Made in 2002. Value range 300-700 USD.
http://www.browning.com/faq/detail.asp?ID=109
Browning did not invent the 7mm
The only way to know is to shoot and adjust
You will have to call Browning with the serial number.
You will have to shoot the load at different settings to find out which one works best with your particular rifle and ammo.
Browning does not make a M70 semi auto 7mm nag
1966.
You have to experiment with different settings and ammunition.
It is impossible to stop recoil.
Best left to a gunsmith.
I believe it was from 1962 onward.