Generally .22 hunting class air rifles good for hunting squirrels. Those that deliver more the 15 ft lbs can be used for hunting rabbits but you should go for head shots.
Some air large bore air guns can deliver considerable force good for coyote or even Wild Bore (the Quackenbush Outlaw). The upcoming Crosman Rouge looks like it will be a good varment hunting rifle out to over 100 yard for coyote or smaller creatures.
Note Lewis and Clark had an air gun they used to keep meat on their table.
Depends on the rifle. Accurately? About 50 yards max.
Needs the services of a trained repair technician
No
No. .22 Magnum and .22 Long Rifle are not interchangeable.
No
Practice
NO NO NO! Only shoot what the rifle is chambered for and so marked.
Yes
22 Rifle is so easy to handle and does not cost a fortune to shoot, it has remained a favorite.
Either a shotgun or a .22 caliber rifle.
@ 1.5 miles
No, the 22 Mag will not fit.