You can get a manual for free on Browning's web site.
50-200 usd
This should be a Nomad model made in 1962. Not a Buckmark although similar
50-200
50-200 usd
Never made in Belguim
50-200 USD depending on specifics
The Browning Buckmark is a very well made, durable, reliable handgun. I am personally partial to Rugers and Colts, but also like the Brownings.
Micro
The Buckmark is a newer version of the same design. Challengers came in 3 models or versions (I, II, III), each being made after the former was discontinued. The Challenger III was very very close to the current Buckmark design, with the aluminum frame in common with the Buckmark. Challenger I and II both had steel frames.
Made in the U.S.A.
contact customer service at browning.com
Weapons will exhibit a preference for one or more loads. The only way to find out is to shoot as many different types/loads as you can afford.