The FBI penetration & expansion data is a damn good basis to go off of, but on occasion,,, and very slim occasion there are a couple of loads that seem to give the folks that look at the data heartburn and this and it's competitors load the RA115HP+ Winchester load will do that. I have, in the pistol on my hip, 147gr +P HST's and I have the 124gr +P HST's in 2 more 9mm's but in my kitchen is a 9mm with 9BPLE in it. I don't believe in "Hydro Static Shock" in Duty pistols, I don't believe in "Energy Dump" in Duty Pistols, nor do I believe in Magic, so we can get that outta the way. I do believe what the LOE's,,, that have dumped a truck load of "Bad Dude's" with this and the Winchester Load say about it, and that is it work's, and works well. There only about 3 115gr 9mm I would trust my life with and these are 2 of em , the Speer 115gr Gold Dot +P+ load is the 3rd. I haven't had the chance to really test the Underwood 115gr +P+ load with the Nosler bullets yet so I cant say yay or nay about those other than in my pistols there accurate and reliable. Bullets are very low on my list of things I worry over. I like talking about them, I like testing them myself and my friends and myself have done quite a bit of that also. I worry about reliability, accuracy, penetration, and expansion in that order. There are better loads than the 9bple nowadays, but people haven't evolved over the past 20 to 25 years since this WAS THE 9MM load that got it done whenever no one wanted a 9mm as a Duty or Self Defense pistol. I like them cause I can still get a case of 1,000 for $319 to $359 the Glocks of mine LOVE them and I can take a decent cartridge to training classes. Yes I am weird, I am also not to hardheaded to see if I am making mistakes tho, so if anyone can lead me to where the 9bple totally failed on a % more than what is "Normal" in a self defense or LEO shooting's I would unload my "Kitchen" Glock and shoot up about 12,000 rounds of Stash ammo. Edited : When I said bullets were low on my list of things I worry about, it is not that I don't or haven't put any thought into what I will carry, it is I put these first. Training, dry fire practice, reps. from concealment, and I am gonna throw this out hear,,, JUST PLAIN DAMN FUN SHOOTING! are on my list with or above the bullet's, if it goes 12 inches or more I am good with giving it a try. I figure I have to be able to put the bullets where they need to be accurate & fast before they, the bullet itself can do it's thing and if I send one there gonna be some friends flowing it close behind.