out.