Wildcatter

Full definition of wildcatter

Noun

1. (US) Someone who drills for oil speculatively
2. A worker who participates in a wildcat strike
3. (firearms) 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.http://www.weatherby.com/products/ammunition.asp