Thanks, I don't want to screw something up.I believe it comes with an 18lb RSA.
You can go to Wolff Gunsprings and get a stainless guide rod and "calibration pak" that comes with an assortment of spring weights. That way, if you want to shoot softer target style ammo, you can put in a softer spring and still get reliable cycling. For the premium SD style loads, maybe go back to something closer 18lbs.
The ports on the G23C will result in reduced velocity (as compared to a non-ported G23), so going stiffer in springs likely will result in FTF's at some point.
Good luck, welcome to GT.
You won't, it is very straight forward. You can start with 18lb and likely will be very close. If you get some FTE's, go down to like 15.Thanks, I don't want to screw something up.