Those are NORMAL numbers. Remember, there are 50 states, and approximately 10,000 applicants for the air force and I believe about 14,000 applicants for Navy. If all states were about the same size, that would be 200-300 applicants from each state. Obviously, higher populated states and more "Military Friendly" states are going to have more. But that 200-300 applicants; or even 600, is generally State-Wide. You could have maybe only 10-20 in your district for your representative to sort through. There are some mega-states like California that has around 500 applicants; YET, I remember 3 or 4 years ago, an individual in the berkley california area; "Not sure which district"; said that his representative said he was the ONLY person applying to the air force academy from that district. Apparently, not too many individuals interested in the military from that area. Then there's states like Wyoming, that only have 550,000 people in the entire state, but they only have 1 representative/district. And there's generally around 15-20 interested applicants. But because there's 2 senators also, they have a pretty good chance of getting a nomination. "But the MOC's are pretty picky to make sure you deserve to be at the academy".
So don't worry about the 300 as much as if you can find out how many are from your district. Either way, 300 in a state is about average. Best of luck. Mike....