The ejection mechanism is more rugged than it appears. I used to see a fellow at the range with 4 incher who shot it a lot. One day, he had some Austrian-made submachinegun ammo (Hirtenberg, if I remember) I had read as being hotter than should be fired in handguns. He fired 6 and it wouldn't eject them. He pounded the ejector on one of the wooden roof support 4x4's, harder and harder, until the little ejector fingers tore through the bases of the brass cases without the cases moving! He took it home, removed the cylinder and pounded the cases out from the front of each chamber, 1 at a time, with a steel rod. Next time I saw him, he was still shooting the 547, with normal pressure ammo, and the thing was fine. I believe the fingers are a copper-beryllium alloy selected for it's toughness.
I bought mine, a non-pinned 3 incher, in 1983 when they were selling at a discount after sitting for a while. While I haven't shot it a lot, it has worked just fine.