Just a FYI, gpi = grains per inch, or the weight of 1” of shaft, which for a carbon arrow will generally be in the range of 6-8 gpi. I think you mean gpp, which is grains per pound, which is the weight of the arrow divided by the pounds pull at your draw weight. Your calculated amounts are between 11-12 gpp, which would be in the range of what many hunters would like. I prefer 9-10 gpp for hunting, but I am old fashioned.
You are probably using 3 pounds per inch to calculate your actual draw weight compared with the marked weight on the bow (unless you are actually measuring your draw weight). I have found that 3 pounds per inch is more appropriate for higher poundage bows. I think your weight loss would be more like 2 pounds per inch, so your actual draw weight may be higher than you calculated.
Your arrow velocities are in the ballpark of what I would expect to see from your setup. Obviously, if you chose to use arrows in the 10 gpp range, your velocity would increase. Many people hunt with bows pulling 40# or more at their draw weight. I would consider 36# to be marginal, although your actual draw weight may be a little higher than that.
Topic: Tech numbers (Read 719 times)
