Hello!
And welcome to the forum from the Wild Wild Upper Midwest.
I have used lightweight frangible ammo in a few of my pistols, works great. But I don't use it in my PCC. I agree with the "try different ammo" crowd. Just make sure it shoots the self-defense ammo that you want to use. For example, I like the Gold Dot 124 grain. All my 9mm units shoot it well. Then I practice/train with the same weight ball ammo, for consistency.
Thanks for joining us. I'be been eyeballing a 9mm Saint Victor to keep my AR-Saint Victor company. Which one do you have (barrel length)? Right now I have only the S&W M&P FPC, unless you count my Henry, but that's .357. Anyway, good to have you here.
Thank you for your indulgence,
BassCliff