Just to add, i'm probably a bit over 1k rounds now on my LC9. In those 1k, i've had 2 FTL's, and one was my fault, my finger slipped and hit the slide stop, perfect timing, the other was a real FTL, so technically ice had 2, but only one because of the gun.
I'm actually pretty big on ballistics and doing my own testing. I've done it mostly with my .40cal into some water jugs with the first one full of newspaper/water and the rest water, but have only tested 2 different rounds out of the LC9. I've tested Federal 147gr. JHP +P HST's, and those had great expansion with good penetration too. I don't have the numbers but i wrote down and still have the bullets that i fired if i in fact lost the paper with the measurements, but i believe it was somewhere around .65. Also tested Winchester Ranger T-series 124gr. +P's, and those expanded very well too, just under the 147gr. +P federals and the talons deployed very symmetrical, not to mention they;re razor sharp! My favorite SD load is the 124gr. +P Winchester Ranger T-series, good penetration and one mean looking bullet, i sure as hell wouldnt want to get shot by it

. Not to mention they're a very popular and proven SD round, just like the Hornady but i've NEVER tested those out of either 9mm or .40, and i've tested almost all SD rounds in .40.
In .40, i've tested Winchester Ranger Talons and Ranger Bonded, also tested Federal HST's. Tested some Federal HSt's with a bit hotter load in them for border patrol, was lucky enough to buy 1k rounds of those, but they expanded to ~.95 consistently whereas the regular HST's are around ~.85. Also tested Speer Gold Dots, Remington Golden Sabres, Federal Hi-Shoks, and Fiocchi JHP's, all 180gr. and i have them all saved with the measurements too, this was done out of an FNP-40 with a 4in. barrel. I like both the Federal HST's and Winchester Ranger T/B's, but the regular Talons first. They penetrate just as well as bonded in my testing basically (1 1/2in. difference) but they deploy the talons whereas the bonded bullets the lead doesnt peel off exposing the sharp talon. For SD though i'll use either HST's or Rangers, i DO need to test a couple more brands though i just never got around to it, hornady being at the top of the list actually because a lot of people use it, i just have never seen any pictures of them expanded that really impressed me,but again i like to see and do things myself so i'll get around to it eventually.
Must be a good SD round though as it's very popular.