Typically see the first fawns around the 15th to 20th of May. That'd put the first breeding around the 15-20th of Sept, giving 235 plus a few days for the hiding phase. Rutting activity will start well before that.
Hardly, I gotta learn how to kill those big ones like you.
You can get some pretty aggressive actions earlier than the 15th or so, but they generally lose their minds after that. However, often times bucks (and does too) are so used to seeing decoys that they can get a little shy. Decoying is as much about tricking the does as it is the bucks.