1970
You will have to call Browning
Call Browning or check the serial number on their website if it is up.
Comparison to known serial numbers.
The suffix of M71 was assigned to the Browning model BAR(Browning semi-auto rifle) which was made in the year 1971 in Belgium for Browning.
Most likely, yes.
By including the serial number in your question.
Impossible to value with only a serial number.
1975
100-1000 usd
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.
If you are asking about a Browning BAR rifle,then it was made in the year 1968.
Your browning safari bolt action rifle was made in 1970.