I like 10 grains per pound as a benchmark. 9 seems to be great when using my bows around 60#'s for speed and accuracy, it is noiser. 11gpp seems great with my 50# bows. I don't know if there is a one setup best answer when you maybe after rabbit, hogs, deer, elk, or buffalo. I love my 730gr setup which is 25% foc, seems like it would penetrate anything well with a razor sharp broadhead. I probably wouldn't use that setup on rabbits, but I could. That setup is whisper quiet, I love that setup!