As with any firearm, it is not possible to accurately appraise a gun without seeing it. Recommend that you see a local gun dealer for an appraisal.
You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List"
You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers.
Around 1500
50- 300 usd
300-500 USD
60-600 usd
Value depends on condition and which version you have. Use the link below to find the value
50-800 usd
@ 300 USD.
The value of your Browning BAR Mark II safari will be between 325-625 dollars,for a rifle exhibiting between 60%-90% of its original finish and a good bore.
You need the services of a professional appraiser
700-1000
The M69 suffix identifies your 300 win mag as being a browning BAR that was made in 1969.
Best to ask a gunsmith for assistance.