The CH 1 piece die is a "1/2 jacket die". 1/2 jackets work OK. CH does sell a 2 die set to swage 3/4 jackets, but even those won't do the work of the more expensive/much stronger Corbin dies. However, they are excellent for their stated purpose. They are not obsolete at all. Many use them today, especially to swage low velocity lead wad cutters. If I remember the actual die screws into the die holder (body). I'm not familiar with any CH model that uses a set screw that holds the die in the die holder... it may be an older model. Most 'O' frame reloading presses, especially the Rock Chucker are OK for these dies. But remember, swaging even pure lead in .44 and .45 caliber sizes will put more stress on these presses than they were designed for. While it's true that RCBS got it's footing in the business swaging .224 bullets, more than 3 times that pressure is needed for .45 calibers. Again, you can swage on a solidly built 'O' press, but expect some wear to occurr over time in the linkage and on the ram face.
While it is possible to roll a .429 lead ball until it fits into your swage die, it's not worth the effort. Why spend a minute making something that will only save you 2 cents? Swaging is suppose to be cost effective ( amoung other things).Finally, if you want to sell the one you don't have a need for, try advertising it on this board. ( As swaging is such a specialized field, I believe Graybeard wouldn't mine you doing that rather than posting it on the "Classifieds" board.