Give the man a seegar!! Right you are, of course. Around 2000, the Navy developed and put into use a 5"/62 caliber gun.

This is something most always a sure bet to win you a beer - most will guess something like the big guns on a battleship, but those were (generally) 16"/50 caliber - and there is the winner - naval guns are measured by bore size (in this case, 16") AND the length of the barrel, as expressed in the equivalent of the bore size (in this case of the 16" gun, the barrel is 50 times the diameter of the bore - hence the "50 caliber"). Since the bet was the "biggest caliber", the 5'/54 was a larger "caliber". (Be prepared to fight for that beer!)
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