Welcome from Tennessee.
Hello, Wrongwheel, and welcome from Missouri to a great forum. Good people and info here! I also have the SP2022 9mm, and love it. Extremely reliable, eats anything fed it, and great value for the money.
Since you are fairly new to this handgun, self defense arena, consider taking some good self defense classes. I also recommend you check out the many free YouTube videos made by Massad Ayoob, a world-class instructor in handgun use and self defense, who has recorded training sessions in Judicious Use of Force, Shoot to Live, Home Invasion, Preparation for Home Defense, and What to Do After a Shooting. Just Google his name and these topics and the YouTubes should show up. Very good instructional information from an expert, and free.
Here is a very good technical review of self defense ammo, when you want to consider this:
Best Choices for Self Defense Ammo
This is an informative review by a doctor of different gunshot wounds effects; we all need to be aware of this real-life information:
Doctor Talks About Gunshot Wounds
Take care, and best wishes to you and yours!