Mmm. I would expect a Walther should be able to run reliably with some kind of HP ammo, but might require some testing or feed ramp polishing.
Probably best to stick with 9mm as a minimum if at all possible. I remember Gov. Perry was able to successfully cap a coyote with his LCP but he probably had some bodyguards for backup.
I have seen pistols which were beautifully finished yet they left the feed ramp rough. I almost wondered if they did it on purpose but don’t think they did.
I used to have a cratex point for my dremel tools which was perfect for polishing feed ramps. I finally used it up and haven’t found another one except as part of a complete set of bits. It would really polish them without removing any metal to speak of.
Yep ...been a 45/357/40 sort for many years .....threats come in double digit numbers these days and modern designs for projectiles make the 9 a viable prescription for self defense.
Stay safe ...