.22 Long Rifle. If that's not practical for what you're hunting, then you'd need to let us know what it is you intend to hunt in order for something more practical to be recommended.
it depends on what your hunting
A "sniper rifle" is simply a rifle employed for that purpose. So long as the "sniper rifle" meets the criteria and restrictions for hunting firearms in the state you're hunting in, you can use it.
Hunting rifle scopes come in a wide variety and are easy to find online. Some websites like The Scope Smith and Optics Best Buy offer hunting rifle scopes.
The NORINCO CQ5.56.
18
yes
One of the main advantages of air rifle hunting is that it's easy to use, gives you cheap practice and is also good for hunting small game. One of the main disadvantages or air rifle hunting is the fluctuation of pressure in relation to ambient air temperature.
It all depends on what you are hunting.
Game of all size and shape is hunted, and the calibre varies in accordance with what it is you're hunting. If you're hunting elk, you're not going to use the same calibre you would hunt squirrel with, and vice versa. A hunting rifle is simply a rifle which is used for hunting - that in itself doesn't determine what's being hunted, and it would be impossible to determine an average calibre, given that not every hunting rifle was a purpose built rifle - some hunters, for example, used decommissioned military rifles such as the SKS.
If a rifle is permitted for hunting, semi autos can be used in MOST states. Pennsylvania does not permit them for big game hunting. You would need to check the hunting regulations for YOUR state.
It depends on the hunting regulations where you live.