Depends on what you are hunting. See the link below to the Illinois Game Regulations.
Over 3000 yds
caliber limitations are set by the hunting ministry in your region, eg 243 for deer(smallest) 22lr for smll game eg rabbits and so on
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.
Depends on the laws where you live.
rifles are used for war and legal hunting. I want to use it for shooting "cans".
Yes- see link at bottom of page.
If you can legally own a suppressor, you can just as legally mount it on a hunting/sporting rifle - however, you can't do this when you're actually hunting with those firearms.
.22-250 Remington is a caliber and not a type of rifle. Several manufacturers have made rifles in this caliber. Without knowing the exact make, model, and condition of the rifle this question cannot be answered.
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.
No you need pretty serious permits just for a hunting rifle. No automatic fire arm is legal in Canada
18 for a shotgun/hunting rifle, and 21 for a handgun.