No.
That depends on what you intend to hunt.
18 in the US
Sorry- no one answer- you did not say what you are hunting. You can get a decent used .22 rifle for about $100. Rifles for larger game may start at about $200, and go up from there. Depends on what you want to buy- like cars.
Try e-gunparts.com and MidWest Gun Works.
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.
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You will have to buy as many different brands and bullet weights as you can afford and shoot them to find out.
You can buy it from the Gun Runners, and if they don't have it; just wait for 24 hours and check if they have it, if not again, keep repeating.
It depends on the hunting regulations where you live.
Depends on Texas law.
Long range hunting, the lower end of big game hunting.