Browning's web site has the current information.
The Browning web site has a search function that will assist you.
These are the different widths needed for ranges. the more notches (range from 1-5 notches) the wider the pattern of BBs
# They relate to choke type, i.e., full, modified....
Weatherby was created in 1940.
Based on an exhaustive Google search, I don't believe so. They did make a .257 Roberts, at least in 1942, and it is rare. Sometimes these were reamed out later by gunsmiths to .257 Weatherby Magnum, and the barrel markings may or may not have been changed.
Jager Weatherby's birth name is Elizabeth Jager Munson Weatherby.
Roy Weatherby died on 1988-04-04.
You will have to check the Weatherby Catalog
Jager Weatherby is 5' 5".
Dennis Weatherby was born in 1959.
John Weatherby died in 1948.