I have two g20s. If I do carry one I have a 10 round magazine for carry. If I can't get out of trouble with 10 + 1 I don't think 16 + 1 would help. I think 10 round magazine would be easier to explain in court. I am not sure how easy the 10mm would be to explain. I could be thought of as an aggressor caliber, someone looking for a fight.
I personally stick to the 38 special 120gr +p. it makes sense to a defense attorney and a prosecuting attorney. If you are going to carry you should thank about both sides of defense.
Texas, I luv u