dirty harry's gun is a 44magnum
10 Gallons in a Cowboy Hat
4 g in a cc is a ditloid, a type of word puzzle, each letter in the ditloid is the beginning of a word , you have the work it out, in this case the answer is Four Ghosts in a Christmas Carol.
9 Months in a Human's Gestation Period
4 Ghosts in a Christmas Carol (Charles Dickens)
"Fourteen is the Maximum Number of Clubs Allowed for a Golfer" (to be used in a single round, that is).
Four roads to Glenamaddy
Fifth-Generation Language
This is a ditloid. The answer is 9 = gallons in a firkin.
0 degrees longitude at Greenwich
Two 'O's in Google and Yahoo!
8 = Pints in a Gallon
6 Dogs in a Greyhound Race.