.257 Roberts
.257 Roberts is a cartridge or ammunition model.
Overview
Rifle cartridge.
In detail
It is associated with United States.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“.257 Roberts”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4545217: .257 Roberts
Consult the source