GREATLY depends on condition (condition and condition) anywhere from $100-$800 for like new in the box.
There is no Remington Model 6 pistol, there has been however cases however of Remington Model 6 rifles converted to pistols by gun or "home" smiths. NOT Remington. As such the value is whatever someone will pay, but generally not much.
what model pistol ????
Impossible to answer without knowing name of manufacturer.
about 350 or so
25-100
100-300 USD
100-300 USD
Model 58 is an automatic not a bolt action
50-400
50-100 USD
100-300 USD or so
Depending on condition the blue book value is between $250 and $800