In .22 cal it's rated at 1000 FPS
100-400 or so
10-200 usd
No.
100-1000 USD or more depending on specifics
10-200 usd
Which .50 cal, and do you mean .357 Magnum? If you're comparing the .50 AE to the .357 Magnum, the .50 AE is more powerful, by far.
You can get a manual for free at Ruger's website.
Yes
Yes, the .500 S&W Magnum is a significantly more powerful cartridge than the .50 Action Express used in .50 cal. models of the Desert Eagle.
100-300 or so
You need to contact Ruger. You may have a prototype
Depending on EXACTLY what you have and the conditon, it can range from 75-500 USD. ruger .22 cal single six