One other small point. Your arrows will also be a couple inches shorter than your friend's, so they could be 15 grains or so lighter. Maybe even more if your arrowsare a spine class under his. That would add another couple of fps to your projected arrow speed.

Lots of folks think us guys with extra long draw lengths can really crank out the speed. But what they don't realize is our longer arrows are longer (more weight)and also have to be spined stiffer, which makes them muchheavier.

For instance, I don't cut arrows to length because the raw shafts are already to the length I need (a few mfr's don't make shafts long enough for my arrows). I just glue an insert in a raw shaft and stick the nock in the other, fletch it up and that's my arrow.The 'light' arrows I used with my 60 lb compound were7595 Gold Tip XT's, and they weighed around 450 grains.