That's what I'm shooting from a 45# Martin X-200 at 28", thanks to Art, who beat me to it again
Bought mine at walmart, they're 29" from nock valley to insert, tipped with 125 grain wensel woodsmans glue on a 125 grain steel adapter. I stripped the vanes and fletched with 5.5" traditional barred HP parabolics.
I'm getting great flight from this combo.