A browning safari grade rifle in a standard caliber,and the condition you describe is valued at 995-1,100 dollars.
50-750 usd
Yes
200-500 USD depending on condition.
500-800
your browning safari was made in 1969.
your browning safari bolt action was made in 1969.
The "rate of twist on rifling" is caliber specific. To give you an answer we would need to know which cartridge the rifle is chambered for.
Your 1993 produced browning Bar II Safari is going for between 325-625 dollars depending on the condition of the original finish on the wood and metal.
A Browning safari grade bolt action rifle in the excellent condition you describe will bring between 1,375-1,500 dollars for a gun with between 90%-95% overall condition,and a good bore. There were not many of these rifles chambered for the .308 Norma Magnum caliber.
You did not provide a detailed description of the weapon, its features, finish, condition, box, papers, any accessories, barrel length, sights, etc.. The best I can do is a genearl price range. You might be in the 300-1000 USD range, give or take.
The prefix of L70 indicates that your Browning safari bolt action rifle was made in the year 1970.
With the 5L prefix to your serial number indicates that your Browning model safari bolt action rifle was produced by FN of belguim for Browning in 1965.