Congrats on the G32 it is one of my favorite Glocks. I really like the 357sig cartridge. Very accurate, flat shooting, and hard hitting. Since you are new to Glocks I thought you should know you can also switch out calibers on your G32. With a G23 barrel you can fire 40 S&W or you can get a 9mm conversion barrel and shoot 9mm out of it.
Like I said the 9mm is a conversion barrel so don't just buy a G19 barrel thinking it will work because it won't. But a standard 40 barrel for a G23 will.