I just moved up a little in bow weight to 53@28" (I pull right at 28") from 43 - 45#'s and have been working on a couple of different arrows. The first is an Axis Traditional with a 75 grain insert and 125 grain tip. The approx. numbers according to Stu's are as follows: TW 528gn, 10gpp, 16.8% foc, 182.5 fps, ke 39.0. The second is a CE Piledriver with 50 grain insert and 200 grain tip. The approx. numbers according to Stu's are as follows: TW 594gn, 11.2gpp, 17.8% foc, 172.5 fps, ke 39.2. I still have a little fine tuning to do, but both are flying well. I know conventional wisdom / thinking / science says the heavier arrow will provide better penetration all other things being "equal". However, I seem to get as good, if not better, penetration on my targets with the smaller diameter Axis. I suspect performance on a foam target is going to be different than on the shield of a boar though. Would like some opinions from those who know. I may eventually go to a heavier spined Axis so that I can have the best of both worlds, but until I can do that, which one do you think would be my best bet at getting sufficient penetration for a quick humane kill? This all assuming I do my part and put it where it needs to be. I was planning to shoot 2 blade heads from both set ups.