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.
100-1000 USD depending on specifics
Browning does not make a M70 semi auto 7mm nag
50-550 usd
1993; 200-650 USD
50-550 usd
100-1000 and up depending on specifics
1966.
100-400 USD
100-1000 + USD depending on specifics.
350-650 dollars,depending on overall condition and a good bore.
Made in 2002. Value range 300-700 USD.
I believe it was from 1962 onward.