All true. I believe, but am not 100% sure that Excals site, possibly 10 pts and for sure the Italian site linked on another thread all have tables to determine this. IMHO, if you have a bunch to begin w/ it all comes out good down range. It seems most compounds need an arrow weight above 415 gr, and w/ fps in the 280-300 plus range, we would have enough k.e. out to at least 50 yds. Which is a little too far for white tail for me, but the k.e. is there.