Greetings Greg!
I picked some AD Hammerheads up for my son last fall, but of course, I had to shoot them out of all my longbows (41#, 45#, 56#, 60#, and 63#) as well to see how they flew.
The fortunate thing was that with 3 x 5" fletch and using 100 gr brass inserts they flew perfect (cut to 29") - like darts - out of both of our 55# longbows. The graphite arrows had much faster recovery than the hard wood shafts I like to use for hunting.
I still choose to shoot wood, but the AD hammerheads would make a good alternative if I needed one.
Good luck!