I just got myself a grain scale and in my excitment of wanting to try it out, set out weighing items in my archery arsenal. I always had a fairly good idea what my finished arrows weighed, but never knew for sure. It turns out my guess was pretty good. The next thing I set out to weigh was field tips and broadheads. The field tips weighed out fairly good, with only a 1 grain +/- difference from the weight they were supposed to be. The broadheads were another story. For the replaceble blade heads I weighed (Rocky TI 100s and Ironhead 125s), I weighed each ferule with the same set of blades and washers. I recorded a +3/-2 grain variation from the stated weight for these two brands of heads. Thats a difference of 5 grains between the heaviest and lightest heads of each type! I also put some complete 125 grain Rocket Steelheads on the scale and had simular results. This got me thinking, if itty bitty broadheads are this bad, how bad are my arrows? To my relief, my ICS Hunter shafts (with nocks and inserts) only had slightly more than a 1 grain total deviation between the 8 that I weighed. This leaves me with two questions. If carbon arrows can be manufactured with such good weight tolerances, why can't something as simple as a broadhead weigh what its supposed to? Secondly, and more important, how much weight deviation in a broadhead tipped arrow does it take to start seeing a difference in your groups at hunting distances (let's say 40 yrds or less)?