I have been a Concealed Carry Instructor for over 25 years and have always had a handgun available for self-defense if needed. I am not a regular handgun shooter but shoot .40's 10mm and .45 L/C every once in a while, to stay ready. At 78 I have developed arthritis in my hands and my ability to handle recoil and shoot accurately has left me. I have started carrying a Ruger Mark 2 .22 in my truck and left the big bores at home. I feel I can confidently I can control my shots and get several shots off on target at self-defense ranges. The gun does not fire reliably with hollow points but does well with round nose copper jacketed ammo.
Under the circumstances what is the general opinion of the stopping power?