"Best" is a very relative term. We'd need to know what YOUR criteria of "best" is, as well as the application you're using it for, before we could even begin trying to answer this. For some, a 10/22 might be best... for others, not so much.
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.
Millions have been made.
Yes, but there ARE restrictions on WHICH rifles, as well as which features are permissible.
Some are, some are not. California has very stringent limitations of firearms.
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.
Contact Savage. They are still in business, making good rifles.
Yes, semiautomatic rifles are legal for hunting in Maryland, but there are specific regulations regarding their use. Hunters must ensure that the rifle meets certain caliber requirements and that it is compliant with state laws. Additionally, some hunting seasons and game types may have restrictions on the types of firearms that can be used. Always check the latest Maryland Department of Natural Resources regulations for the most current information.
Best to let a gunsmith show you how to disassemble the weapon.
Gunshop
You get what you pay for.
No
Semiautomatic means that you don't need to operate the clutch but you do need to select the gear range manually.