What does a 22 Hi-power bullet look like?
If you google "22 hi power" you will get at least on picture
The top of the CARTRIDGE is the bullet- and they are not threaded, so they don't unscrew. The cartridge case is crimped onto the lead bullet. Playing with ammo- especially rimfire ammo like the .22, is dangerous. If the rim (which contains the primer) is crushed, the cartridge can explode. Strong likelihood that is going to hurt you.
Depends on the .22 cartridge, what weight bullet, and what it is fired in. Some .22s travel slower than the speed of sound (about 1100 fps) some high velocity 22 LR cartridges fired from a rifle reach muzzle velocity of 1750 fps with a 30 grain bullet. The .22 Magnum may reach 2200 fps with the 30 grain bullet.