I like the Aguile SSS. It's a 22 short case with a 60g bullet at 950 fps. It also has 120 ft/lbs of energy. That's the most powerful subsonic I know of. They hit like a sledge hammer.
The number one cause of death in the 20th century. 290,000,000 citizens were first disarmed and then murdered by their own governments. This number does not include those killed in war.
We're from the government, we're here to help