ive only ran one bow thru a chrono(the 1st i ever made)
it was 3 times the draw weight
but i much prefer to shoot them and check distance/cast over "how fast" some techie piece of equipment says it is
after all that speed is directly off the bow and not how fast it moving when it hits its target down range
i to like doing the distnace/cast check over chrono for the same reason that okie mentioned
its "primitive",well that and i am too damn cheap to go buy a chrono or spend money to use the one at the local "pay range"