I can't say that swaging the base of a 9mm case down for bullets is a good idea if you are compressing base and web. Otherwise I don't believe that pressing a core into the brass should cause a problem for a chucker.
To be a bit more precise, but not obtusely pedantic:
In the world of bullet making, "swaging" actually refers to increasing the diameter of the core/bullet. When decreasing diameter, it is "drawing".
In other fields, the terms can mean other things - including exactly the opposite. But in bullet making, we 'swage' up and 'draw' down.
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I agree, for the most part, that the RC IV ("RC Supreme") can take simple swaging. ...But I think anything more than turning rimfire hulls into varmint bullets is pushing the limits of the press. The earlier models of Rock Chuckers were designed to handle swaging, but I don't think that's true for the RC IV.
I also use an RC IV for swaging (.40 S&W to 44 caliber, and .45 Auto/.30-06 family cases to 475 caliber projectiles). But I keep in mind, every time that I do such, that some of the operations require a lot of pressure and the press is known for failing when pushed a little too hard.
That being said...
I think I've seen just as many reports of swaging dies popping (splitting) during swaging, as I have RC IVs failing. (Normally the link arms, as I said before.)
I would contact RCBS and at least talk to them about it. Perhaps a new frame could be purchased at cost. It's not likely - they'd probably insist on free replacement - but it wouldn't hurt to ask.