.. the 5.7mm FN handgun cartridge...and has been shown time and again over the past 15 years to be an answer in search of a question that doesn't need to be asked.
I have shot a lot of 1 pound 6 month old roosters with a 40 gr 1200 fps bullet.
Body shots do not even create a limp.
When Reagan was shot with a 22, he did not know he was shot.
This is some really poor stopping power.
What makes the 223 rifle work, is the bullet is so fast the shock wave of liquid flesh getting out of the way, does the damage to other flesh.
Lower velocity 22 bullets just make a tiny hole, that will not stop a 1 pound bird.