Impossible to answer without knowing who made it, condition, finish, etc..
The value of a Harrington and Richardson 7mm Remington mag serial number 52897 depends on its condition. This gun in excellent condition is valued between 125.00 and 200.00 as of 2014.
Browning does not make a M70 semi auto 7mm nag
Browning did not make the Model 70, Winchester did. Also, the serial number is not a valid Browning serial number for a 7mm Magnum rifle. Please doublecheck your information.
Made in 2000. 300-500 USD or so
100-1000 + USD depending on specifics.
You will have to call Browning with the serial number.
Your browning safari bolt action rifle was made in 1970.
100-1000 usd
100-10000 USD depending on specifics
Browngin has good sn data on their website under customer service.
I would need to know the model of your Browning firearm,and the overall condition of it to establish a value that you seek.
Look on the receiver and barrel.