Hello, Anthony. You've been given some pretty darned good advice on ammunition usage. As I mentioned in my PM to you the other day when I couldn't get my response to post right, I've had extremely good luck with:
Federal 115 gr JHP std pressure
Federal 124 gr Nyclad HP std pressure
Hornady "Custom" 115 gr XTP
Hornady "Custom" 124 gr XTP
Triton 125 gr Hi Vel +P JHP
Let's toss Remington's 115 gr +P JHP in the mix as well after reviewing some targets fired with various BHPs.
Now I'll give what I have seen with each of these in animals I've shot with each as well as in informal expansion testing. For some pretty detailed poop on bullet performance, you might want to drop by
www.ammolab.com and click on "Test Results," pick 9mm and you'll see how many of the rounds for 9mm did in various gelatin tests.
Federal 115 gr JHP: As has been mentioned, this one's
usually pretty darned accurate, but
can turn in mediocre accuracy depending upon whether or not the particular pistol "likes" it or not. It will still be grouping smaller than "minute of human heart" in any quality pistol and certainly in a Browning HP. It's not particularly "hot," but the older bullet design does seem to work well in the 1100 ft/sec range it generally flies at . It's proven an expander in jackrabbits, raccoons and fox for me and while not "scientific" in how that translates to human aggressors, it did work better than some rounds in both this and other calibers.
Federal 124 gr Nyclad HP: This one's proven exceptionally accurate in some pistols and just "good" in others. The lead hollow point is nothing fancy, but generally expands in tissue or at least deforms due to its soft nylon jacket. The problem is that it's not for sale to the general public anymore. Both it and the load above are not hard-kickers for a non-shooter, either. I've killed a few fox and saw a coyote shot with this load from a Browning. It worked well.
Hornady Custom 115 & 124 gr XTP: Both of these loads have proven extremely accurate in the Browning with the standard bbl. I'd give the 124 gr the edge in terms of accuracy, but remember that I'm speaking of slow-fire groups, not the fast and furious shooting likely in a defensive shooting. Both are accurate. The XTP bullet is always a first choice when searching for an accurate load having some velocity. At the 1100 to 1150 ft/sec, the bullet goes to about 1.5 calibers in diameter and is NOT as aggressive an expander as many other 9mm JHPs. I've had better luck with it than its "controlled expansion" characteristics would lead one to expect. Loaded to higher velocity (1250 to 1300 ft/sec) in an older Corbon +P load or handloads, it's proven most effective. I've taken javelina, a deer, and various other critters using it.
This 124 gr XTP was loaded to about 1250 ft/sec and was recovered from a javelina shot at about 30 yards from a 9mm Browning MkIII Hi Power.
If I remember correctly, penetration was approx. 14" or so. I didn't take a lot of time measuring due to jumping fleas!
Triton's 125 gr +P JHP: Hits velocities well over 1200 ft/sec from the Browning HP, usually around 1250 ft/sec or a bit better. It's bullet looks like the XTP, but expands more aggressively and does not penetrate quite as much as the XTP. If overpenetration concerns are there, I think they're pretty minimal with the Triton or either of the Federal loads. I do think that the XTPs would penetrate a human torso front to back in most instances. How much "oompfh" it has left, I'm not sure. Triton's 125 and 115 gr Hi Vel +P JHPs have proven extremely effective on quite a few javelina. My defensive HP would be loaded with 125 gr +P Triton JHPs and my wife's gun has them in it right now.
Remington 115 gr JHP +P: This one frequently produces very nice accuracy and gets over 1200 ft/sec in every HP or CZ75 I've tried it in. Expansion's been satisfactory in fox, jackrabbits, and informal testing. I would not be afraid to use this load for my own protection, either. I understand that Remington offers this same bullet style in 125 grs now and in a +P loading, but I've not seen nor shot any of it so I cannot intelligently comment on it.
Chronograph Results: I don't know how much use this will be, but it should give you some pretty close data to what your HP will do with various loads.
Unless otherwise noted, the 9mm loads were fired from a Browning HP w/ factory bbl.
The CZ-75 also had std. factory bbl.
9mm Cor*Bon 115 gr. JHP: Ave. Vel. = 1381 ft/sec
9mm Cor*Bon 124 gr. XTP: Ave. Vel. = 1258 ft/sec CZ-75: (125 gr. Sierra Bullet): 1220 ft/sec
(ES: 21 ft/sec!) (ES: 36 ft/sec!)
IMI Samson 115 gr DiCut JHP: Ave. Vel. = 1251 ft/sec (ES:36.25 and SD: 11.95)
9mm Triton 115 gr. HiVel: Ave. Vel. = 1332 ft/sec CZ-75: 1337 ft/sec (ES: 10 ft/sec!)
9mm Triton 125 gr. HiVel: Ave. Vel. = 1281 ft/sec (ES: 27.54 and SD: 11.70)
9mm Triton 135 gr. Quick Shok Ave. Vel. = 1182 ft/sec
(ES: 27 ft/sec!)
9mm Hirtenberg 100 gr JSP: Ave. Vel. = 1299 ft/sec
9mm WW USA 115 gr. FMC: Ave. Vel. = 1161 ft/sec
9mm Glaser Blue 70 gr. Pre-Frag Ave. Vel. = 1534 ft/sec
9mm Handload w/115 gr. Sierra
JHP/6.2 gr. Unique Ave. Vel. = 1242 ft/sec
9mm Handload w/124 gr. Hornady
XTP/6.0 gr. Unique Ave. Vel. = 1243 ft/sec CZ-75: 1238 ft/sec
Same w/moly XTP Ave. Vel. = 1285 ft/sec
9mm Handload w/124 gr. Rainier
PRN/6.9 gr. Blue Dot Ave. Vel. = 1166 ft/sec CZ-75: 1168 ft/sec
9mm Federal 124 gr Nyclad HP Ave. Vel. = 1079 ft/sec CZ-75: 1109 ft/sec
9mm Speer 124 gr GoldDot +P Ave. Vel. = 1199 ft/sec CZ-75: 1243 ft/sec
9mm Remington 88 gr. JHP Ave. Vel. = 1526 ft/sec CZ-75: 1504 ft/sec
9mm Remington 124 gr. Golden
Saber +P Ave. Vel. = 1157 ft/sec CZ-75: 1169 ft/sec
9mm Federal 115 gr. JHP (9BP) Ave. Vel. = 1130 ft/sec
(ES: 25 ft/sec!)
9mm Hornady 115 gr. XTP Ave. Vel. = 1161 ft/sec CZ-75: 1167 ft/sec (ES: 7 ft/sec!)
(ES: 23 ft/sec)
9mm Remington 115 gr. JHP +P Ave. Vel. = 1251 ft/sec CZ-75: 1265 ft/sec
(ES: 24 ft/sec)
9mm Federal M882 Ball Ave. Vel. = 1146 ft/sec
9mm Speer 124 gr TMJ Ave. Vel. = 1141 ft/sec
9mm Magtech 115 gr . Ball Ave. Vel. = 1167 ft/sec
9mm PMP 115 gr FMJ Ave. Vel. = 1125 ft/sec Glock 19: 1110 ft/sec
CZ-75: 1124 ft/sec
Handload: Speer 124 gr GDHP/6.0 gr Unique/WSP/Mixed cases
LOA: 1.12†Ave. Vel. = 1234 ft/sec ES ~ 12 ft/sec
Handload: IMI 115 gr Die Cut JHP/Same as above. Ave Vel = 1277 ft/sec
Below, you can see the different POI vs POA for the lighter or faster bullets @ 15 yards from a fixed sight MkIII.
Here's a few more fired at the same distance.
While I do recommend the use of a Wolff conventional 18.5lb recoil spring rather than the factory 17lb standard, IF your wife has a problem of not holding the gun firmly enough, the heavier spring
can lead to possible malfunctions, particularly with the standard pressure loads. A spring is minimal in cost, so I suggest that you might buy an 18.5lb standard recoil spring from Wolff (
www.gunsprings.com) and then have your wife shoot the pistol with whichever load you choose using both springs. If you use the standard pressure loads from here on out, the factory is just fine, anyway.
Best and good luck.