CAS broke in two directions a while back. SASS seemed to all become about how fast you can run the gun, big targets up close for all guns, pistol, shotgun, and rifle. The last match I shot had pistol targets about the size of a B/C target all at about 7 yards, almost no aiming required, just run the gun in their general direction. Rifle the same but 12-20 yards. I am sure it varies a bit club to club.
NCOWS on the other hand rebelled against this paradigm, set a real minimum power factor, as shot locally if there was a target at 7 yards, you had about a 4" area to get a hit and targets out to 15 or 20 yards would have a 12" area, rifle targets started at 25 yards (10" circle plate) and went out to 100 yards (probably 12x18"), shotgun targets were at the 8-12 yard range but all were the size of a clay pigeon, nothing larger. Most NCOWS shooters locally like myself were also black powder shooters which had become rare and unfashionable in SASS. Severe 10 second penalties for each miss.
I completely lost interest in SASS once I started shooting the NCOWS matches. However nationally NCOWS did not get much steam as there were probably 15% the number of clubs shooting that version that you could find shooting SASS. All of it has suffered demographically the last ten years as the enthusiast, mostly early boomer crowd, aged out of being able to shoot any of it. I know one SASS club match I used to shoot routinely had 60+ competitors and they struggle to get more than a dozen or so these days.