It depends on the power of the air rifle, Local laws and the location where you live.
Depends entirely on where your back yard IS- and the local laws.
No. An airsoft rifle is not a legal weapon to use when hunting deer in South Dakota. It is also illegal to hunt on private land without permission plus it is illegal to shoot a firearm within 150 yards of a residence, building, campsite, or recreation area.
Yes
No.
It all depends on the rifle, pellet and power source.
Depends on the rifle. Accurately? About 50 yards max.
yes
Depends on where the backyard is located.
yes, if you are in space at the time and have an air rifle, you shoot it out the window, you die because of the vacuum, but it is successful. you killed yourself but got a BB pellet into space. WEAR a helmet next time.
When you say Air Rifle you are referring to a pellet rifle not a firearm. At present there are no 300 Cal air rifle being made.
Not anywhere in the US that I am aware of. Do understand that an air rifle, from a certain distance, looks like any other rifle so don't point it at cops or they will shoot you.
yes it is