As with any firearm, it is not possible to accurately appraise a gun without seeing it. Condition, and original configuration will determine value. Other factors such as rarity of caliber or guage and higher grades have significant impact on value. 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.
You need the services of a professional appraiser
How value is Browning 300 Win Mag Semi Automatic
A Browning BAR grade IV rifle which was discontinued in 1984 will bring between 915-1,775 dollars for a rifle showing between 60%-90% of it,s original finish remaining and a good bore.
one thousand us dollars
It sounds like you have a Mauser made Browning in Safari Grade. The "P" at the end of the serial number is an unknown character. Value depends on condition. Use the blue book link for values
50-500 usd
Around 1500
Need a detailed description
-80-800 usd
100-1000 USD depending on specifics
500-800
Only browning customer service would be able to provide you with that number.