Well, the legal FPS for an airsoft gun is 450, but you can get snipers, AEG's, etc. that run up to 600 FPS and beyond.
As a very general rule, bullets are propelled by burning powder, pellets by air or C02
Yes. If it's an airsoft it will sting. If its a BB gun or pellet gun it can penetrate the skin and do damage to a person.
Use C02 to propell the pellet
It all depends on the gun and what powers it. Pump. Green gas, C02, Spring. Some fire at 150 FPS some fire at 450 FPS. (Feet per second)
Yes. In fact it's not recommended to leave a charged C02 pellet in a BB gun. It will eventually rupture the seals. After shooting release the C02 gas. If you have a pistol that requires a pellet to be in the handle so the grip can stay attached, then leave a discharged C02 pellet in the handle to keep the grip in place.
Not all pellet guns use C02 some are designed to use a spring or pump. Pellet guns that use C02 are rapid fire guns and do not require re-cocking or pumping between each shot. BUT they usually have less power that spring or pump pellet guns.
Why would you want to? That sounds lame.
A pellet rifle has no firing pin. It also can not fire a bullet or gunpowder. It can not be made to do so either. The pellet has no charge (casing like a bullet) it just a pellet. However pellet rifles can be just as deadly as a real firearm. They use Air or C02 to project the pellet downrange. Some Pellet rifles are used for hunting, others for target practice. The Major difference between a firearm and an air rifle, is Gunpowder is use in Firearms and Air or C02 is used in Air rifles.
Not normally. In fact I can not think of any pellet rifle that takes a 16 gram C02 cartridge.
Yes. Pellet guns are: Pump action, C02 driven, Spring action. The more powerful ones are called PCP. (Precharged pneumatic. ) They use a Tire pump or scuba tank to charge them. All Air Guns & Air Rifles are driven by Air or C02.
They are about the same, depending on the pistol. C02 has a tendency to be a little louder on certain pistols but not much difference.
ZERO! you don't use propane you use C02.