You can download a manual for free at browning.com
Best to get a manual from Browning or let a gunsmith do it.
You have a browning a-bolt rifle chambered in .270 winchester caliber.
200-500 USD
You must call Browning with the serial number.
You need to know the make, grade and model. 270 mag rifle could be anything
100-500 or so
50-600 usd
Yes you can. A .270 wcf and .270 win are exactly the same thing.
Browning.com has a sn function under customer service.
@ 400 USD
100-1000 USD depending on specifics
270 Winchester is the name of the cartridge your rifle uses. It was first introduced in 1925 for the Winchester Model 54 bolt-action rifle, but other rifles made by Winchester, Remington, Browning, and other manufacturers have been chambered for the same cartridge. So, about all I can say for sure is that your gun is less than 80 years old.
Fabrique Nationale or FN is the maker.