I've used shot loads (Speer shot cups) in 38 Special, 357 Magnum, and 44 Special. Some time at the pattern board will tell you that they are a close range proposition- 10 feet or so being the ideal distance. Also, faster is NOT better. Hot loads do indeed blow a hole in the center of the pattern.
I have also made shot loads for 45ACP similar to what the pictures show. Didn't have the RCBS die set (it ain't cheap) so I cobbled together a way to do the same thing from several dies I already had. Getting 45 ACP shot loads to cycle is a sometimes thing- the reason being that the shot charge is around 145-150 grains (quite similar to the charge a 38/357 Speer shot cup holds). A problem you'll run into with the 45ACP is that increasing your powder charge to improve cycling will make your shot pattern go to hell.
IMO, using shot loads in a 45ACP is best looked at as a single load proposition- still useful, but you have to rack the slide.
Elvis, this is sort of a historical trivia, but in Thee Olden Days, there was a 44-40 shot load available from some ammo makers. Annie Oakley and others of the day did some of their shows indoors, shooting at thrown objects, etc, and never blew holes in the roof.