50-350 USD or so
No such weapon exists. Ruger made a GP 100, but Beretta never did.
The GP100 is a great revolver, but if you're backpacking in Alaska - where you could be subject to encountering bear - you would definitely much rather have the .454 Casull.
Depending on condition, $400-$475.
100-1000 USD or more depending on specifics
100-1000 or so depending on EXACTLY what you have.
$300-$375, depending on exact version and condition
Between 275-550 dollars,depending on overall condition and a good bore.
Value depends upon condition. POOR approx $150 to EXCELLENT $450+.
Can't be answered without a detailed description of all markings, papers,box, accessories, condition
it is worth ..............$$$$
Unknown caliber. Contact Ruger
350 USD