Depending on how I setup the bow and what venue,loop and release etc,I am between 28 and 28 1/2".I have even shot 28 3/4" with a long a-a bow and a really short release and loop for some indoor 3-d and it was PERFECT.
I am shooting my bow right now on 28" but my loop is 7/8" to the string from the inside of the loop.I do that for anchors for my current bt release.
