Is limiting my caloric intake to 1300 a day with an extremely active lifestyle crazy?

I’ve been working out fairly heavily for months and months now. I had wanted to lose about 15 lbs but what I’ve been finding is that the more I exercise the more my weight stays the same even though I’m losing inches. I think I’m just replacing fat with muscle.

I had signed up for a calorie counter and set a goal weight for August and then very soon after forgot about it. I just started using it again and because August is not that far away it set my maximum caloric intake at 1300 calories.

So my question is this: is 1300 calories a day reasonable for an active lifestyle? The last thing I want is to burn out because I’m not taking in enough food.

I also realize that if I start feeling faint I can always eat a bit more.