My concern is with the BB 100-gr ".380+P" round damaging a gun that was engineered to shoot conventional .380 ammo (and is pushing the envelope even for that ammo). I'm not worried so much about a catastrophic failure that would injure the user as with a mechanical failure at an inopportune time.
I'm not going to advise you what to put in your gun: I don't know your circumstances and it's not my decision to make. You should load whatever makes you comfortable for your needs after you research the subject and see what works in your gun. (Alternating rounds in the mag has always struck me as silly, but it's your life.
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