100-500 usd or so
Depends on what you are hunting, where you are hunting, your skill level and your pocket book.
Possibly the .460 Weatherby Magnum, the .577 T-Rex, or the .700 Nitro Express.
You will have to contact Weatherby to find out.
Yes, you can shoot a .300 Weatherby cartridge in a .300 Weatherby Magnum rifle, as they are the same caliber. The .300 Weatherby Magnum is designed specifically for that cartridge. However, ensure that the rifle is in good condition and properly maintained for safe shooting. Always follow safety guidelines and consult the rifle's manual if in doubt.
Nice rifle
You will have to contact the Weatherby Collector's Association.
100-500 or so
The 300 Weatherby Magnum is a long action.
3500.00
1000-10000 usd
Custom proposition
It is a Vanguard.