thirty-thirty

noun
thir·​ty-thir·​ty | \ˌthər-tē-ˈthər-tē \

Definition of thirty-thirty 

: a rifle that fires a .30 caliber cartridge having a 30 grain powder charge usually written .30–30

First Known Use of thirty-thirty

1929, in the meaning defined above

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The first known use of thirty-thirty was in 1929

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