Yes, but there ARE restrictions on WHICH rifles, as well as which features are permissible.
Barrett makes a range of .50 rifles, some of which are self loading (semiautomatic), and some of which are bolt action. The most famous of these rifles is the M92/M107, which is semiautomatic.
No. Semiautomatic .22 rimfire rifles may be used for small game, but no semi rifles for deer. See link to Vermont hunting regs, and scroll down.
Millions have been made.
You will have to contact the CA Dept of Justice or visit their website to find out what the current laws are.
It depends on the gun and caliber but most semi-automatic rifles such as the Ruger .22 are legal to hunt with in California.
Yes.
So long as the firearms they're transporting are legal at their destination, yes.
MOST rifles are- but you need to refine your question to get a meaningful answer- legal for WHAT?
Yes. .50 BMG rifles are legal in Ohio. The only state which has banned their further sale, transfer, or importation so far is California.
Contact Savage. They are still in business, making good rifles.
Yes- with approval of guardian, under the direction of an adult.