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You should also consider that using 115gr may not be powerful enough for the slide to do its job. You should be okay. It is something that can cause problems with pistols that have short, tight recoil springs.
If you have a stock gun that won't function reliably with factory 115 grn. ammo, the gun has a problem.
What Lee said. Use whichever Full Metal Jacket practice ammo is cheapest that still reliably works in your gun. Assuming this is a defense weapon, and you said you are a newbie, you aren't trying for pin-point accuracy. You're working on achieving "minute of bad guy" groups and learning muscle memory for different activities like racking the slide, recovering from the shot recoil, and reloading.
For the bullets you actually use for defense, however, don't go cheap. Go with something like Speer Gold Dot, Federal HST, Winchester Ranger, Remington Golden Saber, or anything hollow point by Cor-Bon or Buffalo Bore. If your gun is rated for it you might even go for +P (over-pressure) ammunition.
JFYI, +P isn't over pressure, just loaded to closer to maximum. It is called over pressure as sort of a marketing thing and many sources use the term, it isn't accurate though. While +p is over standard pressure it isn't over pressure for the cartridge.
+P+ is truly over pressure even for the cartridge specification but isn't an official designation, some ammo makers use the term.
There is standard pressure and then the high pressure or +P, typically a firearm should be marked to be used safely for continued use with +P ammunition.
+P+ is what you'd find like the 95 gr. flat point open jacketed 9mm bullet, (FBI used them, don't know if they still issue the specific loading anymore)
JFYI, +P isn't over pressure, just loaded to closer to maximum. It is called over pressure as sort of a marketing thing and many sources use the term, it isn't accurate though. While +p is over standard pressure it isn't over pressure for the cartridge.
+P+ is truly over pressure even for the cartridge specification but isn't an official designation, some ammo makers use the term.
There is standard pressure and then the high pressure or +P, typically a firearm should be marked to be used safely for continued use with +P ammunition.
+P+ is what you'd find like the 95 gr. flat point open jacketed 9mm bullet, (FBI used them, don't know if they still issue the specific loading anymore)
Maybe semantics. As I understand it, standard pressure rounds are loaded to SAAMI "Maximum Average Pressure", which is considerably less than the "Maximum Test Pressure" or "proof" pressure.
For 9mm, according to SAAMI:
MAP: 35,000psi
+P: 38,500psi (generally about 110% of MAP)
+P+: anything over 38,500psi, not an official designation
Proof Load: 45,500psi (130% of MAP, guns are tested to this)
As for the semantics part, I consider "over pressure" to be anything over Maximum Average Pressure.
Taking a different line, I recall reading in the past that commercial "standard pressure" rounds are actually loaded to lower than standard pressures for liability reasons. This would mean that +P rounds are actually closer to MAP. But I can't find a reference right now, so maybe my memory is playing tricks on me.
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