Regardless of what you hear, you DONT get an interview with an airline at 300 hours. That is the BARE MINIMUM hours that your going to get to go all the way thru the training.
Once you have finished all your training, you then must work as an instructor at the school until you get between 1000 (for Airnet) and between 1200-1500 hours to get an interview at a regional airline. Period, no exception. And I know of an instructor that works there that only logged 250 hours last year, so dont think it's going to be an overnight occurence either!