Posted On: 7/23/2020 By: Kenneth Meredith A: SIG's P320 handguns are indeed able to fire 9mm +P ammo. You don't need to have on your handgun out by training with overpressure ammo, Normally, but for self-defense it will eventually do pretty properly.I cannot say just how likewise this ammo will accomplish to Gold Dot in your G17, however it is with