Maybe that's where the name for the gun called a "30-aught-6" comes from. .30 caliber, invented in 1906. That's just a guess, though.
Yes, that's correct. The gun (or cartridge, more correctly) is still referred to alternately as ".30 '06".
There's an episode of the Simpsons where Bart breaks into turn of the century gold-prospector speech. If I remember he utilizes the "aught" as "0" in character.
Anyway, carry on.
Aric