wildcatter ‎(plural wildcatters)

  1. (US) Someone who drills for oil speculatively
  2. A worker who participates in a wildcat strike
  3. (firearms) A person who makes wildcat ammunition and the guns that use them.
    • (Can we date this quote?) “Ammunition”, in Weatherby[1], archived from the original on 15 February 2005:
      Roy Weatherby began his career in the firearms industry as a “wildcatter”, developing his revolutionary ideas about rifle cartridge performance and design.