I don't CAS, but the owner's son of the shop I work in is 22 yr old and 8 time overall world champion. His dad is a past world champion and a CAS governor for a multistate area. So I hear all the CAS news and know all the guns that are used by the top tier of shooters...and all the guns that are NOT used.
Used: Rifles: Uberti 66/73's and pre-Remington Marlin 94's.
Handguns: Uberti SAA's (they also made all the parts for all third generation Colts), Ruger New Vaqueros (coil spring gives it a slight advantage over the Uberti.
In Wild Bunch: 1911 by STI, Mod 12 Win, Uberti 66/73/ pre-Remington Marlin 94's
Shotguns: depends on class but Browning single trigger double, SKB sts, Win 97, Win Mod 12
Unfortunate that Remington QA/QC has gone to hell.