I don't know ballistics all that well, so I figured someone here can give me a heads up. I keep 180gr JHP in my G23 for home defense (and, someday? for carry). Are the 180gr FMJ close enough that it's not going to mess me up if I use them for practice? I've mostly had 165gr FMJ in it to this point (because it's about all I could get ahold of), but I'd prefer to practice with the same thing I'd use. JHP seems a little pricey for punching holes in cardboard. If I use the FMJ for range-time, is it going to be a noticeable difference from the same weight in JHP? Thanks, folks.