I’ve loaded well over 10k rounds on my rockchucker. That means 30k pulls of the handle and I’m sure she’s got lots of life left in her. If you’re just starting out, I can see a good argument for single stage. Even if you plan to go progressive for high volume eventually, you learn more about each step on a single stage IMO. If your magnum loads will use powders that don’t meter well like 800x a single stage makes a lot of sense too. Hard to beat a rockchucker.