It may be, but there'll be restrictions on things such as magazine capacity, types of ammunition you'd be allowed to use, etc., much the same as with any other hunting rifle. What you'd be hunting with one... maybe a safari hunt in Africa, in which case, you'd probably run into laws prohibiting possession or ownership of weapons chambered in military calibres.
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.
You will have to define "sniper rifle". There is no meaning to that term, other than an accurate scope mounted rifle. That includes most hunting rifles.
It depends on the gun and caliber but most semi-automatic rifles such as the Ruger .22 are legal to hunt with in California.
Depends on what you are hunting. See the link below to the Illinois Game Regulations.
It's all in the caliber and fps.
In the US, the two most popular deer rifles are the Winchester 94 and the Marlin 336, both in caliber 30-30. However, "best" is a matter of choice, and the area where you hunt. A bolt action rifle in a caliber legal for your state may be a good choice, and less expensive than the lever guns. I hunt with a muzzle loading rifle, and get to hunt 2 more weeks than the folks with modern rifles.
I see no reason why not.The 30-06 caliber rifle surely meets minimum caliber requirements.
In the state of Missouri Its perfectly legal to hunt with a black powder rifle during deer season. In all counties
1-in-66" barrel twist is a Kentucky rifle, not a Hawken. The Hawken brothers used a lot faster twist than that; you needed it for the prairies. Googling "Kentucky Rifle kits" will give you several makers of these rifles in kit form. As to legality for hunting? Any muzzle loading rifle that's at least 50 caliber is legal to hunt with in Idaho.
usually a .50 cal sniper rifle, but also has the ability to fly in and stab it with a katana.
Yes. There may be limits on the CALIBER, and PA does not permit semi-auto rifles for deer hunting, but other than that, the AR style rifle is nothing but a semiauto rifle.
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.