It's primarily a feeding thing. A .45 will feed 'em, but a 9mm won't normally feed 'em well.
"...SWC's are traditionally slow fire bullseye loads..." Depends on the cartridge. WC's are target bullets in most cartridges. SWC's are used in .45's because a WC won't feed. Most current .45 pistols are set up to feed 'em, but that wasn't always true. Doing it is just extending the sides of the feed ramp up the rear edges of the chamber.
The few .38 Special pistols like the Smith 52 and Gold Cups that use WC's exclusively are specially made for 'em. Those pistols won't feed anything but WC's.
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