Protection from what ?
9mm rounds are for people and the 147 was designed for a subsonic accurate SMG round .
Protection ? get a 357, 41mag. 44mag ,45 Colt .For autos a 10mm or 45acp .
For the big things that go bump in the night ,the larger rounds can be equipped with Hunting bullets [Corbon DPX,Swift A-frame, Speer Deep Curl], rather than people bullets.
And Watson , bring your revolver !