I want to take a stab at the ratings.
50:5 CT with native 25A current, but two wraps through the core (because I have the headroom and the numbers work nicely) will give an apparent 50A.
Sensing 50A, produces 5A peak (7.07Arms) in the secondary.
The burden resistor is across the both leads, so Aref/2 in
https://openenergymonitor.org/emon/buildingblocks/ct-sensors-interface doesn't apply.
I will want to see 5V at 7.07Arms, so R=V/I = 5/7.07= 0.707 ohms. 0.707 ohms is not common, so 0.5 ohms.
As for the power rating of the burden resistor, P=IV=7.07X5=35.35 Watts
Assuming the voltage drop of the diode in the bridge rectifier is 0.7V, P=IV=7.07*0.7=4.94W.
So the burden resistor is 35W(min) 0.5 ohm and the bridge rectifier needs to be rated for 5W(min).
Am I close?