Which caliber?
500 USD or so
No, the 300 ultra mag cartidge is not interchangeable with the 300 win mag.
Only what it is chambered for.
A few hundred to multiple thousands depending on specifics
Ruger's website has sn data.
a 150 grain bullet shoots 3290 fps
In the condition you have described your Ruger No.1 will range in price from 675-900 dollars.
22 Long
Depends on how big the difference is and the range.
300 win.
You will have to shoot to find out.