The term “sniper” to describe professional sharpshooters originates in colonial India. British soldiers stationed there found it very challenging to hunt the snipe, a well-camouflaged wading bird which flies in unpredictable patterns. Hence the term “sniper” came to indicate shooters skilled in the marksmanship and camouflaging needed for a successful snipe hunt.
Shotguns typically spray pellets rather than firing a single bullet, so taking a “shotgun approach” alludes to a broad-based “see what hits” strategy instead of a focused one.
No reputable casino will let you play “Russian roulette,” a term that denotes taking a chance with a deadly risk. This terrifying “game” involves putting a single bullet into the cylinder of a revolver, which is then spun (like a roulette wheel) to lose track of the bullet before pointing the gun at one’s own head or another’s. If the cylinder holds six bullets, there is a 1/6 chance of firing the bullet when the trigger is pulled.