HOWDY, Many CAS shooters are useing 73 winchester reproduction rifles ,with short stroke lever kits fited. 20 inch barrels prefered. must hold 10 rounds in the maginze.
I have always used a variety of Marlins,prefer the 24 inch barrel in 45 colt (,steady aim) 357 are good in short barrels .
First choice would be a 73, then a marlin 1894 cowboy, or a winchester 92 can be very smooth.
Stay clear of the winchester 94 in any cal for CAS. They break often . and are to slow in operation for the nastey abuse and demands in this game .