wildcatter

listen to the pronunciation of wildcatter
English - English
Someone who drills for oil speculatively
A worker who participates in a wildcat strike
person who makes wildcat ammunition and the guns that use them

Roy Weatherby began his career in the firearms industry as a “wildcatter”, developing his revolutionary ideas about rifle cartridge performance and design.

{i} person who hunts for oil (Slang); promoter of risky enterprises, person who takes risks (e.g. in business)
an oilman who drills exploratory wells in territory not known to be an oil field
wildcatters
plural of wildcatter